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

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Lasioglossum (Dialictus) tuolumnense Gibbs, 2009


Lasioglossum (Dialictus) tuolumnense Gibbs, 2009 

Fig. 87View 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.; LACMGoogleMaps  1 ♀; Amador Co., Bear River Reservoir ; [38.56° N, 120.22° W]; 1 Aug. 1970; S.R. Sims leg.; UCDCGoogleMaps  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.; CASGoogleMaps  1 ♀; Fresno Co., Kip Camp Area, Mt. Abbot Map ; [37.37° N, 118.89° W]; 3 Jul. 1981; J.A. Halstead leg.; BBSLGoogleMaps  1 ♀; Kern Co., Sand Canyon 3 mi. W of Brown; [35.78° N, 117.92° W]; 7 Apr. 1966; R.M. Bohart leg.; UCDCGoogleMaps  1 ♀; same location as for preceding; 7 Apr. 1966; R.O. Schuster leg.; UCDCGoogleMaps  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  ; UCDCGoogleMaps  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.; BBSLGoogleMaps  1 ♀; Tulare Co., Ash Mountain HQ; [36.49° N, 118.84° W]; 518 m a.s.l.; 3 May 1979; J.A. Chemsak leg.; EMECGoogleMaps  2 ♀♀; same location as for preceding; 3–4 May 1979; M.E. Buegler leg.; EMECGoogleMaps  1 ♀; Tulare Co., Ash Mountain Kaweah Power Station #3; [36.486° N, 118.837° W]; 15 Aug. 1982; J.A. Halstead leg.; BBSLGoogleMaps  1 ♀; Andreas Canyon ; [33.75° N, 116.6° W]; 6 Mar. 1933; H.L. McKenzie leg.; UCDCGoogleMaps  1 ♀; Half Moon L., Tahoe ; [38.89° N, 120.13° W]; 23 Jul. 1915; E.P. Van Duzee leg.; USNMGoogleMaps  1 ♀; Julian ; 33.1739° N, 116.6228° W; 25 Jun. 2016; K.J. Hung, Petterson, Matagual leg.; ex Calochortus weedii  ; WRMEGoogleMaps  1 ♀; Mineralking ; [36.45° N, 118.595° W]; 11 Jul. 1935; BBSLGoogleMaps  .

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. 87View 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