Dialictus atlanticus Mitchell, 1960: 383
Dialictus atlanticus
Lasioglossum ( Dialictus ) atlanticum
Dialictus atlanticus
Dialictus atlanticus
Revision of the metallic species of Lasioglossum (Dialictus) in Canada (Hymenoptera, Halictidae, Halictini) 2591
Gibbs, Jason
Zootaxa
2010
2010-08-31
2591
1
1
382
Gibbs
Gibbs
[151,649,1111,1137]
Insecta
Halictidae
Lasioglossum
Animalia
Hymenoptera
193
194
Arthropoda
species
mitchelli
Dialictus
( Figures 146A–C, 147A–H)
Dialictus atlanticus Mitchell, 1960: 383. ♀. (Preocc. Cockerell 1938b) Holotype. ♀ USA, North Carolina, Raleigh, 5.viii.1957(Mitchell); [NCSU]. Examined. Taxonomy. Knerer and Atwood, 1966a: Dialictus atlanticus ♂, p. 881; Krombein, 1967: Lasioglossum( Dialictus) atlanticum, p. 462 (catalogue); Hurd, 1979: Dialictus atlanticus, p. 1964 (catalogue); Moure & Hurd, 1987: Dialictus atlanticus, p. 91 (catalogue).
Diagnosis.Females of L. mitchellican be recognised by the shape of the clypeus which has subparallel apicolateral margins, acute apicolateral angles and a broad, straight distal margin. They may be further distinguished by the round head (length/width ratio = 0.90–0.94), tessellate mesoscutum with moderately dense punctures on the central disc (i=1–1.5d), rugulose mesepisternum, pale tegula, and complete T1 acarinarial fan. They are most similar to L. weemsiwhich have a dorsal opening on the T1 fan. Lasioglossum mitchelliis also similar to some members of the L. viridatumspecies-group such as L. admirandumand L. paradmirandum. Females of the L. viridatumspecies-group have the clypeus distinctly convergent towards the apex and a distinct dorsal opening of the acarinarial fan. Males of L. mitchelliare similar to females but have a more elongate head length/width ratio = 0.98–1.00) and may be further distinguished by the elongate flagellomeres (length/width ratio = 1.73–1.90), brownish yellow tarsi and tibial apices, weakly carinate posterior margin of the metapostnotum, and impunctate apical impressed areas of the metasomal terga. Males are most similar to L. versatumand L. paradmirandum.Male L. versatumhave distinct punctures on the apical impressed areas of the metasomal terga. Male L. paradmirandumhave the posterior margin of the metapostnotum rounded.
Redescription.FEMALE. Length 4.70–5.67 mm; head length 1.22–1.54 mm; head width 1.30–1.63 mm; forewing length 3.42–4.03 mm. Colouration.Head and mesosoma green with faint bluish reflections to mostly blue. Clypeus with apical half blackish brown. Antenna dark brown, flagellum with ventral surface ruddy. Mesoscutum sometimes with brassy reflections. Tegula amber to reddish. Wing membrane subhyaline, venation and pterostigma brownish yellow. Legs brown, tarsi reddish brown to amber. Metasoma dark brown, terga and sterna with apical margins translucent brownish yellow. Pubescence.Dull white. Moderately sparse. Head and mesosoma with moderately sparse woolly hairs (1– 2 OD), longest on genal beard, metanotum and mesopleuron (2–2.5 OD). Paraocular area with moderately sparse tomentum, partially obscuring surface. Gena with sparse tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with moderately sparse, fine setae. T1 acarinarial fan complete. T3–T4 basolaterally and T5 entirely with sparse tomentum. T2 apicolateral and T3–T4 apical margins with sparse fringes. Surface sculpture.Face imbricate, punctation fine. Clypeus with apical half polished, punctation sparse (i=1–3d). Supraclypeal area with punctation moderately sparse (i=1–2.5d). Lower paraocular area punctation dense (i≤d). Antennocular area punctation moderately dense (i=1–1.5d). Upper paraocular area and frons punctate-reticulate. Ocellocular area obscurely punctate (i=d). Gena lineolate. Postgena imbricate. Mesoscutum tessellate, punctation moderately dense between parapsidal lines (i=1–1.5d), dense laterad of parapsidal lines (i≤d), contiguous on anterolateral portion. Mesoscutellum similar to mesoscutum, submedial punctation sparse (i=2–5d). Axilla minutely punctate. Metanotum imbricate. Preëpisternum rugose. Hypoepimeral area strongly imbricate. Mesepisternum dorsal half rugulose, ventral half ruguloso-imbricate. Metepisternum with dorsal two-fifths striate and ventral portion imbricate. Metapostnotum incompletely striate, posterior margin imbricate. Propodeum with dorsolateral slope rugulose, lateral surface tessellate-imbricate, posterior surface tessellate. Metasomal terga faintly coriarious, punctation uniformly spaced on disc (i=1–1.5d) except apical impressed area nearly impunctate. Structure.Head very wide (length/width ratio = 0.90–0.94). Eyes convergent below (UOD/LOD ratio = 1.24–1.33). Clypeus ½ below suborbital tangent, apicolateral angle subparallel. Antennal sockets close (IAD/ OAD <0.5). Frontal line carinate, ending 2 OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 3–4 teeth. Metapostnotum truncate (MMR ratio = 1.21–1.35), posterior margin weakly angled onto posterior surface. Propodeum with oblique carina absent, lateral carina not reaching dorsal margin. MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 4.03– 4.70 mm; head length 1.27–1.34 mm; head width 1.30–1.37 mm; forewing length 3.36–3.48 mm Colouration. Labrum, mandible, flagellum ventral surface, tibial bases and apices, and tarsi yellow to brownish yellow. Pubescence. Lower paraocular area with appressed tomentum obscuring surface. Clypeus, and supraclypeal area with sparse tomentum not obscuring surface. S3–S4 apicolateral portions with moderately dense tufts (1–1.5 OD). Surface sculpture. Mesoscutum densely imbricate. Metanotum rugulose. Metapostnotum coarsely, longitudinally striate. Propodeum with dorsolateral slope rugose. Metasomal terga with apical impressed area impunctate. Structure.Head round (length/width ratio = 0.98–1.00). Eyes strongly convergent below (UOD/LOD ratio = 1.55–1.57). Antennal sockets distant (IAD/OAD> 1.6). Frontal line carinate, ending 2 OD below median ocellus. Pedicel shorter than, or subequal to, F1. F2 length 1.9–2.0X F1. F2–F10 elongate (length/width ratio = 1.73–1.90). Metapostnotum truncate (MMR ratio = 1.20–1.50), posterior margin sharply angled onto posterior surface. Terminalia. S7 with median lobe clavate, sides concave, apex rounded ( Fig. 147G). S8 with apicomedial margin weakly convex ( Fig. 147G). Genitalia as in Fig. 147E–F. Gonobase with ventral arms widely separated. Gonostylus small, dorsal setae elongate. Retrorse lobes elongate, narrow, weakly attenuated apically. FIGURE 147. Lasioglossum mitchelliGibbs.Male (A) lateral habitus; (B) dorsal habitus; (C) face; (D) metapostnotum; (E) ventral view of genital capsule; (F) dorsal view of genital capsule; (G) S7, S8; (H) metasomal terga. Scale bars, A–C = 1 mm, G = 0.5 mm. Range.Ontario south to Georgia, west to Kansas ( Fig. 143). Additional material examined. CANADA: ONTARIO: 2♀ Iona, 17.ix.1963, on Solidago, (G. Knerer); 1♂, Iona, 15.ix.1963( G. Knerer); 2♀ Iona, 25.v.1962( G. Knerer); 1♀ Ipperwash, 25.v.1962( G. Knerer); [ ROM]; 1♀ Ojibway Park, nr. Windsor, 24.viii.1982( M. Sharkey); [ PMAE]; [ PCYU]; USA: ILLINOIS: 8♀ Carlinville, N39.1365 W089.9419, 24.vi.2006( J. Gibbs); 3♀ Carlinville, N39.2787 W089.7961, 25.vi.2006( J. Gibbs); 5♀ Carlinville, N39.3018 W089.7886, 26.vi.2006( J. Gibbs); 3♀ E of Carlinville, N39.2596 W089.5485, 25.vi.2006(J. Gibbs); 2♀ Litchfield, N39.1484 W089.66696, 25.vi.2006( Gibbs& Sheffield); 1♀ Macoupin Co., E of Carlinville, N39.27869 W089.7961, 25.vi.2006( C. Sheffield); 1♀ Montgomery Co., N39.25962 W089.54851, 25.vi.2006( Gibbs& Sheffield); [ PCYU]; IOWA: 1♀ Mahaska Co., Oskaloosa, 21.viii.1964(A. R. Moldenke); [ AMNH]; KANSAS: 1♂ Douglas Co., Coyler Prairie, N38°49.168´ W095°21.788´, 11.vii.2004( J. Hopwood); 1♀ Douglas Co., Coyler Prairie, N38°49.168´ W095°21.788´, 28.vii.2004( J. Hopwood); MARYLAND: 1♀ 3.ix.2003( S.W. Droege); 1♀ Frederic Co., Creagerstown Park, Hwy550 & Monocacy River, N39.6153 W077.3506, 10.vi.2006( J. Gibbs); 1♀ Montgomery Co., N38.97 W077.1565, 24.vi.2006( S.W. Droege); MICHIGAN: 1♀ Olivet, N42.4129 W084.9386, 27.vi.2006( J. Gibbs); NEW YORK: 3♀ Tompkins Co., Bakers, N Lansing, 15.v.2009( B.N. Danforth); [ CUIC]; NORTH CAROLINA: 1♀ Great Smoky Mtn.N.P., Cataloochee, N35.62813 W083.09997, 6.viii.2006( J. Gibbs); [ GSNP]; 1♂ Hwy24/27, E of Charlotte, N35.24474 W080.53715, 10.viii.2006( C. Sheffield); 1♀ Mechlinburg Co., Huntersville, 8.vii2006( M.F. Veit); SOUTH CAROLINA: 1♀ Okanee Co., nr Walhalla, N34.81283 W083.13679, 9.viii.2006( J. Gibbs); [ PCYU]; TENNESSEE: 6♀ Great Smoky Mtn. N.P., Cades Cove, Hyatt Rdat Abhram’s Creek, 5.viii.2006(J. Gibbs); [ GSNP]; TEXAS: 1♀ Bastrop Co., Stengl Biological Stn., 6 miN of Smithville, 12.v.2000( J. Abbott& R. Caesar); [ PCYU]; 1♀ Bastrop Co., Stengl Biological Stn., N30.087 W091.173, 5.v.2005( A.W. Hook); [ CTMI]; VIRGINIA: 1♀ Albemarle Co., N37.8479 W078.6679, 14.iv.2003( T. Olivier); 2♀ AssateagueI., N37.9144 W075.3379, 30.vi–1.vii.2006( S.W. Droege); WEST VIRGINIA: 1♂ Hampshire Co., N39.3353 W078.456, 17.ix.2005( S.W. Droege); [ PCYU]; WISCONSIN: 1♀ Dane Co., Westport Drumlin, 11.vii.1996( R. A. Henderson); [ IRCW]. Floral records. APIACEAE: Eryngium yuccifolium, APOCYNACEAE: Apocynum cannabinum, ASTERACEAE: Cichorium, Solidago, Taraxacum officinale, Vernonia, BRASSICACEAE: Barbarea vulgaris, FABACEAE: Amorpha canescens, A. fruticosa, Dalea purpurea, Glycine max, Melilotus officinalis, RANUNCULACEAE: Ranunculus abortivus.
Etymology.The specific epithet is named in honour of Theodore B. Mitchell.
Comments.Rare in Canada. Abundant in the Eastern USA. It has sometimes been mistaken in collections for L. admirandum. Lasioglossum interruptum(Panzer)is a subjective senior synonym of Halictus interruptus atlanticusCockerell.The name Lasioglossum atlanticum(Mitchell), used in the past, is unavailable due to secondary homonymy ( Ebmer 1976).
[586,1432,191,218]
1963-09-17
Canada
Iona
197
198
2
2
Ontario
[151,549,232,258]
1963-09-15
G. Knerer
Canada
Iona
197
198
1
1
Ontario
[564,965,232,258]
1962-05-25
G. Knerer
Canada
Iona
197
198
2
2
Ontario
1962-05-25
ROM
G. Knerer
Canada
Ipperwash
197
198
1
1
Ontario
[252,1156,272,298]
1982-08-24
PMAE, PCYU
M. Sharkey
Canada
Windsor
Ojibway Park
197
198
1
1
Ontario
2006-06-24
J. Gibbs
United States of America
39.1365
Carlinville
6
-89.9419
197
198
8
8
Illinois
2006-06-25
J. Gibbs
United States of America
39.2787
Carlinville
6
-89.7961
197
198
3
3
Illinois
[288,1034,352,378]
2006-06-26
J. Gibbs
United States of America
39.3018
Carlinville
6
-89.7886
197
198
5
5
Illinois
2006-06-25
Gibbs
United States of America
39.2596
E of Carlinville
6
-89.5485
197
198
3
3
Illinois
[571,1432,392,418]
2006-06-25
Gibbs & Sheffield
United States of America
39.1484
Litchfield
5
-89.66696
197
198
2
2
Illinois
[151,1170,432,458]
2006-06-25
C. Sheffield
United States of America
Macoupin Co.
39.27869
E of Carlinville
4
-89.7961
197
198
1
1
Illinois
2006-06-25
PCYU
Gibbs & Sheffield
United States of America
Montgomery Co.
39.25962
Montgomery Co.
1
-89.54851
197
198
1
1
Illinois
1964-08-21
R, AMNH
Moldenke
United States of America
Mahaska Co.
Oskaloosa
197
198
1
1
Iowa
2004-07-11
J. Hopwood
United States of America
Douglas Co.
38.819466
Coyler Prairie
1
-95.36314
197
198
1
1
Kansas
2004-07-28
J. Hopwood
United States of America
Douglas Co.
38.819466
Coyler Prairie
1
-95.36314
197
198
1
1
Kansas
[470,987,592,618]
2003-09-03
S. W. Droege
United States of America
MARYLAND
197
198
1
1
Maryland
2006-06-10
J. Gibbs
United States of America
Frederic Co.
39.6153
Hwy
6
-77.3506
Creagerstown Park
197
198
1
1
Maryland
2006-06-24
S. W. Droege
United States of America
Montgomery Co.
38.97
Montgomery Co.
555
-77.1565
197
198
1
1
Maryland
2006-06-27
J. Gibbs
United States of America
42.4129
Olivet
6
-84.9386
197
198
1
1
Michigan
[247,1323,712,738]
2009-05-15
CUIC
N Lansing & B. N. Danforth
United States of America
Tompkins Co.
Bakers
197
198
3
3
New York
2006-08-06
GSNP
J. Gibbs
United States of America
35.62813
Cataloochee
1
-83.09997
Great Smoky Mtn.
197
198
1
1
North Carolina
[260,1239,792,818]
2006-08-10
C. Sheffield
United States of America
35.24474
Hwy
1
-80.53715
197
198
1
1
North Carolina
2006-07-08
M. F. Veit
United States of America
Mechlinburg Co.
Huntersville
197
198
1
1
North Carolina
2006-08-09
PCYU
J. Gibbs
United States of America
Okanee Co.
34.81283
Walhalla
1
-83.13679
197
198
1
1
South Carolina
2006-08-05
GSNP
Great Smoky Mtn. N. P. & Gibbs
United States of America
Cades Cove
Abhram's Creek
Hyatt Rd
197
198
6
6
Tennessee
2000-05-12
R, PCYU
J. Abbott & Caesar
United States of America
Bastrop Co.
Stengl Biological Stn.
197
198
1
1
Texas
2005-05-05
CTMI
A. W. Hook
United States of America
Bastrop Co.
30.087
Stengl Biological Stn.
73
-91.173
197
198
1
1
Texas
2003-04-14
T
Olivier
United States of America
Albemarle Co.
37.8479
Albemarle Co.
6
-78.6679
197
198
1
1
Virginia
[438,1341,1032,1058]
2006-06-30
2006-07-01
2006-06-30
S. W. Droege
United States of America
37.9144
Assateague
6
-75.3379
197
198
2
2
Virginia
2005-09-17
PCYU
S. W. Droege
United States of America
Hampshire Co.
39.3353
Hampshire Co.
43
-78.456
197
198
1
1
West Virginia
1996-07-11
R, IRCW
A. Henderson
United States of America
Dane Co.
Westport Drumlin
197
198
1
1
Wisconsin