Lasioglossum (Dialictus) apocyni (Mitchell)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216 : 45-49

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Lasioglossum (Dialictus) apocyni (Mitchell)


Lasioglossum (Dialictus) apocyni (Mitchell)

( Figures 51–55 View FIGURE 51 View FIGURE 52 View FIGURE 53 View FIGURE 54 View FIGURE 55 )

Dialictus apocyni Mitchell, 1960: 381 . Ƥ.

Holotype. Ƥ USA, West Virginia, Raleigh Co., 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. 51 View FIGURE 51 A), hypostomal carinae parallel, and T 1 acarinarial fan open dorsally ( Fig. 52 View FIGURE 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 T 1 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 View FIGURE 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. T 1 acarinarial fan with narrow dorsal opening, not wider than lateral hair patches. T 2 –T 3 basolaterally and T 4 entirely with sparse tomentum not obscuring surface. T 2 apicolateral and T 3 –T 4 apical margins with sparse apical fringes.

Surface sculpture. Face weakly imbricate, punctation fine. Clypeus polished, punctation sparse (i= 1–4 d). Supraclypeal area with punctation sparse (i= 1–4 d). Lower paraocular and antennocular areas with punctation relatively sparse (i= 1–2.5 d). Upper paraocular area and frons contiguously punctate. Ocellocular area minutely, obscurely punctate (i= 1–1.5 d). Gena weakly lineolate. Postgena weakly imbricate. Mesoscutum weakly tessellateimbricate, punctation fine, moderately sparse between parapsidal lines (i= 1–2 d), dense laterad of parapsidal line (i≤d), and reticulate on anterolateral portion. Mesoscutellum similar to mesoscutum, submedial punctation sparse (i= 1–3 d). 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, T 1 anterior surface with distinct microsculpture, punctation on basal halves moderately dense (i= 1–1.5 d), obscure and scattered on apical halves (i= 2–2.5 d), T 1 dorsal portion and T 2 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 2.5 OD 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. S 3 –S 5 with apicolateral patches of appressed hairs.

Surface sculpture. Clypeal punctation relatively dense (i= 1–1.5 d). 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= 1–2 d) 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 2 OD below median ocellus. Pedicel shorter than F 1. F 2 length 1.7 X F 1. F 2 –F 10 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 View FIGURE 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 View FIGURE 56 ). USA: IL, IN, KY, MS, OH, TN, VA, WV.

Additional material examined. USA: ILLINOIS: 1 Ƥ Cook Co., Elgin, Bluff Springs Fen, 2010 (L. Rericha); [ CUIC]; 1 Ƥ Peoria Co., Peoria Heights, 19.viii. 1968 (J.C. Marlin); 1 Ƥ Tazewell Co., 3 mi N. Mackinaw, 1969 (Webb & Marlin); 1 Ƥ Woodford Co., 2 mi W Metamora, 16.viii. 1968 (J.C. Marlin); [ INHS]; INDIANA: 1 Ƥ Morgan- Monroe S.F., 14–16.vii. 1937 (Montgomery 1937 Forest Insect Survey); [ NCSU]; 1 Ƥ Vigo Co., 11.v. 1999 (R.P. Jean); [ PCYU]; MISSISSIPPI: 8 ƤƤ Pontotoc Co., 1 mi. SE Escru, 1981 (M. O. Mann); [ CUIC]; OHIO: 2 ƤƤ paratypes Coshocton Co., 1929 (J.S. Hine); [ NCSU]; TENNESSEE: 1 Ƥ Roane Co., 5.ix. 1982 ( O. Pellmyr); [ CUIC]; VIR- GINIA: 1 Ƥ Eagle Rock, 1957 (R.L. Fischer); [ MSUC]; WEST VIRGINIA: 1 Ƥ paratype Raleigh Co., 1955 (H.V. Weems, Jr.); [ AMNH]; 16 ƤƤ paratypes Raleigh Co., 1955 (H.V. Weems, Jr.); [ NCSU]; 1 Ƥ paratype Raleigh Co., 1955 (H.V. Weems, Jr.); [ NMNH]; 2 ƤƤ Hampshire Co., N 39.34105 W078.4641, 29–30.v. 2004 (S.W. Droege); 1 Ƥ Hampshire Co., N 39.23486 W078.7442, 11.vii. 2005 (S.W. Droege); 1 Ƥ Hampshire Co., N 39.27931 W078.6809, 11.vii. 2005 (S.W. Droege); 3 ƤƤ Hampshire Co., N 39.3348 W078.458, 20.x (S.W. Droege); 13 Hampshire Co., N 39.2489 W078.5256, 9.xi. 2007 (V. Schoene); 3 ƤƤ 233 near Charleston, N 38.41211 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.


Florida State Collection of Arthropods, The Museum of Entomology


Cornell University Insect Collection


Illinois Natural History Survey


North Carolina State University Insect Museum


The Packer Collection at York University


American Museum of Natural History


Smithsonian Institution, National Museum of Natural History


Department of Natural Resources, Environment, The Arts and Sport














Lasioglossum (Dialictus) apocyni (Mitchell)

Gibbs, Jason 2011

Dialictus apocyni

Mitchell 1960: 381