Lasioglossum (Dialictus) droegei 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: 74-77

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Lasioglossum (Dialictus) droegei Gibbs, 2009


Lasioglossum (Dialictus) droegei Gibbs, 2009  

Fig. 34–35 View Fig View Fig , 93B View Fig , 111B View Fig , 112B View Fig

Lasioglossum (Dialictus) droegei Gibbs, 2009b: 387   , figs 14a–b (holotype, ♀, deposited at PCYU, examined).


Both sexes of Lasioglossum droegei   can be recognized by the characters for the Lasioglossum petrellum   species complex (below), in addition to the characters given in the keys. They are most similar to L. petrellum ( Cockerell, 1903)   . Females of L. petrellum   have T2–4 with less extensive tomentum, and usually metasoma with larger brown to black patches laterally. Males of L. petrellum   have the T1–3 apical areas slightly shinier and distinctly punctate. In addition, the distributions of these two species are not known to overlap: L. droegei   is only known from the Chihuahuan Desert, while L. petrellum   is known from the Sonoran Desert and west coast of California and Baja California.

Material examined


UNITED STATES – Texas • ♀; Brewster Co.; 29.1466° N, 103.1876° W; 1 May [2002]; H.W. Ikerd leg.; PCYU. GoogleMaps  

Other material

MEXICO – Nuevo Leon • 1 ♀; 3 km SW of Galeana; [24.81° N, 100.1° W]; 1550 m a.s.l.; 19 Mar. 1991; R. Brooks and R. Leschen leg.; SEMC GoogleMaps   .

UNITED STATES – New Mexico • 1 ♂; Eddy Co.; 32.178° N, 104.4877° W; 8 Jun. 2010; A. Druk leg.; BBSL GoogleMaps   . – Texas • 1 ♀; Brewster Co., Big Bend Natl. Park , Oak Canyon ; [29.28° N, 103.33° W]; 1400– 1520 m a.s.l.; 11 Apr. 1986; T. Griswold leg.; ex Penstemon   ; BBSL GoogleMaps   1 ♀; Brewster Co., Big Bend Natl. Park , Oak Spring ; [29.282° N, 103.332° W]; 18 Jun. 1999; S. Droege leg.; BBSL GoogleMaps   .

See also material in Gibbs (2009b).



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


COLOURATION. Head and mesosoma blue-green to golden-green; clypeus apical colour black with narrow translucent orange flange; labrum reddish brown to orange; mandible orange with black base and red tip; flagellum black dorsally, orange ventrally; pronotal lobe reddish brown; metasoma black to reddish brown with rims of terga and sterna and downcurved lateral areas of terga narrowly translucent brown to orange; legs metallic green with tibiae and basitarsi black and distitarsi reddish brown; tegula orange; wing membrane hyaline, veins dark brown.

PUBESCENCE. Body hair colour white. Tomentum dense on paraocular area, supraclypeal area between antennae, pronotal angle and lobe, and space between pronotal lobe and tegula; sparse on clypeus, gena anteriorly, and metanotum anteriorly. Scutum hair thin. Sterna hair short (0.5–1 OD), moderately plumose, sparse and erect. Wing hairs dark, long and dense.

SURFACE SCULPTURE. Clypeus punctures moderately dense (i=1–2 pd), sculpture finely reticulate in basal ¾, shiny apically; supraclypeal area punctures sparse (i=1–4 pd), sculpture imbricate; paraocular area punctures dense (i <1 pd), sculpture imbricate; frons punctures crowded (i= 0 pd), indistinct, sculpture reticulate; vertex punctures crowded laterally (i=0 pd), absent medially, sculpture imbricate laterally, rugulose medially; gena punctures moderately dense (i=1–2 pd), sculpture shiny, becoming imbricate and weakly lineate posteriorly and ventrally; postgena sculpture finely reticulate, becoming weakly lineate posteriorly; tegula punctures absent; scutum punctures dense (i <1 pd), sculpture finely reticulate; scutellum punctures dense marginally and on median line (i <1 pd), moderately sparse submedially (i=1–2 pd), sculpture finely reticulate; metanotum sculpture imbricate and densely punctate (i <1 pd); metapostnotum rugae strong, anastomosing, not reaching margin, sculpture finely reticulate; preëpisternum sculpture rugulose; hypoepimeron punctures absent, sculpture finely reticulate; mesepisternum punctures dense (i <1 pd), indistinct, sculpture finely reticulate; metepisternum sculpture lineate dorsally, rugulose ventrally; propodeum lateral face punctures obscure, sculpture finely reticulate; propodeum posterior face sculpture imbricate and densely punctate laterally (i <1 pd), becoming shiny and sparsely punctate medially (i=1–4 pd); T1 anterior face sculpture weakly coriarious; T1 dorsal surface punctures crowded (i=0 pd), becoming dense laterally (i ≤ 1 pd), sculpture weakly coriarious, becoming finely reticulate apically; T2 disc punctures crowded (i =0 pd), becoming dense laterally (i ≤ 1 pd), disc sculpture weakly coriarious, becoming finely reticulate apically, rim punctures dense (i <1 pd), rim sculpture finely reticulate.

STRUCTURE. Face length/width ratio 0.91. F1:pedicel length ratio 1.29; F2:F1 length ratio 1.55; F2 length/ width ratio 1.7; F9 length/width ratio 1.37. Forewing with 3 submarginal cells; pronotal angle obtuse; tegula shape normal. Intertegular distance 1.08 mm. Scutum length/width ratio 0.88; scutum:scutellum

length ratio 2.57; scutellum:metanotum length ratio 1.72; metanotum:metapostnotum length ratio 0.74. Propodeum lateral carinae not reaching dorsal margin; oblique carina absent. (n= 1)

GENITALIA. Not examined.

Range Chihuahuan Desert from New Mexico and Texas to Nuevo Leon ( Fig. 35 View Fig ).

Floral records

LAMIACEAE Martinov   : Hedeoma Pers.   H. apiculata W.S. Stewart   (G09) • PLANTAGINACEAE Juss.   Penstemon Schmidel.  

DNA barcodes

Five sequences available (BOLD process IDs: DLII034-06, DLII035-06, DLII1302-08, DLII1538- 09, LASNA009-08; BIN: BOLD:AAZ1858). Lasioglossum droegei   differs from all other western red-tailed L. ( Dialictus   ) by 1 fixed substitution: 303(C). It differs from L. griswoldi   , L. petrellum   , and L. tuolumnense   by an additional 2 fixed substitutions: 117(C) and 228(G) (Supplementary file 4).


Gibbs (2009b) recorded L. droegei   from only a single location in Texas. Additional specimens are now known from New Mexico and Nuevo Leon. The male is described here for the first time.




University of Kansas - Biodiversity Institute














Lasioglossum (Dialictus) droegei Gibbs, 2009

Gardner, Joel & Gibbs, Jason 2020

Lasioglossum (Dialictus) droegei

Gibbs J. 2009: 387