The ‘ red-tailed’ Lasioglossum (Dialictus) (Hymenoptera: Halictidae) of the western Nearctic Author Gardner, Joel AA15FE6E-921A-46D6-BC67-88E067F283D9 0000-0003-1843-466X Department of Entomology, University of Manitoba, 12 Dafoe Rd., Winnipeg, Manitoba, R 3 T 2 N 2, Canada. clickbeetle3364@gmail.com Author Gibbs, Jason BA42A49F-3EBC-4679-8F03-A58E798106B1 0000-0002-4945-5423 Department of Entomology, University of Manitoba, 12 Dafoe Rd., Winnipeg, Manitoba, R 3 T 2 N 2, Canada. jason.gibbs@umanitoba.ca text European Journal of Taxonomy 2020 2020-11-27 725 1 242 journal article 10.5852/ejt.2020.725.1167 9e062836-3946-4ac6-8910-304cadff0d4b 2118-9773 4298139 89FA8DDF-F4B9-417A-A5AF-B2BC9660E024 Lasioglossum ( Dialictus ) griswoldi Gibbs, 2009 Fig. 41 Lasioglossum ( Dialictus ) griswoldi Gibbs, 2009b: 385 , figs 13a–b ( holotype , , deposited in BBSL, examined). Diagnosis 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 Holotype UNITED STATES Utah ; Kane Co. , No Mans Mesa ; 37.34555° N , 112.12921° W ; 31 May 2002 ; C. Davidson leg.; ex Packera multilobata ; BBSL . Other material UNITED STATES Colorado 1 ♀ ; White Rocks , near Boulder ; [ 40.06° N , 105.16° W ]; 1676 m a.s.l. ; 5 Jun. 1922 ; AMNH . – Utah 1 ♀ ; Davis Co. , Farmington Canyon ; [ 41° N , 111.86° W ]; 24 Jul. 1970 ; G.F. Knowlton and G.E. Bohart leg.; BBSL 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.; AMNH . See also material in Gibbs (2009b) . Description 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. Range Utah and Colorado ( Fig. 41 ). 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). Remarks 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.