Lasioglossum (Dialictus) raleighense (Crawford)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216 : 160-163

publication ID 10.5281/zenodo.1049595

publication LSID


persistent identifier

treatment provided by


scientific name

Lasioglossum (Dialictus) raleighense (Crawford)


Lasioglossum (Dialictus) raleighense (Crawford)

( Figures 170–173 View FIGURE 170 View FIGURE 171 View FIGURE 172 View FIGURE 173 )

Halictus raleighensis Crawford, 1932: 73 . Ƥ.

Holotype. Ƥ USA, North Carolina, Raleigh , 1923, on Baptisia tinctoria, (T.B. Mitchell) ; [ AMNH]. Examined.

Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) raleighense Michener, 1951: 1117 (catalogue); Mitchell, 1960: Dialictus raleighensis Ƥ 3, p. 416 (redescription); Krombein, 1967: Lasioglossum (Dialictus) raleighense , p. 465 (catalogue); Moure and Hurd, 1987: Dialictus raleighensis , p. 126 (catalogue).

Diagnosis. Female L. raleighense can be recognised by the following diagnostic combination: clypeus and supraclypeal area flat, dull due to microsculpture ( Fig. 170 View FIGURE 170 B); mesoscutal punctation dense (i<d) ( Fig. 171 View FIGURE 171 ); metasomal terga brown, tomentum, moderately sparse, and apical impressed areas with deep, distinct punctation. They are most similar to L. batya , which has supraclypeal area polished and shiny ( Fig. 69 View FIGURE 69 B).

Male L. raleighense can be recognised by the following diagnostic combination: clypeus yellow distally ( Fig. 172 View FIGURE 172 B), supraclypeal area imbricate, flagellomeres short (F 2 –F 10 length/width ratio = 1.13–1.18) ( Fig. 172 View FIGURE 172 B), mesoscutal punctures contiguous, and metasomal terga with apical impressed areas deeply and distinctly punctate. They are most similar to L. batya , which has supraclypeal area polished and shiny.

Redescription. FEMALE. Length 4.60–4.96 mm; head length 1.37–1.44 mm; head width 1.34–1.42 mm; forewing length 2.96–3.15 mm.

Colouration. Head and mesosoma pale green to bluish green. Clypeus with apical half blackish brown. Supraclypeal area bronze. Antenna dark brown, flagellum with ventral surface reddish brown to orange-yellow. Tegula amber. Wings faintly dusky, venation and pterostigma reddish brown. Legs brown, except medio- and distitarsi reddish brown. Metasomal terga golden brown with narrow reddish rim, sterna brown, apical margins pale, translucent yellow.

Pubescence. Dull white. Head and mesosoma with moderately dense woolly hairs (1–1.5 OD), longest on genal beard, metanotum, and mesopleuron (2–2.5 OD). Paraocular area and gena with subappressed tomentum partially obscuring surface. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with moderately dense, fine hairs. T 1 acarinarial fan complete. T 1 dorsolateral portion with sparse tomentum. T 2 –T 3 laterally and T 4 entirely with sparse tomentum not obscuring surface. T 2 apicolateral and T 3 –T 4 apical margins with sparse fringes.

Surface sculpture. Face tessellate-imbricate, punctation fine. Clypeus punctation evenly spaced (i= 1–2 d). Supraclypeal area imbricate, punctation moderately sparse (i= 1–3 d). Lower paraocular and antennocular areas with punctation dense (i≤d). Upper paraocular area, frons and ocellocular area punctate-reticulate. Gena and postgena lineolate. Mesoscutum and mesoscutellum tessellate, punctation dense throughout (i≤d). Axilla punctate-reticulate. Metanotum imbricate. Preëpisternum rugose. Hypoepimeral area reticulate-rugulose. Mesepisternum reticulate-rugulose, weakly rugulose posteriorly. Metepisternum with dorsal portion rugoso-carinulate, ventral half imbricate. Metapostnotum with weak rugae poorly defined amidst tessellate interstices, posterior margin tessellate-granular. Propodeum with dorsolateral slope tessellate, lateral surface and posterior rugulose-imbricate. Metasomal terga polished, apical impressed areas weakly coriarious, punctation dense and distinct throughout (i= 1–1.5 d).

Structure. Head round to elongate (length/width ratio = 1.00– 1.03). Eyes strongly convergent below (UOD/ LOD ratio = 1.44–1.48). Clypeus ½ below suborbital tangent, apicolateral margins weakly convergent. Antennal sockets close (IAD/OAD <0.5). Frontal line carinate, ending 2 OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 3–4 branches. Metapostnotum truncate (MMR ratio = 1.30–1.44), lateral margin distinct, posterior margin weakly angled onto posterior surface. Propodeum with oblique carina fine, lateral carina not reaching dorsal margin.

MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 3.39–3.96 mm; head length 1.30–1.32 mm; head width 1.21–1.25 mm; forewing length 2.78–2.84 mm.

Colouration. Labrum, mandible and distal margin of clypeus brownish yellow. Flagellum with ventral surface brownish yellow. Legs brown, except tibial bases and apices and tarsi brownish yellow.

Pubescence. Paraocular area below eye emargination with tomentum obscuring surface. S 2 –S 4 with moderately elongate woolly hairs (1.5–2 OD).

Surface sculpture. Clypeus and supraclypeal area imbricate, punctation moderately dense (i= 1–1.5 d). Mesepisternum reticulate-punctate dorsally. T 1 anterior surface with punctures evenly spaced (i= 1–2.5 d).

Structure. Head elongate (length/width ratio = 1.06–1.07). Eyes strongly convergent below (UOD/LOD ratio = 1.67). Clypeus 2 / 3 below suborbital tangent, apicolateral margins subparallel. Antennal sockets distant (IAD/OAD = 1.0). Frontal line carinate, ending 2 OD below median ocellus. Pedicel subequal to F 1. F 2 length 1.0– 1.1 X F 1. F 2 –F 10 short (length/width ratio = 1.13–1.18). Metapostnotum moderately truncate (MMR ratio = 1.22–1.41), posterior margin rounded onto posterior surface.

Terminalia . S 7 with median lobe nearly parallel sided, apex rounded ( Fig. 173 View FIGURE 173 ). S 8 with apicomedial margin weakly convex ( Fig. 173 View FIGURE 173 ). Genital capsule as in Fig. 173 View FIGURE 173 . Gonobase with ventral arms widely separated. Volsella short, nearly round. Gonostylus small, dorsal setae elongate. Retrorse lobe elongate, strongly attenuated apically, apex recurved.

Range. North Carolina south to Georgia ( Fig. 174 View FIGURE 174 ). USA; GA, NC.

Additional material examined. USA: GEORGIA: 4 ƤƤ 13 Forsyth, 23–30.ix. 1970 (F.T. Naumann); 1 Ƥ Rabun Bald, 4700 ft., 16.vii .. 1957 (W.R. Richards); 1 Ƥ Rabun Bald, 9.viii. 1957 (L.A. Kelton); [ CNC]; 3 ƤƤ Jasper Co., 18.vii. 2008 (J. Hanula & S. Horn); [ PCYU]; NORTH CAROLINA: 1 Ƥ Wayne Co., 23.v. 1954 (T.B. Mitchell); [ CUIC]; 2 ƤƤ Harnett Co., 18.v. 1935 (H.F. Schoof); 1 Ƥ Wayne Co., 23.v. 1954 (T.B. Mitchell); 3 ƤƤ Raleigh, 17.v. 1942 (T.B. Mitchell); 1 Ƥ Southern Pines, 23.ix. 1950 (T.B. Mitchell); [ NCSU].

Floral records. FABACEAE : Baptisia tinctoria , Galactia , Tephrosia ; POLYGONACEAE : Polygonum .

DNA Barcode. Available. Multiple sequences.

Comments. Uncommon.

Lasioglossum raleighense is used in a more restricted sense than in previous studies (e. g. Mitchell 1960), due to the description of the related species L. batya (above).


American Museum of Natural History


Canadian National Collection of Insects, Arachnids, and Nematodes


The Packer Collection at York University


Cornell University Insect Collection


North Carolina State University Insect Museum


Department of Natural Resources, Environment, The Arts and Sport














Lasioglossum (Dialictus) raleighense (Crawford)

Gibbs, Jason 2011

Halictus raleighensis

Crawford 1932: 73