Lasioglossum (Dialictus) katherineae Gibbs

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216 : 124-129

Lasioglossum (Dialictus) katherineae Gibbs , new species

( Figures 140–144 )

Holotype. Ƥ USA, Iowa, Allamakee Co., Waymiller prairie, 12.5 km N. Lansing, N43˚27ˏ15ˏ W091˚18ˏ13ˏ, 323 m, 18.vii.2005 (C. Owens); [ PCYU]

Diagnosis. Female L. katherineae can be recognised by diagnostic combination of head relatively large, nearly quadrate (length/width ratio = 0.97–1.01); clypeus apicolateral margins strongly convergent; mesoscutum dull due to tessellate microsculpture, punctures sparse between parapsidal lines ( Fig. 141 ); mesepisternum rugulose; tegula brownish yellow; metapostnotal rugae not reaching posterior margin; T1 acarinarial fan large, without dorsal opening ( Fig. 141 ); metasomal terga with appressed tomentum. They are similar to L. apocyni , L. fattigi and L. paradmirandum but these species all have T1 acarinarial fan open dorsally.

Male L. katherineae are similar to females but lack T1 acarinarial fan. The large head (length/width ratio = 1.08) and brown metabasitarsus distinguish L. katherineae from male L. apocyni and L. fattigi .

Description. FEMALE. Length 4.48–4.84 mm; head length 1.37–1.57 mm; head width 1.40–1.56 mm; forewing length 3.09–3.81 mm.

Colouration. Head and mesosoma pale green to pale blue. Clypeus with apical half blackish brown, basal half and supraclypeal area sometimes golden. Antenna dark brown, flagellum with ventral surface reddish brown. Tegula amber. Wing membrane subhyaline, venation and pterostigma brownish yellow. Legs brown, except medio- and distitarsi reddish brown. Metasoma brown, terga and sterna with apical areas 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 large without dorsal opening. T2–T3 basolaterally and T4–T5 entirely with sparse tomentum not greatly obscuring surface. T2 apicolateral and T3–T4 apical margins with relatively dense apical fringes.

Surface sculpture. Face weakly imbricate, punctation moderately strong. Clypeus polished, punctation sparse (i=1– 3d). Supraclypeal area with punctation sparse (i=1–3d). Lower paraocular and antennocular areas with punctation moderately dense (i=1–1.5d). Upper paraocular area and frons reticulate-punctate. Ocellocular area minutely punctate (i=1– 1.5d). Gena weakly lineolate. Postgena polished, weakly imbricate. Mesoscutum weakly tessellate-imbricate, punctation fine, moderately dense between parapsidal lines (i=1–1.5d), 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 rugulose. Hypoepimeral area imbricate. Mesepisternum rugulose, posteriorly rugulose-imbricate. Metepisternum dorsal half rugoso-carinulate, ventral portion imbricate. Metapostnotum weakly rugosocarinulate not reaching posterior margin, imbricate posteriorly. Propodeum with dorsolateral slope imbricate, lateral surface imbricate-tessellate, and posterior surface tessellate. Metasomal terga polished except apical impressed areas coriarious, punctation on basal halves moderately dense (i=1–1.5d), obscure on apical halves (i=2–2.5d), T1 dorsal portion and T2 apical half virtually impunctate.

Structure. Head round (length/width ratio = 0.97–1.01). Eyes convergent below (UOD/LOD ratio = 1.21– 1.31). Clypeus 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 subequal to eye. Inner metatibial spur pectinate with 3–5 branches. Metapostnotum moderately elongate (MMR ratio = 1.32–1.40), 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 5.14 mm; head length 1.63 mm; head width 1.51 mm; forewing length 3.81 mm.

Colouration. Flagellomeres with ventral surface orange-yellow. Legs brown.

Pubescence. Face below eye emargination with moderately dense tomentum partially obscuring surface, denser on lower paraocular area. Metasomal terga with sparse basolateral tomentum. S2–S5 with moderately dense apicolateral patches of erect hairs.

Surface sculpture. Clypeal punctation relatively dense (i=1–1.5d). Metanotum rugose. 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), apical impressed areas impunctate.

Structure. Head elongate (length/width ratio = 1.08). Eyes strongly convergent below (UOD/LOD ratio = 1.50). Antennal sockets distant (IAD/OAD> 1.2). Frontal line carinate, ending 2OD below median ocellus. Pedicel shorter than F1. F2 length 1.8X F1. F2–F10 moderately elongate (length/width ratio = 1.57–1.71). Propodeum dorsal surface moderately elongate (MMR ratio = 1.27), posterior margin rounded onto posterior surface.

Terminalia . S7 with median lobe clavate, apex rounded ( Fig. 144 ). S8 with apicomedial margin weakly convex ( Fig. 144 ). Genital capsule as in Fig. 144 . Gonobase with ventral arms widely separated. Volsella roughly ovoid. Gonostylus small, dorsal setae elongate. Retrorse lobe elongate, attenuated apically.

Range. Massachusetts west to Iowa ( Fig. 139 ). USA: GA, IA, MA, ME, NC, NY, WI.

Allotype. 3 USA: MASSACHUSETTS: Franklin Co., Montague WMA, powerline corridor 10033, N42.56297 W072.52999, 6.x.2009 (J. Milam) on Solidago rugosa ; [PCYU].

Paratypes. USA: GEORGIA: 1Ƥ Hiawassee, 19.viii.1957 (L.A. Kelton); [CNC]; IOWA: 1Ƥ Allamakee Co., Capoli prairie, 8.2 km S. Lansing, N43˚19ʹ29ʹʹ W091˚8ʹ4ʹʹ, 91 m, 19.vi.2005 (C. Owens); 1Ƥ Allamakee Co., Mullen prairie, 6.6 km S. Lansing, N43˚19ʹ14ʹʹ W091˚9ʹ32ʹʹ, 305 m, 14.viii.2005 (R. Kay); [PCYU]; MAINE: 1Ƥ Deblois, 6.vi.1965 (E.A. Osgood); 2ƤƤ Kennebunk, 5.vi.1952; [UMDE]; MASSACHUSETTS: 1Ƥ Franklin Co., Montague WMA, N42.56321 W072.53181, 1–2.v.2008 (J. Milam); 1Ƥ Franklin Co., Montague WMA, N42.57205 W072.5227, 7–8.x.2008 (J. Milam); 1Ƥ Franklin Co., Montague WMA, 20.vii.2006 (M.F. Veit); [PCYU]; 13 Franklin Co., Montague WMA, Pt. 42, treated pitch-pine, N42.56321 W072.53181, 20–21.x.2009 (J. Milam); 1Ƥ Franklin Co., Montague WMA, Pt. 56, treated pitch-pine, N42.56212 W072.51859, 14–15.vii.2009 (J. Milam); 5ƤƤ Franklin Co., Montague WMA, Pt. 56, treated pitch-pine, N42.56212 W072.51859, 22–23.vii.2009 (J. Milam); 2ƤƤ13 Franklin Co., Montague WMA, Pt. 56, treated pitch-pine, N42.56212 W072.51859, 20–21.x.2009 (J. Milam); 4ƤƤ Franklin Co., Montague WMA, Pt. 90, treated pitch-pine, N42.57012 W072.52245, 18–19.viii.2010 (J. Milam); 1Ƥ Franklin Co., Montague WMA, Pt. 90, treated pitch-pine, N42.57012 W072.52245, 20–21.x.2010 (J. Milam); 1Ƥ Franklin Co., Montague WMA, Pt. 93, treated pitch-pine, N42.5638 W072.5336, 27–28.iv.2009 (J. Milam); 2ƤƤ Franklin Co., Montague WMA, Pt. 93, treated pitch-pine, N42.5638 W072.5336, 24–25.vi.2009 (J. Milam); 13 Franklin Co., Montague WMA, Pt. 108, treated pitch-pine, N42. 56767 W072.51897, 2–5.x.2009 (J. Milam); 1Ƥ Franklin Co., Montague WMA, Pt. 119, treated pitch-pine, N42.55853 W072.52180, 14–15.vii.2009 (J. Milam); 13 Franklin Co., Montague WMA, Pt. 119, treated pitch-pine, N42.55853 W072.52180, 5–6.x.2009 (J. Milam); 13 Franklin Co., Montague WMA, roadside nr. Pt. 119, treated pitch-pine, N42.55787 W072.52234, 5.x.2009 (J. Milam); 13 Franklin Co., Montague WMA, roadside nr. Pt. 119, treated pitch-pine, N42.55787 W072.52234, 6.x.2009 (J. Milam); 4ƤƤ13 Franklin Co., Montague WMA, powerline corridor #1, N42.56297 W072.52999, 5–6.x.2009 (J. Milam); 1Ƥ Franklin Co., Montague WMA, gravel pit #4, N42.56862 W072.53409, 18–19.viii.2010 (J. Milam); 2ƤƤ Franklin Co., Montague WMA, Pt. B, scrub/shrub, N42.56690 W072.53323, 1–2.v.2008 (J. Milam); 1Ƥ Franklin Co., Montague WMA, Pt. B, scrub/oak, N42.5669 W072.5332, 14–15.ix.2009 (J. Milam); 1Ƥ Franklin Co., Montague WMA, Pt. I, treated pitch-pine, N42.57205 W072.52270, 1–2.vii.2010 (J. Milam); 1Ƥ Franklin Co., Montague WMA, Pt. I, treated pitch-pine, N42.57029 W072.51985, 20–21.x.2009 (J. Milam); 1Ƥ Franklin Co., Wendell S.F., powerline corridor, N42.56955 W072.41493, 22–23.x.2009 (D. King); [CUIC] NEW YORK: 1Ƥ Central Park, 28.vi.1918; 1Ƥ Flatbush, 18.viii.1903 (J.L. Zabsiskie); 1Ƥ Orange Co., Cornwall, Black Rock Forest, 18 N4582302 E580161, 8.vii.2003 (V. Giles & J. Rozen); 1Ƥ Orange Co., Cornwall, Black Rock Forest, 18 N4582302 E580161, 26.vii.2003 (V. Giles & J. Rozen); 1Ƥ Otsego Co., Oneonta, Soccer Hall of Fame, 5.vii.2002 (J.S. Ascher); 1Ƥ Rensselaer Co., Brainard, 11–22.vii.1966 (P. & B. Wygodzinksy); 1Ƥ Ulster Co., Cherrytown, 4 mi NNW Kerhonkson, 15–30.vi.1971 (P. & B. Wygodzinsky); [AMNH]; 1Ƥ Albany Co., Rensselaerville, Huyck Preserve, 9.viii.1969 (G. & K. Eickwort); 1Ƥ Nassau Co., Valley Stream S.P., 2.vii.1974 (G.C. Eickwort); 1Ƥ Schulayer Co., W. Of Reynoldsville, Hector land use area, 28.vii.1968 (G. & K. Eickwort); [CUIC]; NORTH CAROLINA: 1Ƥ Bryson City, 14.iv.1923 (J.C. Crawford); 1Ƥ Bryson City, 25.iii.1923 (J.C. Crawford); 1Ƥ Bryson City, 15.iv.1923 (J.C. Crawford); WISCONSIN: 1Ƥ Sauk Co., T8N/R4E/Sec6/NE, 23.viii.1994 (TNC/DNR Study 053); [IRCW].

Floral records. ASTERACEAE : Solidago rugosa ; CLUSIACEAE : Hypericum ; ERICACEAE : Vaccinium .

Etymology. The specific epithet is named for Katherine Milam King whose mother collected the majority of specimens known.

DNA Barcode. Available. Multiple sequences.

Comments. Uncommon. The species has been uncommonly collected except in the Montague Plains Wildlife Management Area, Franklin County, Massachusetts where is has been collected in large numbers. The Montague Plains Wildlife Management Area is a pitch pine- scrub oak barren. The species may have particular habitat preferences that preclude its routine collection.

Figures

FIGURE 139. Distribution map of Lasioglossum izawsum (circles) and L. katherineae (stars).

FIGURE 140. Lasioglossum katherineae Gibbs female, (A) lateral habitus, (B) face. Scale bars = 1 mm.

FIGURE 141. Lasioglossum katherineae Gibbs female, dorsal view of mesosoma.

FIGURE 142. Lasioglossum katherineae Gibbs male, (A) lateral habitus, (B) face. Scale bars = 1 mm.

FIGURE 143. Lasioglossum katherineae Gibbs male, dorsal view of mesosoma.

FIGURE 144. Lasioglossum katherineae Gibbs, new species male terminalia, (A) ventral view, (B) dorsal view. Scale bar = 0.5 mm.