Lasioglossum (Dialictus) marinense (Michener)

Gibbs, Jason, 2010, Revision of the metallic species of Lasioglossum (Dialictus) in Canada (Hymenoptera, Halictidae, Halictini) 2591, Zootaxa 2591 (1), pp. 1-382 : 188-191

Lasioglossum (Dialictus) marinense (Michener)

( Figure 142A–C )

Halictus (Chloralictus) marinensis Michener, 1936: 167 ♀. Holotype. ♀ USA, California, Marin Co., Lagunitas , 7.viii.1921 (E.P. Van Duzee); [CAS: 4202]. Examined.

Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) marinense , p. 1115 (catalogue); Hurd, 1979: Dialictus marinensis , p. 1968 (catalogue); Moure & Hurd, 1987: Dialictus marinense , p. 112 (catalogue).

Diagnosis. Similar to L. laevissimum and L. pacatum . See the diagnosis for those species.

Redescription. FEMALE. Length 5.25–7.20 mm; head length 1.56–1.70 mm; head width 1.63–1.73 mm; forewing length 4.27–4.76 mm.

Colouration. Head and mesosoma blue with some green or golden reflections. Clypeus with apical half blackish brown and basal half, and supraclypeal area greenish. Antenna dark brown, flagellum with ventral surface reddish brown. Tegula dark reddish brown. Wing membrane subhyaline, venation and pterostigma yellowish brown. Legs brown, medio- and distitarsi, and metabasitarsal base reddish brown. Metasoma dark brown, terga and sterna with apical margins of reddish to yellowish brown.

Pubescence. Dull white. Sparse. Head and mesosoma with moderately sparse woolly hairs (1–1.5 OD), longest on genal beard, metanotum and mesopleuron (2–2.5 OD). Lower paraocular area and gena without subappressed tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with very sparse, fine setae and no tomentum. T1 acarinarial fan small with wide dorsal opening.

Surface sculpture. Face imbricate, punctation moderately strong. Clypeus with apical half polished, punctation moderately sparse (i=1–2.5d). Supraclypeal area with punctation moderately sparse (i=1–2.5d). Lower paraocular area punctation moderately dense (i=0.5–1.5d). Antennocular area punctation moderately sparse (i=1–2d). Upper paraocular area and frons punctate-reticulate. Ocellocular area obscurely punctate (i≤d). Gena lineolate. Postgena polished laterad, imbricate mesad. Mesoscutum imbricate, punctation moderately fine, moderately sparse between parapsidal lines (i=1–2.5d), dense laterad of parapsidal lines (i≤d), contiguous on anterolateral portion. Mesoscutellum similar to mesoscutum, submedial portion punctation moderately sparse (i=1–3d). Axilla punctate. Metanotum imbricate. Preëpisternum rugulose. Hypoepimeral area weakly rugulose. Mesepisternum dorsal portion rugulose, ventral portion weakly ruguloso-imbricate, obscurely punctate. Metepisternum with dorsal half rugoso-striate, ventral half imbricate. Metapostnotum rugoso-striate reaching posterior margin. Propodeum with dorsolateral slope rugulose, lateral surface imbricate-rugulose, posterior surface rugulose. Metasomal terga polished except apical margins weakly coriarious, punctation on basal halves distinct (i=1–1.5d), apical impressed areasa sparsely and obscurely punctate (i=2–6d).

Structure. Head moderately wide (length/width ratio = 0.96–0.99). Clypeus 1/2 below suborbital line, apicolateral margins convergent. Eyes weakly convergent below (UOD/LOD ratio = 1.16–1.19). Antennal sockets close (IAD/OAD ratio = 0.5). OOD less than IOD. Median ocellus at level of upper orbital tangent. Gena narrower than eye. Inner metatibial spur pectinate with 3–5 teeth. Metapostnotum moderately elongate (MMR ratio = 1.14–1.21), posterior margin sharply angled onto posterior surface. Propodeum with oblique carina weak, lateral carina moderately strong, nearly reaching dorsal margin.

MALE. Unknown.

Range. British Columbia south to central California ( Fig. 143 ).

Additional material examined. CANADA: BRITISH COLUMBIA: 1♀ Cowichan River P.P., 10 km E Lake Cowichan, N48°46´39´´ W123°56´30.2´´, 12.vi.2005 (E. Elle) ; 1♀ Cowichan River P.P., 10 km E Lake Cowichan, N48°46´39´´ W123°56´30.2´´, 25.vi.2005 (E. Elle) ; 1♀ Cowichan River P.P., 10 km E Lake Cowichan, N48°46´39´´ W123°56´30.2´´, 13.vii.2005 (E. Elle) ; 1♀ Cowichan Lake Forestry Stn., Ministry of Forests, Mesachie Lake , N48°49´07.9´´ W124°08´05.1´´, 28.vi.2005 (E. Elle) ; 1♀ Elk Falls P.P., 6 km W Campbell River, N50°02´34.9´´ W125°19´32´´, 26.vii.2005 (E. Elle); [ PCYU] ; USA: WASHINGTON: 1♀ Okanagan Co., 1 mi E Muckamuck Hill , 11U N5386867 E296155, 9.viii.2004 (J. Wilson) ; 1♀ Okanagan Co., 1 mi NW Turner Lake , 11U N5393911 E252078, 29.vi.2004 (J. Wilson); [ PCYU] .

Comments. Rare. There is a second species known from high elevations (> 1861 m) in Yosemite National Park, California which is extremely similar to L. marinense . The holotype of H. marinensis seems more similar to the Canadian specimens than the Yosemite material. Recently collected material near the type locality could not be barcoded to verify the proper association of the species name.

Figures

FIGURE 142. Lasioglossum marinense (Michener). Female (A) lateral habitus; (B) dorsal habitus; (C) face. Scale bars, A–C = 1 mm.

FIGURE 143. Distribution of Lasioglossum marinense (medium grey), L. michiganense (dark grey), and L. mitchelli (light grey).