Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 106-109
Holotype. ♀ CANADA, British Columbia, Similkameen Reg. Dist., Oliver, Ripley Lk. N49.2432 W119.6329, 925 m,
12.vii.2008 (L.R. Best); [PCYU].
Diagnosis. Females of L. dashwoodi can be recognised by the diagnostic combination of a golden green head
and mesosoma, wide head (length/width ratio = 0.94), distinctly purplish supraclypeal area smooth and shining
integument with coarse moderately sparse punctures (i=12.5d) on the mesoscutum and mesepisternum,
posterior margins of the dorsolateral slope and metapostnotum rugulose, and metallic metasomal terga with
fine punctures on the relatively polished apical impressed areas. They are most similar to L. abundipunctum
and L. punctatoventre. Female L. abundipunctum have the posterior margins of the dorsolateral slope and
metapostnotum smooth and distinct punctures on the apical impressed areas of the metasomal terga. Female L.
punctatoventre have the apical impressed areas of the metasomal terga strongly coriarious. Female L. reasbeckae
is also similar but lacks metallic reflections on the metasomal terga.
Males of L. dashwoodi can be recognised by the diagnostic combination of very coarse and relatively
sparse mesoscutal and mesepisternal punctures, tarsi brown and metasomal terga metallic.
Description. FEMALE. Length 5.326.29 mm; head length 1.581.63 mm; head width 1.701.73 mm;
forewing length 4.364.42 mm.
Colouration. Head and mesosoma bluish to golden green. Clypeus with apical 4/5 blackish brown, basal
1/5 brassy. Supraclypeal area purplish-brassy. Antenna dark brown, with ventral surface brownish yellow.
Tegula dark, reddish brown. Wing membrane subhyaline, venation and pterostigma honey coloured. Legs
brown, medio- and distitarsi brownish red. Metasomal terga weakly metallic green, sterna brown, apical margins
broadly reddish brown to translucent yellow.
Pubescence. Dull white. Moderately dense. Head and mesosoma with moderately sparse woolly hairs (1
1.5 OD), longest on genal beard, metanotum and mesopleuron (22.5 OD). Lower paraocular area and genawith sparse tomentum not obscuring surface. Metanotum anteromedial portion with dense tomentum obscuring
surface. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (22.5 OD).
Metasomal terga with moderately dense, fine setae. T1 acarinarial fan sparse, complete dorsally, intermingled
with erect hairs. T2 basolateral and T3T4 with moderately dense tomentum, partially obscuring surface. T2
apicolateral and T3T4 apical margins with fringes weak, nearly absent.
Surface sculpture. Face polished, weakly imbricate, punctation coarse. Clypeus with punctation moderately
sparse (i=12.5d). Supraclypeal area with punctation sparse (i=13d). Lower paraocular and antennocular
areas with punctation dense (i≤d). Upper paraocular area and frons punctate-reticulate. Ocellocular area
irregularly punctate (i=12d). Gena shining, weakly striate. Postgena polished, coarsely punctate. Mesoscutum
polished, anteromedial portion weakly imbricate, punctation coarse, sparse between parapsidal lines
(i=12.5d), moderately dense laterad of parapsidal lines (i=11.5d), contiguous on anterolateral portions.
Mesoscutellum similar to mesoscutum, submedial punctation sparse (i=24d). Axilla punctate. Metanotum
ruguloso-imbricate. Preλpisternum reticulate-punctate. Hypoepimeral area polished, punctate (i=11.5d).
Mesepisternum polished, weakly lineolate, coarsely punctate (i=11.5d). Metepisternum with dorsal third
finely ruguloso-striate, ventral portion reticulate-imbricate. Metapostnotum anastomosingly rugose. Propodeum
with dorsolateral slope and lateral and posterior surfaces ruguloso-imbricate. Metasomal terga polished
except apical margins coriarious, punctation on basal halves dense (i=12d), obscure on apical halves (i=1
3d).
Structure. Head wide (length/width ratio = 0.930.94). Eyes weakly convergent below (UOD/LOD ratio =
1.161.17). Clypeus ½ below suborbital tangent, apicolateral margins convergent. Antennal sockets close
(IAD/OAD < 0.5). Frontal line carinate, ending 2.5 OD below median ocellus. Gena narrower than eye. Inner
metatibial spur pectinate with 34 teeth. Metapostnotum moderately elongate (MMR ratio = 1.131.14), posterior
margin rounded onto posterior surface. Propodeum with oblique carina weak, obscure, lateral carina
widely divergent, not reaching margin of dorsal surface.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 5.32
mm; head length 1.60 mm; head width 1.68 mm; forewing length 3.81 mm.
Colouration. Body bluish with greenish reflections. Supraclypeal area bluish. Flagellum with ventral surface
orange-yellow. Medio- and distitarsi reddish brown.
Pubescence. Lower face with sparse tomentum, paritally obscuring surface, denser on lower paraocular
area. T1 declivitous surface with fan shaped hairs. T2T5 with sparse wooly hairs. S2S4 apicolateral portions
with posteromedially directed hair tufts.
Surface sculpture. Supraclypeal area densely punctate (i≤d). Mesoscutal and mesoscutellar punctation
sparse (i=13d). Apical impressed areas of T2T4 almost completely impunctate.
Structure. Head moderately wide to round (length/width ratio = 0.95). Eyes strongly convergent below
(UOD /LOD ratio = 1.43). Antennal sockets distant (IAD/OAD > 1.4). Pedicel shorter than F1. F2 length
1.8X F1. F2F10 (length/width ratio = 1.561.79). Metapostnotum moderately elongate (MMR ratio = 1.29),
posterior margin narrowly rounded onto posterior surface.
Terminalia. S7 median lobe narrowly clavate (Fig. 96D). S8 apical margin weakly concave (Fig. 96D).
Genitalia as in Fig. 96DF, H. Gonobase with ventral arms narrowly separated. Gonostylus small, dorsal setae
elongate. Retrorse lobes elongate, attenuated apically (Fig. 96D).
Range. British Columbia south to Washington
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