Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 74-76
Holotype. ♀ CANADA, Ontario, Algonquin P.P., Madawaska Lake, 719.vi.2007 (E. Proctor); [PCYU].
Diagnosis. Females of L. atwoodi can be recognised by the diagnostic combination of round head (length/
width ratio = 0.960.98), tessellate-imbricate mesoscutum with moderately coarse punctures that are moderately
sparse on central disc (i=12d), reddish brown tegula, strongly rugose mesepisternum (Fig. 18A), metapostnotum
rugoso-striate but not reaching the posterior margin, T1 acarinarial fan with dorsal opening, brown
metasomal terga with the apical halves obscurely punctate, and T4 with scattered tomentum not obscuring
surface. They are most similar to L. viridatum which have the metapostnotal rugae reaching the posterior margin
and T4 with sparse tomentum partially obscuring surface.
Male unknown.
Description. FEMALE. Length 5.125.67 mm; head length 1.451.52 mm; head width 1.511.58 mm;
forewing length 3.974.03 mm.
Colouration. Head and mesosoma blue with greenish reflections. Clypeus with apical half blackish brown
and basal half, and supraclypeal area greenish. Antenna dark brown, F8F10 with ventral surface brownish
yellow. Tegula reddish brown. Wing membrane subhyaline, venation and pterostigma yellowish brown. Legs
brown, medio- and distitarsi reddish brown. Metasoma dark brown, terga and sterna with apical margins reddish
brown to translucent yellowish brown.
Pubescence. Dull white. Sparse. Head and mesosoma with moderately sparse woolly hairs (11.5 OD),
longest on genal beard, metanotum and mesopleuron (22.5 OD). Lower paraocular area and gena with sparse
subappressed, plumose hairs, not obscuring surface. Propodeum with moderately dense plumose hairs on lateral
and posterior surfaces (22.5 OD). Metanotum anteromedial portion with dense tomentum. Metasomal
terga with extremely sparse, fine setae. T1 acarinarial fan with wide dorsal opening, equal to width of lateral
hair patches. T2T3 basolaterally and T4 entirely with sparse, scattered tomentum. T2 apicolateral and T3T4
apical margins with sparse fringes.
Surface sculpture. Face imbricate, punctation moderately strong. Clypeus with apical half polished, punctation
sparse (i=13d). Supraclypeal area with punctation sparse (i=14d). Lower paraocular and antennocular
areas punctation moderately dense (i=11.5d). Upper paraocular area and frons reticulate-punctate. Ocellocular
area obscurely punctate (i≤d). Gena lineolate, punctation obscure. Postgena imbricate. Mesoscutum and
mesoscutellum tessellate-imbricate, punctation moderately coarse and deep, moderately sparse between
parapsidal lines (i=13d), moderately dense laterad of parapsidal line (i=0.51.5d), and dense on anterolateral
portions (i≤d). Mesoscutellum similar to mesoscutum, submedial punctation sparse (i=25d). Metanotum ruguloso-
imbricate. Preλpisternum rugose. Hypoepimeral area ruguloso-imbricate. Mesepisternum rugose. Metapostnotum
longitudinally rugoso-striate, posterior margin imbricate. Propodeum with dorsolateral slope
rugulose to imbricate, lateral surface rugoso-imbricate, posterior surface tessellate. Metasomal terga polished
except T1 declivitous surface and apical margins weakly coriarious, punctation on basal halves moderately
dense (i=23d), obscure on apical halves (i=24d).
Structure. Head moderately wide (length/width ratio = 0.960.98). Eyes convergent below (UOD/LOD
ratio = 1.181.28). Clypeus ½ below suborbital tangent, apicolateral margins strongly 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 teeth. Metapostnotum moderately elongate (MMR ratio = 1.13
1.19), posterior margin weakly angled onto posterior surface. Propodeum with oblique carina weak, lateral
carina weak, nearly reaching dorsal margin.
MALE. Unknown.
Range. Nova Scotia west to Wisconsin, south to North Carolina
Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.
Lasioglossum (Dialictus) atwoodi Gibbs
Lasioglossum (Dialictus) atwoodi Gibbs, 2010b: 73. ♀.
Holotype. ♀ CANADA, Ontario, Algonquin P.P., Madawaska Lake, 719.vi.2007 (E. Proctor); [PCYU]. Examined.
Diagnosis. Female L. atwoodi can be recognised by the following diagnostic combination: head moderately wide (length/
width ratio = 0.960.98); supraclypeal area wide, sparsely punctate (i=14d); mesoscutum tessellate-imbricate, punctation
moderately coarse, moderately sparse on between parapsidal lines (i=12d); tegula reddish brown; mesepisternum
strongly rugose; metapostnotal rugae nearly reaching the posterior margin; T1 acarinarial fan with dorsal opening; metasomal
terga brown with the apical halves obscurely punctate; and T4 with scattered tomentum not obscuring surface.
They are most similar to L. viridatum, which has denser supraclypeal punctures, metapostnotal rugae reaching the posterior
margin, and T4 with sparse tomentum partially obscuring surface.
Male unknown.
Range. Nova Scotia west to Wisconsin, south along the Appalachian mountains to North Carolina. USA: IL, IN,
MA, MD, ME, MI, NC, NH, NJ, NY, PA, WI. CANADA: NS, ON.
DNA Barcode. Available. Multiple haplotypes.
Comments. Uncommon.
Diagnostic Notes: Female - Thorax mesepisternum on the lower portion adjacent to the metepisternmum there are rows of roughly horizontal parallel striations - - Head, supraclypeus - Extremely tessilated with many microscopic lines making the sparse pits unusually difficult to see.
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