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Identification Summary: Very similar to L. supraclypeatum; only the type is known, collected from Wayne County, NC; supraclypeus not as swollen; only a few pits in supraclypeus center; pit density in the paraocular region about as dense as those around the antennae. We would be very interested in seeing any specimens of this species!
Reprinted with permission from: Mitchell, T.B. 1960 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.
FEMALE—Length 5 mm.; head and thorax brassy green in general, the clypeus and supraclypeal area somewhat purplish, abdominal terga more piceous, but with metallic green reflections, legs dark, tarsi more or less testaceous; pubescence short, thin, entirely pale, becoming quite dense on the more apical abdominal terga; head considerably broader than long; clypeus projecting somewhat more than one-half below suborbital line; supraclypeal area subequal in length to clypeus; eyes convergent below; lateral ocelli much nearer eyes than to each other; cheeks subequal to eyes in width; punctures of head coarse, deep and distinct, very close below ocelli, becoming rather sparse below a line just above antennae, supraclypeal area somewhat swollen, punctures coarse and quite sparse, these somewhat closer along upper margin of clypeus, but becoming very coarse and sparse toward apical margin; vertex more shining, punctures finer, quite close but distinct, those on cheeks fine and rather obscure, quite close above, but surface becoming rather coarsely striate below; hypostomal carinae parallel, apical angle quite abrupt; scutum and scutellum somewhat shining between coarse, deep and distinct punctures, these only slightly separated in central area of scutum, somewhat closer but still slightly separated between notaulices and tegulae, rather sparse over most of scutellum; pleura rather coarsely reticulate anteriorly, becoming more finely rugoso-punctate posteriorly where the surface is somewhat shining; dorsal area of propodeum quite coarsely and completely striate, lateral faces somewhat smoother, with a few, scattered, obscure punctures evident at certain angles; wings subhyaline, veins pale testaceous, stigma somewhat more deeply testaceous, 2nd submarginal cell considerably shorter than 3rd, receiving 1st recurrent vein near apex; tegulae yellowish-hyaline; abdominal terga shining, punctures exceedingly minute, rather close on basal terga, especially toward sides, apical impressed areas quite broad, invaded to some degree by exceedingly minute punctures, terga 3 and 4 with rather dense tomentum which tends to obscure the surface.
TYPE S—Holotype: Female, Wayne Co., N. C., June 15, 1955 (H. V. Weems, Jr., on Ceanothus americanus) [Fla. Plant Board]. Paratypes: North Carolina: 1 female, topotypical. MICHIGAN: 1 female, Mackinac Co., June 7, 1957 (R. & K. Dreisbach). MISSOURI: 1 female, Willard, June 11 (A. E. Brower).
Paratypes are in collections of R. R. Dreisbach, Cornell University and the author.
Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 93
Dialictus ceanothi Mitchell, 1960: 386. ♀.
Holotype. ♀ USA, North Carolina, Wayne Co. 15.vi.1955 on Ceanothus americanus, (H. V. Weems, Jr.); [FSCA].
Examined.
Taxonomy. Krombein, 1967: Lasioglossum (Dialictus) ceanothi, p. 463 (catalogue); Hurd, 1979: Dialictus
ceanothi, p. 1965 (catalogue); Moure & Hurd, 1987: Dialictus ceanothi, p. 94 (catalogue).
Diagnosis. Most similar to L. foveolatum. See diagnosis for that species.
Comments. Rare. Unsubstantiated records of this species have been reported from Ontario and Nova
Scotia (Ascher & Pickering 2010). Specimens from the latter locality identified as L. ceanothi have been
examined and were misidentifications. No reliable Canadian records are known and this species has been
excluded from the key and descriptions. This species would run to L. zophops in the key to females but can be
distinguished by the coarse mesoscutal punctures and very weak oblique propodeal carina.
Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.
Lasioglossum (Dialictus) ceanothi (Mitchell)
Dialictus ceanothi Mitchell, 1960: 386. ♀.
Holotype. ♀ USA, North Carolina, Wayne Co.,15.vi.1955, on Ceanothus americanus, (H.V. Weems, Jr.); [FSCA]. Examined.
Taxonomy. Krombein, 1967: Lasioglossum (Dialictus) ceanothi, p. 463 (catalogue); Hurd, 1979: Dialictus ceanothi, p.
1965 (catalogue); Moure & Hurd, 1987: Dialictus ceanothi, p. 94 (catalogue).
Diagnosis. Female L. ceanothi can be recognised by the following diagnostic combination: head wide (length/width
ratio = 0.90) (Fig. 75B); mesoscutal punctures relatively coarse, moderately dense between parapsidal lines (i=1–1.5d)
(Fig. 76); mesepisternum reticulate-rugose; propodeal carinae weak; and T1 polished with acarinarial fan sparse but lacking
a dorsal opening. They are similar to L. foveolatum and L. timothyi. Female L. foveolatum have supraclypeal area
strongly protuberant lower paraocular area sparsely punctate, and parapsidal lines deep and wide. Female L. timothyi
have strong propodeal carinae (Fig. 25A) and T1 acarinarial fan dense.
Male unknown.
Description. FEMALE. Length 4.84–5.00 mm; head length 1.40–1.42 mm; head width 1.53–1.57 mm; forewing
length 3.75–3.88 mm.
Colouration. Head and mesosoma golden green with some faint bluish reflections. Clypeus with apical half blackish
brown, basal half and supraclypeal area bronze. Antenna dark brown, F2–F10 with ventral surface reddish brown. Tegula
amber. Wing membrane subhyaline, venation and pterostigma amber. Legs brown, except tarsi reddish brown. Metasoma
dark brown, terga and sterna reddish apically.
Pubescence. Dull white. Moderately sparse. Head and mesosoma with moderately dense woolly hairs (1–1.5 OD),
longest on genal beard, metanotum, and mesopleuron (2–2.5 OD). Lower paraocular area and gena with sparse subappressed
tomentum not obscuring surface. Metanotum anteromedial margin with tomentum. Propodeum with moderately
dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metepisternum without tomentum. Metasomal terga
with moderately dense, fine hairs. T1 acarinarial fan sparse, complete dorsally. T2–T3 basolaterally and T4 entirely with
tomentum partially obscuring surface. T2 apicolateral and T3–T4 apical margins with dense apical fringes.
Surface sculpture. Face imbricate, punctation moderately coarse. Clypeus polished, basal margin imbricate, punctation
moderately dense (i=1–2d). Supraclypeal area with punctation moderately dense (i=1–1.5d). Lower paraocular area
punctation dense (i≤d). Antennocular area punctation moderately dense (i=1–1.5d). Upper paraocular area and frons
reticulate-punctate. Ocellocular area distinctly punctate (i≤d). Gena and postgena weakly carinulate. Mesoscutum weakly imbricate, nearly polished except medially, punctation moderately coarse and dense between parapsidal lines (i=1–1.5d),
dense laterad of parapsidal line (i≤d), and anterolateral portion punctate-reticulate. Mesoscutellum polished, submedial area punctation sparse (i=1.5–2.5d). Axilla punctate. Metanotum ruguloso-imbricate. Preëpisternum rugose. Hypoepimeral
area and mesepisternum reticulate-rugose. Metepisternum with dorsal half rugoso-carinulate, ventral half imbricate.
Metapostnotum with coarse rugae reaching posterior margin, submedially with anastomosing rugae. Propodeum with
dorsolateral slope carinulate anteriorly, rugulose-imbricate posteriorly, lateral surface rugulose-imbricate, posterior surface
tessellate. Metasomal terga polished except apical T1 declivitous surface and apical impressed areas weakly coriarious.
T1 dorsal surface punctation sparse (i=2–5d). T2–T4 punctation moderately sparse medially (i=1–3d), denser
laterally (i=1–1.5d).
Structure. Head very wide (length/width ratio = 0.90–0.92). Eyes convergent below (UOD/LOD ratio = 1.22–1.27).
Clypeus 1/2 below suborbital tangent, apicolateral margins convergent. Antennal sockets close (IAD/OAD < 0.5). Frontal
line carinate, ending 2 OD below median ocellus. Supraclypeal area distinctly convex. Inner metatibial spur pectinate
with 3 branches. Metapostnotum moderately elongate (MMR ratio = 1.13–1.17), narrowly rounded onto posterior surface.
Propodeum with oblique carina virtually absent, lateral carina reaching 2/3 distance to dorsal margin.
MALE. Unknown.
Range. North Carolina, north to Michigan, west to Missouri (Fig. 74). USA: MI, MO, NC.
Additional material examined. MICHIGAN: 1♀ paratype [head glued to label not conspecific] Mackinac Co.,
6.vii.1957 (R. & K. Dreisbach); [CUIC]; MISSOURI: 1♀ paratype Willard, 11.vi (A.E. Brower); [CUIC]; NORTH
CAROLINA: 1♀ paratype Wayne Co. 15.vi.1955 (H.V. Weems, Jr.); [CUIC].
Floral records. RHAMNACEAE: Ceanothus americanus.
DNA Barcode. Unavailable.
Comments. Rare. Only specimens in the type series have been examined.
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