Halictus ( Chloralictus ) pacatus Sandhouse, 1924: 16 Lasioglossum ( Chloralictus ) pacatum Dialictus pacatus Dialictus pacatus 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 6P2FK (Sandhouse) Sandhouse 1924 [151,726,751,777] Insecta Halictidae Lasioglossum Animalia Hymenoptera 227 228 Arthropoda species pacatum Dialictus  ( Figure 166A–D)      Halictus( Chloralictus) pacatus  Sandhouse, 1924: 16. ♀.  Holotype. ♀ USA, Colorado, Peaceful Valley, 1919, (Cockerell), [NMNH: 26407]. Examined.  Taxonomy. Michener, 1951:  Lasioglossum( Chloralictus) pacatum, p. 1116 (catalogue); Hurd, 1979:  Dialictus pacatus, p. 1969 (catalogue); Moure & Hurd, 1987:  Dialictus pacatus, p. 119 (catalogue).   Diagnosis.Females of  L. pacatumcan be recognised by the diagnostic combination of a relatively large size ( 5.1–6.4 mm), green head and mesosoma, round to relatively elongate head (length/width ratio = 0.96– 1.01), lower face distinctly smooth, gena narrower than eye, mesoscutal punctures moderately sparse on central disc (i=1–2d), rugulose mesepisternum, metapostnotum with longitudinal rugae not reaching posterior margin, propodeum oblique carina virtually absent, dark brown metasomal terga polished due to lack of microsculpture, T1 acarinarial fan strong but with dorsal opening, T2 basolaterally and T3–T5 entirely with moderately dense tomentum, and T3–T4 with weak apical fringes. They are similar to  L. laevissimum,  L. marinense,  L. ephialtumand  L. viridatulum(Cockerell). Female  L. laevissimumhave a wide head (length/ width ratio = 0.89–0.95) and a gena wider than the eye. Female  L. marinensehave virtually no tomentum on the metasomal terga and a very weak T1 acarinarial fan that is present only as two small lateral hair patches. Female  L. ephialtumhave the metapostnotum completely rugoso-striate and moderately strong fringes on the metasomal terga. Female  L. viridatulumhave the lower portion of the face less smooth with distinct lines on the apical half of the clypeus. Male unknown.   Redescription.FEMALE. Length 5.06–6.35 mm; head length 1.54–1.75 mm; head width 1.52–1.78 mm; forewing length 3.97–4.70 mm.  Colouration.Head and mesosoma greenish blue. Clypeus with apical half blackish brown and basal half, and supraclypeal area more greenish or bronze. Antenna dark brown, flagellum with ventral surface orangebrownish yellow. Tegula reddish brown. Wing membrane subhyaline, venation and pterostigma amber. Legs brown, medio- and distitarsi and sometimes metabasitarsus base brownish yellow. Metasomal blackish brown, terga and sterna with apical margins reddish brown.  Pubescence.Dull white. Sparse. Head and mesosoma with moderately dense woolly hairs (1–1.5 OD), longest on genal beard, metanotum and mesopleuron (2–2.5 OD). Lower paraocular area and gena without subappressed 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 incomplete, dorsal open ing equal in width to lateral appressed hairs. T2 basal portion and T3 basal margin with appressed tomentum. T4 with sparse tomentum partially obscuring surface. T2 apicolateral and T3–T4 apical margins with sparse fringes.   FIGURE 166.  Lasioglossum pacatum(Sandhouse). Female (A) lateral habitus; (B) dorsal habitus; (C) face. Scale bars, A–C = 1 mm.  Surface sculpture.Face imbricate, punctation moderately fine. Clypeus with apical half polished, punctation unevenly spaced (i=1–3d). Supraclypeal area with punctation moderately sparse (i=1–2d). 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 imbricate, punctation moderately fine, moderately sparse between parapsidal lines (i=1–2d), dense laterad of parapsidal lines (i≤d), contiguous on anterolateral portions (i≤d). Mesoscutellum similar to mesoscutum, submedial punctation moderately sparse (i=1.5–2.5d). Axilla punctate. Metanotum imbricate. Preëpisternum rugulose. Hypoepimeral area imbricate. Mesepisternum dorsal half weakly rugulose, ventral half imbricate. Metepisternum with dorsal half rugoso-striate, ventral half imbricate. Metapostnotum incompletely rugoso-striate, posterior margin imbricate. Propodeum with dorsolateral slope rugulose, lateral surface imbricate-rugulose, posterior surface imbricate. Metasomal terga weakly coriarious, punctation on basal halves moderately sparse (i=1–3d), apical half impunctate except along premarginal line and a few scattered punctures on marginal zone.  Structure. Head wide to round (length/width ratio = 0.96–1.01). Eyes convergent below (UOD/LOD ratio = 1.18–1.22). Clypeus 2/3 below suborbital tangent, apicolateral margins strongly convergent. Antennal sockets close (IAD/OAD <0.5). Frontal line carinate, ending <2.5 OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 3–5 teeth. Metapostnotum moderately elongate (MMR ratio = 1.19– 1.33), posterior margin rounded onto posterior surface. Propodeum with oblique carina obscure, lateral carina short, not reaching dorsal margin. MALE. Unknown.  Range. Coloradoto British Columbia( Fig. 165).  Additional material examined.   CANADA: BRITISH COLUMBIA: 1♀ Abbotsford, N49°07´41´´ W122°25´05´´  13.v.2003(C. Ratti);  1♀ Abbotsford, N49°07´41´´ W122°25´05´´  16.v.2003( C. Ratti);  1♀ Abbotsford, N49°07´41´´ W122°25´05´´  25.v.2003( C. Ratti);  1♀ Abbotsford, N49°07´41´´ W122°25´05´´  31.v.2003( C. Ratti); [ PCYU];  1♀ Aldergrove,  50–100 m,  3.vii.1978( N.L.H. Krauss); [ AMNH];  1♀ Cowichan RiverP.P,  10 kmE Lake Cowichan, N48°46´39´´ W123°56´30.2´´  11.v.2005, wpt (E. Elle);  1♀ Fort Langley, N49°09´27´´ W122°29´56´´  18.vi.2004(C. Ratti);  1♀ Mission, N49°12´36´´ W122°14´46´´  19.v.2003( C. Ratti);  2♀ Mission, N49°12´36´´ W122°14´46´´  22.v.2003( C. Ratti);  1♀ Pitt Meadows, N49°14´59´´ W122°43´02´´  5.vii.2003( C. Ratti);  1♀ Richmond, N49°08´41´´ W123°04´24´´  9.iv.2004( C. Ratti);  1♀ Richmond, N49°08´41´´ W123°04´24´´  14.v.2003( C. Ratti);  1♀ Surrey, N49°05´54´´ W122°47´31´´  4.v.2003( C. Ratti);  2♀ Surrey, N49°05´54´´ W122°47´31´´  14.v.2003( C. Ratti);  1♀ Surrey, N49°05´54´´ W122°47´31´´  20.v.2003( C. Ratti);  1♀ Westham Island, N49°05´18´´ W123°09´50´´  12.v.2003(C. Ratti); [ PCYU];   USA: COLORADO: 1♀ Gilpin Co., HWY 19, N39.87015 W105.46551,  2–31.viii.2007, ( Gibbs& Sheffield); [ PCYU].   Comments.Common. This species is part of the  L. viridatumspecies-group and is very similar to  L. viridatulum.Both were originally described from Colorado. Additional study is needed to determine if these names are synonymous. [495,720,861,884] NMNH United States of America Peaceful Valley 227 228 2 2 Colorado holotype 2003-05-13 Ratti Canada 49.128056 Abbotsford 18 -122.41805 229 230 1 1 British Columbia [596,1385,1144,1170] 2003-05-16 C. Ratti Canada 49.128056 Abbotsford 18 -122.41805 229 230 1 1 British Columbia 2003-05-25 C. Ratti Canada 49.128056 Abbotsford 18 -122.41805 229 230 1 1 British Columbia 2003-05-31 PCYU C. Ratti Canada 49.128056 Abbotsford 18 -122.41805 229 230 1 1 British Columbia [524,1311,1224,1250] 1978-07-03 AMNH N. L. H. Krauss Canada 75 Aldergrove 229 230 1 1 British Columbia 2005-05-11 Elle Canada 48.7775 Cowichan River 15 -123.94173 229 230 1 1 British Columbia 2004-06-18 Ratti Canada 49.1575 Fort Langley 18 -122.498886 229 230 1 1 British Columbia 2003-05-19 C. Ratti Canada 49.21 Mission 18 -122.24611 229 230 1 1 British Columbia [417,1195,1344,1370] 2003-05-22 C. Ratti Canada 49.21 Mission 18 -122.24611 229 230 2 2 British Columbia 2003-07-05 C. Ratti Canada 49.24972 Pitt Meadows 18 -122.717224 229 230 1 1 British Columbia 2004-04-09 C. Ratti Canada 49.144726 Richmond 18 -123.07333 229 230 1 1 British Columbia [249,1094,1424,1450] 2003-05-14 C. Ratti Canada 49.144726 Richmond 18 -123.07333 229 230 1 1 British Columbia 2003-05-04 C. Ratti Canada 49.09833 Surrey 18 -122.79195 229 230 1 1 British Columbia [567,1296,1464,1490] 2003-05-14 C. Ratti Canada 49.09833 Surrey 18 -122.79195 229 230 2 2 British Columbia 2003-05-20 C. Ratti Canada 49.09833 Surrey 18 -122.79195 229 230 1 1 British Columbia 2003-05-12 PCYU Ratti Canada 49.088333 Westham Island 18 -123.16389 229 230 1 1 British Columbia 2007-08-02 2007-08-31 2007-08-02 PCYU Gibbs & Sheffield United States of America Gilpin Co. 39.87015 Gilpin Co. 1 -105.46551 229 230 1 1 Colorado