Lasioglossum (Dialictus) tuolumnense Gibbs, 2009

Gardner, Joel & Gibbs, Jason, 2020, The ‘ red-tailed’ Lasioglossum (Dialictus) (Hymenoptera: Halictidae) of the western Nearctic, European Journal of Taxonomy 725, pp. 1-242: 199-200

publication ID

publication LSID


persistent identifier

treatment provided by


scientific name

Lasioglossum (Dialictus) tuolumnense Gibbs, 2009


Lasioglossum (Dialictus) tuolumnense Gibbs, 2009  

Fig. 87 View Fig

Lasioglossum (Dialictus) tuolumnense Gibbs, 2009: 382   , figs 10a–b, 11a–b, 12a–d (holotype, ♀, deposited in BBSL, examined).

Lasioglossum (Dialictus) tuolumnense   – Heron & Sheffield 2015 (distribution).


Both sexes of Lasioglossum tuolumnense   can be recognized by the characters for the Lasioglossum petrellum   species complex (below), in addition to the characters given in the keys. Females are most similar to L. griswoldi   , and probably males as well (the male of L. griswoldi   is not described). Females of L. griswoldi   have the malar space and supraclypeal area longer, and scutum slightly shinier and less densely punctate. In addition, the geographic ranges of these two species are not known to overlap: L. tuolumnense   is only known from the mountains of California north to British Columbia, while L. griswoldi   is only known from Utah and Colorado.

Material examined


UNITED STATES – California • ♀; Tuolumne Co., 2.2 mi. WNW of Mount Gibson; 38.01029° N, 119.738° W; 2036 m a.s.l.; 1 Aug. 2005; L. Fuerst and H. Briggs leg.; BBSL. GoogleMaps  

Other material

UNITED STATES – California • 1 ♀; Alpine Co., Woodfords ; [38.78° N, 119.82° W]; 18 Oct. 1962; W.R. Bauer leg.; LACM GoogleMaps   1 ♀; Amador Co., Bear River Reservoir ; [38.56° N, 120.22° W]; 1 Aug. 1970; S.R. Sims leg.; UCDC GoogleMaps   1 ♀; El Dorado Co., Ice House Road (24 air mi. ENE of Placerville); [38.87° N, 120.38° W]; 16–17 Jul. 1983; W.J. Pulawski leg.; CAS GoogleMaps   1 ♀; Fresno Co., Kip Camp Area, Mt. Abbot Map ; [37.37° N, 118.89° W]; 3 Jul. 1981; J.A. Halstead leg.; BBSL GoogleMaps   1 ♀; Kern Co., Sand Canyon 3 mi. W of Brown; [35.78° N, 117.92° W]; 7 Apr. 1966; R.M. Bohart leg.; UCDC GoogleMaps   1 ♀; same location as for preceding; 7 Apr. 1966; R.O. Schuster leg.; UCDC GoogleMaps   1 ♀; Mono Co., Convict Lake ; [37.6° N, 118.86° W]; 2530 m a.s.l.; 24 Jul. 1978; G.A. Levin leg.; ex Penstemon bridgesii   ; UCDC GoogleMaps   1 ♀; Mono Co., White Mountains, Crooked Creek Ranger Station ; 37.4983° N, 118.17° W; 3094 m a.s.l.; 4 Jul. 2004; F.D. Parker leg.; BBSL GoogleMaps   1 ♀; Tulare Co., Ash Mountain HQ; [36.49° N, 118.84° W]; 518 m a.s.l.; 3 May 1979; J.A. Chemsak leg.; EMEC GoogleMaps   2 ♀♀; same location as for preceding; 3–4 May 1979; M.E. Buegler leg.; EMEC GoogleMaps   1 ♀; Tulare Co., Ash Mountain Kaweah Power Station #3; [36.486° N, 118.837° W]; 15 Aug. 1982; J.A. Halstead leg.; BBSL GoogleMaps   1 ♀; Andreas Canyon ; [33.75° N, 116.6° W]; 6 Mar. 1933; H.L. McKenzie leg.; UCDC GoogleMaps   1 ♀; Half Moon L., Tahoe ; [38.89° N, 120.13° W]; 23 Jul. 1915; E.P. Van Duzee leg.; USNM GoogleMaps   1 ♀; Julian ; 33.1739° N, 116.6228° W; 25 Jun. 2016; K.J. Hung, Petterson, Matagual leg.; ex Calochortus weedii   ; WRME GoogleMaps   1 ♀; Mineralking ; [36.45° N, 118.595° W]; 11 Jul. 1935; BBSL GoogleMaps   .

See also material in Gibbs (2009b).


See Gibbs (2009b) for a complete description and figures.


High elevations from southern California north to southern British Columbia ( Fig. 87 View Fig ).

Floral records

AMARYLLIDACEAE J. St.   -Hil. Allium   L. A. yosemitense Eastw.   (G09) • ASTERACEAE Giseke   : Cirsium   : C. occidentale (Nutt.) Jeps. C.   o. var. californicum (A.Gray) D.J. Keil & C.E. Turner   (G09) • Eriophyllum   : E. lanatum (Pursh) J. Forbes   : E. L. var. integrifolium (Hook.) Smiley   (G09) • Malacothrix   (G09) • Senecio   : S. scorzonella Greene   (G09) • ERICACEAE Juss.   Arctostaphylos Adans.   A. viscida Parry   (G09) • LILIACEAE Juss.   Calochortus Pursh   : C. weedii Alph. Wood   LIMNANTHACEAE R.Br.   Limnanthes R.Br.   L. montana Jeps.   (G09) • PLANTAGINACEAE Juss.   Keckiella Straw   : K. breviflora (Lindl.) Straw   (G09) • Penstemon Schmidel   : P. bridgesii A.Gray   P. newberryi A.Gray   (G09) • ROSACEAE Juss.   Chamaebatia Benth.   C. foliolosa Benth.   (G09).

DNA barcodes

Seven sequences available (BOLD process IDs: DLII296-07, DLII302-07, DLII305-07, DLII922-07, DLII942-07, DLII944-07, DLII998-07; BIN: BOLD:AAD3535). Lasioglossum tuolumnense   differs from L. droegei   , L. griswoldi   , and L. petrellum   by 1 fixed substitution: 153(T) (Supplementary file 4). No unique fixed substitutions distinguish L. tuolumnense   from all other western red-tailed L. ( Dialictus   ).


At least one specimen from the Cascade Mountains in Oregon has a completely black metasoma. This specimen was not available for physical study, but photographs taken by Joe Engler (FWSE) were examined and match L. tuolumnense   except in colouration.


USA, California, Davis, University of California, R.M. Bohart Museum of Entomology


USA, California, San Francisco, California Academy of Sciences


USA, California, Berkeley, University of California, Essig Museum of Entomology


USA, Washington D.C., National Museum of Natural History, [formerly, United States National Museum]


R. M. Bohart Museum of Entomology


Smithsonian Institution, National Museum of Natural History














Lasioglossum (Dialictus) tuolumnense Gibbs, 2009

Gardner, Joel & Gibbs, Jason 2020

Lasioglossum (Dialictus) tuolumnense

Lasioglossum (Dialictus) tuolumnense Gibbs, 2009: 382 , figs 10a–b, 11a–b, 12a–d

Lasioglossum (Dialictus) tuolumnense

Lasioglossum (Dialictus) tuolumnense – Heron & Sheffield 2015