Lasioglossum (Dialictus) griswoldi 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: 88-89

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Lasioglossum (Dialictus) griswoldi Gibbs, 2009


Lasioglossum (Dialictus) griswoldi Gibbs, 2009 

Fig. 41View Fig

Lasioglossum (Dialictus) griswoldi Gibbs, 2009b: 385  , figs 13a–b (holotype, ♀, deposited in BBSL, examined).


Females of Lasioglossum griswoldi  can be recognized by the characters for the Lasioglossum petrellum  species complex (below), in addition to the characters given in the key and the metasomal terga with very narrow rims with long, dense apicolateral fringes (resembling L. cactorum  sp. nov. in this respect). They are most similar to L. tuolumnense  . Females of L. tuolumnense  have the malar space and supraclypeal area shorter, and scutum slightly duller and more densely punctate. In addition, the geographic ranges of these two species are not known to overlap: L. griswoldi  is only known from the mountains of Utah and Colorado, while L. tuolumnense  is only known from the mountains of California north to British Columbia.

Material examined


UNITED STATES – Utah • ♀; Kane Co., No Mans Mesa ; 37.34555° N, 112.12921° W; 31 May 2002; C. Davidson leg.; ex Packera multilobata  ; BBSL.GoogleMaps 

Other material

UNITED STATES – Colorado • 1 ♀; White Rocks, near Boulder; [40.06° N, 105.16° W]; 1676 m a.s.l.; 5 Jun. 1922; AMNHGoogleMaps  . – Utah • 1 ♀; Davis Co., Farmington Canyon ; [41° N, 111.86° W]; 24 Jul. 1970; G.F. Knowlton and G.E. Bohart leg.; BBSLGoogleMaps  1 ♀; Salt Lake Co., N of Mill B trail, Big Cottonwood Canyon ; [40.64° N, 111.72° W]; 6 Jun. 2010; J S. Ascher leg.; AMNHGoogleMaps  .

See also material in Gibbs (2009b).


See Gibbs (2009b) for a complete description and figures of the female. The male has not been described. Some male specimens are located at BBSL, but were unavailable for study.


Utah and Colorado ( Fig. 41View Fig).

Floral records

APIACEAE Lindl.  Cymopterus Raf.  C. beckii S. L. Welsh & Goodrich  (G09) • ASTERACEAE Giseke  : Cirsium  (G09) • Erigeron  (G09) • Heterotheca  : H. villosa (Pursh) Shinners  (G09) • Machaeranthera  : M. canescens (Pursh) A.Gray  (G09) • Packera  : P. multilobata (Torr. & A.Gray ex A.Gray) W.A. Weber & Á. Löve  Psilostrophe  : P. sparsiflora (A.Gray) A. Nelson  (G09) • Senecio  : S. spartioides Torr. & A.Gray  (G09) • Symphyotrichum  : S. chilense (Nees) G.L. Nesom  (G09) • Townsendia  : T. incana Nutt.  (G09) • BRASSICACEAE Burnett  : Erysimum  L. E. capitatum (Douglas) Greene  (G09) • Stanleya Nutt.  S. pinnata (Pursh) Britton  (G09) • CACTACEAE Juss.  Opuntia Mill.  O. erinacea Engelm. & J.M. Bigelow  (G09) • FABACEAE Juss.  Melilotus  : M. officinalis  (L.) Pall. (G09) • MALVACEAE Juss.  Sphaeralcea A. St.  -Hil. S. coccinea (Nutt.) Rydb.  (G09) • PLANTAGINACEAE Juss.  Penstemon Schmidel  : P. eatonii A.Gray  (G09) • POLEMONIACEAE Juss.  Aliciella  Brand: A. caespitosa (A. Gray) J.M. Porter  (G09) •

Gilia Ruiz & Pav.  (G09) • RANUNCULACEAE Juss.  Aquilegia  L. (G09) • ROSACEAE Juss.  Purshia DC. ex Poir.  P. mexicana (D. Don) Henr.  (G09) • TAMARICACEAE Link  : Tamarix L.  (G09).

DNA barcodes

Five sequences available (BOLD process IDs: DLII860-07, DLII861-07, DLII1532-09, DLII1533-09, DLII1535-09; BIN: BOLD:AAD3535). Lasioglossum griswoldi  differs from all other western red-tailed L. ( Dialictus  ) by 2 fixed substitutions: 198(G) and 327(G). It differs from L. droegei  , L. petrellum  , and L. tuolumnense  by an additional 2 fixed substitutions: 81(T) and 387(C) (Supplementary file 4).


Gibbs (2009b) recorded this species only from Utah. It was recorded from Boulder County, Colorado, as L. aff. griswoldi in Scott et al. (2011)  . A Boulder County specimen has been examined by the authors and seems identical to the Utah specimens.

A few specimens not examined by Gibbs (2009b) from Utah have the metasoma completely black, but are otherwise morphologically identical. These might be a distinct species, but without additional evidence, it seems best to consider them no more than a dark variant.














Lasioglossum (Dialictus) griswoldi Gibbs, 2009

Gardner, Joel & Gibbs, Jason 2020

Lasioglossum (Dialictus) griswoldi

Gibbs J. 2009: 385