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Identification Summary: Small; uncommon; very large head; clypeus extremely flat; almost slightly concave; it appear that it may be the same species as L. fattigi, but that is not settled yet; cheek varies from very wide and somewhat angular to something approaching normal; pits on head between ocelli and antennae are more well spaced and discrete compared to other species; striations on propodeal triangle weak and usually only extend about half way on average. We would be interested in seeing any specimens from 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 bluish-green, abdomen piceous, apical margins
terga becoming hyaline; pubescence short, thin, entirely white; length and breadth of head subequal; clypeus flat, only the extreme lateral margins reflexed, projecting about one- half below suborbital line; supraclypeal area considerably broader than long and much shorter than clypeus; eyes only very slightly convergent below; lateral ocelli subequally distant from eyes and each other; cheeks considerably broader than eyes, swollen behind; face below ocelli rather dull, punctures deep and distinct but very fine and close, becoming vague and obscure on vertex; cheeks rather dull, finely striate in general, but the lower surface more tessellate; hypostomal carinae parallel, apical angle rather broadly rounded; lower half of face somewhat shining, punctures fine, rather widely scattered, sparse between antennae and eyes but becoming closer below, those on supraclypeal area very fine and sparse, fine and somewhat closer on upper margin of clypeus, becoming very sparse but still fine toward apical margin, apical half becoming darkened; scutum and scutellum rather dull, punctures rather fine but quite distinct, well separated in center of scutum, becoming quite close between notaulices and tegulae (similar to weemsi, fig. 99), scutellum rather finely punctate in midline, punctures quite sparse on each side; pleura rather smooth but dull, finely subrugose above, becoming more tessellate below and posteriorly; dorsal area of propodeum rather finely and quite regularly and completely striate, lateral surfaces rather smooth but finely roughened; wings hyaline, veins and stigma pale testaceous; tegulae yellowish-hyaline; legs brownish, tarsi becoming somewhat more testaceous; abdominal terga shining, basal tergum nearly impunctate, terga 2 and 3 with very minute, indistinct, scattered punctures across basal half, becoming impunctate apically, impressed apical area rather narrow, becoming rather abruptly and narrowly whitish-hyaline along rims, tergum 4 rather sparsely covered with white tomentum.
TYPE S—Holotype: Female, Raleigh Co.,W. Va., June 6, 1955 (H. V. Weems, Jr., on Apocynum cannabinum) [Fla. Plant Board]. Paratypes: WEST VIRGINIA: 42 females, topotypical. OHIO: 4 females, Coshocton Co., June 11, 1929 (J. S. Hine). TENNESSEE: 1 female, Cumberland Co., June 10, 1946 (Dreisbach); 5 females, White Oak Lake, A. E. C. Area, Oak Ridge, July 22 & 29, Aug. 1 & 26, and Sept. 3, 1957 (M. E. Pryor and H. F. Howden). Kentucky, 19, Rock Castle Co., Aug. 1, 1947 (Bullock—Dreisbach). INDIANA: 2 females, Morgan-Monroe State Forest, July 14-16, 1937 (Montgomery 1937 Forest Insect Survey).
Paratypes are in collections of the Florida Plant Board, Ohio State University, R. R. Dreisbach, Purdue University, the Atomic Energy Commission, and the author.
Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.
Lasioglossum (Dialictus) apocyni (Mitchell)
Dialictus apocyni Mitchell, 1960: 381. ♀.
Holotype. ♀ USA, West Virginia, Raleigh Co., 6.vi.1955, on Apocynum cannabinum; (H.V. Weems, Jr.); [FSCA]. Examined.
Taxonomy. Krombein, 1967: Lasioglossum (Dialictus) apocyni, p. 462 (catalogue); Moure and Hurd, 1987: Dialictus
apocyni, p. 90 (catalogue).
Diagnosis. Female L. apocyni can be recognised by the following diagnostic combination: clypeus flat, gena wider
than eye (Fig. 51A), hypostomal carinae parallel, and T1 acarinarial fan open dorsally (Fig. 52). In unworn specimens,
the mandible extends beyond the opposing clypeal angle. They are most similar to L. katherineae and L. fattigi, both of
which have clypeus less flat, gena subequal to eye, and in L. katherineae T1 acarinarial fan complete without dorsal opening.
Male L. apocyni can be recognised by the combination of head elongate (length/width ratio = 1.06–1.07); supraclypeal
area longer than wide; pronotal ridge strong but rounded; mesoscutum entirely imbricate, punctation sparse between
parapsidal lines (Fig. 54); metapostnotum posterior margin rounded onto posterior declivitous surface; and metasomal
terga with apical impressed areas impunctate. They are most similar to male L. fattigi, which have mesoscutum polished
submedially.
Description. FEMALE. Length 3.87–5.08 mm; head length 1.37–1.58 mm; head width 1.39–1.61 mm; forewing
length 3.03–3.63 mm.
Colouration. Head and mesosoma pale golden green, sometimes bluish. Clypeus with apical half blackish brown,
basal half and supraclypeal area sometimes golden. Antenna dark brown, flagellum with ventral surface dark reddish
brown. Tegula pale reddish brown to brownish yellow. Wing venation and pterostigma pale brownish yellow. Legs
brown, except medio- and distitarsi reddish brown. Metasoma brown, terga and sterna with apical margins translucent
brownish yellow.
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
virtually no tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5
OD). Metasomal terga with sparse, fine hairs. T1 acarinarial fan with narrow dorsal opening, not wider than lateral
hair patches. T2–T3 basolaterally and T4 entirely with sparse tomentum not obscuring surface. T2 apicolateral and
T3–T4 apical margins with sparse apical fringes.
Surface sculpture. Face weakly imbricate, punctation fine. Clypeus polished, punctation sparse (i=1–4d).
Supraclypeal area with punctation sparse (i=1–4d). Lower paraocular and antennocular areas with punctation
relatively sparse (i=1–2.5d). Upper paraocular area and frons contiguously punctate. Ocellocular area minutely,
obscurely punctate (i=1–1.5d). Gena weakly lineolate. Postgena weakly imbricate. Mesoscutum weakly tessellateimbricate,
punctation fine, moderately sparse between parapsidal lines (i=1–2d), dense laterad of parapsidal line
(i≤d), and reticulate on anterolateral portion. Mesoscutellum similar to mesoscutum, submedial punctation sparse
(i=1–3d). Axilla punctate. Metanotum imbricate. Preëpisternum weakly rugulose. Hypoepimeral area imbricate.
Mesepisternum weakly rugulose. Metepisternum dorsal ½ carinulate, lower ½ imbricate. Metapostnotum
incompletely rugoso-carinulate, posterior margin tessellate-imbricate. Propodeum with dorsolateral slope
imbricate, carinulate basally, lateral and posterior surfaces tessellate. Metasomal terga coriarious, T1 anterior
surface with distinct microsculpture, punctation on basal halves moderately dense (i=1–1.5d), obscure and
scattered on apical halves (i=2–2.5d), T1 dorsal portion and T2 apical half virtually impunctate.
Structure. Head round (length/width ratio = 0.98–0.99). Eyes weakly convergent below (UOD/LOD ratio =
1.11–1.18). Mandible often extending beyond opposing clypeal angle. Clypeus flat, ½ below suborbital tangent,
apicolateral margins strongly convergent. Antennal sockets moderately close (IAD/OAD < 0.6). Frontal line
carinate, ending 2.5OD below median ocellus. IOD subequal to OOD. Gena wider than eye. Pronotal ridge strong,
acarinate. Inner metatibial spur pectinate with 3 branches. Metapostnotum moderately elongate (MMR ratio =
1.40), posterior margin rounded onto posterior surface. Propodeum with oblique carina virtually absent, lateral
carina weak, reaching halfway to dorsal margin.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length. 4.30–5.26 mm;
head length. 1.32–1.49 mm; head width. 1.25–1.39 mm; forewing length. 2.96–3.32 mm.
Colouration. Flagellomeres with ventral surface orange-yellow. Legs brown, except tarsi brownish yellow.
Pubescence. Lower paraocular area with tomentum partially obscuring surface. Clypeus with scattered tomentum
not obscuring surface. Gena with sparse tomentum. S3–S5 with apicolateral patches of appressed hairs.
Surface sculpture. Clypeal punctation relatively dense (i=1–1.5d). Metanotum rugose. Preëpisternum and hypoepimeral
area rugulose. Metapostnotum with moderately strong rugae nearly reaching posterior margin. Propodeum with dorsolateral
slope rugose, lateral and posterior surfaces ruguloso-imbricate. Metasomal terga polished, punctation
moderately dense (i=1–2d) nearly reaching premarginal line, apical impressed areas impunctate.
Structure. Head elongate (length/width ratio = 1.06–1.07). Eyes strongly convergent below (UOD/LOD ratio = 1.58–
1.67). Supraclypeal area below antennal sockets longer than wide (length/width ratio = 1.2). Antennal sockets distant
(IAD/OAD > 1.4). Frontal line carinate, ending 2OD below median ocellus. Pedicel shorter than F1. F2 length 1.7X F1.
F2–F10 moderately elongate (length/width ratio = 1.64–1.81). Propodeum dorsal surface moderately elongate (MMR
ratio = 1.26), posterior margin rounded onto posterior surface.
Terminalia. Genital capsule as in Fig. 55. Gonobase with ventral arms widely separated. Gonostylus small, dorsal
setae elongate. Retrorse lobe elongate, attenuated apically.
Range. Indiana to West Virginia, south to Tennessee (Fig. 56). USA: IL, IN, KY, MS, OH, TN, VA, WV.
Additional material examined. USA: ILLINOIS: 1♀ Cook Co., Elgin, Bluff Springs Fen, 28.vi.2010 (L. Rericha);
[CUIC]; 1♀ Peoria Co., Peoria Heights, 19.viii.1968 (J.C. Marlin); 1♀ Tazewell Co., 3 mi N. Mackinaw, 10.vi.1969
(Webb & Marlin); 1♀ Woodford Co., 2 mi W Metamora, 16.viii.1968 (J.C. Marlin); [INHS]; INDIANA: 1♀ Morgan-
Monroe S.F., 14–16.vii.1937 (Montgomery 1937 Forest Insect Survey); [NCSU]; 1♀ Vigo Co., 11.v.1999 (R.P. Jean);
[PCYU]; MISSISSIPPI: 8♀♀ Pontotoc Co., 1 mi. SE Escru, 4.vi.1981 (M.O. Mann); [CUIC]; OHIO: 2♀♀ paratypes
Coshocton Co., 2.vi.1929 (J.S. Hine); [NCSU]; TENNESSEE: 1♀ Roane Co., 5.ix.1982 (O. Pellmyr); [CUIC]; VIRGINIA:
1♀ Eagle Rock, 18.vi.1957 (R.L. Fischer); [MSUC]; WEST VIRGINIA: 1♀ paratype Raleigh Co., 4.vi.1955
(H.V. Weems, Jr.); [AMNH]; 16♀♀ paratypes Raleigh Co., 6.vi.1955 (H.V. Weems, Jr.); [NCSU]; 1♀ paratype Raleigh
Co., 4.vi.1955 (H.V. Weems, Jr.); [NMNH]; 2♀♀ Hampshire Co., N39.34105 W078.4641, 29–30.v.2004 (S.W. Droege);
1♀ Hampshire Co., N39.23486 W078.7442, 11.vii.2005 (S.W. Droege); 1♀ Hampshire Co., N39.27931 W078.6809,
11.vii.2005 (S.W. Droege); 3♀♀ Hampshire Co., N39.3348 W078.458, 20.x (S.W. Droege); 1♂ Hampshire Co.,
N39.2489 W078.5256, 9.xi.2007 (V. Schoene); 3♀♀ 2♂♂ near Charleston, N38.41211 W081.64776, 15.viii.2006 (J.
Gibbs); [PCYU].
Floral records. APIACEAE: Daucus carota; APOCYNACEAE: Apocynum cannabinum; RANUNCULACEAE:
Actaea rubifolia.
DNA Barcode. Available. Multiple sequences. DNA barcodes do not clearly distinguish L. apocyni from L. fattigi or
L. paradmirandum.
Comments. Uncommon.
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