Physotarsus leucohypopygus Zhaurova

Zhaurova, Kira & Wharton, Robert, 2009, A revision of Physotarsus Townes (Hymenoptera: Ichneumonidae: Ctenopelmatinae), with description of 18 new species, Zootaxa 2207, pp. 1-52 : 33-34

Physotarsus leucohypopygus Zhaurova , n. sp. ( Figs 40 , 41 )

Diagnosis. Lateral ocelli separated by 0.9–1.0X their widest diameter from each other and about 1.7X their widest diameter from eye margin. Antenna with 24 flagellomeres. Pronotum and mesoscutum shiny, impunctate. T1 about 2.2X as long as broad. Head and mesosoma entirely dark yellow. Metasomal tergites brown with thin white apical trim. Hind leg dark brown. Fore wing hyaline, apex fuscous.

Physotarsus leucohypopygus is similar to several other smooth-bodied species that have hyaline wings with an infumate apical spot, most notably P. eliethi , P. glabellus , P. j a m e s i, P. niveus , and P. oculatus . As in P. n i v e u s and P. oculatus the hind femur on the outer or anterior face is entirely or almost entirely dark brown to black in P. leucohypopygus . The ocellar field is dark brown in P. oculatus but the head above is completely orange in P. leucohypopygus and P. niveus . The propodeum is entirely orange in P. leucohypopygus but dark brown anteriorly and white posteriorly in P. niveus .

Description. Female: Body ( Fig. 40 ) 4.4–4.6 mm, fore wing 4.6–4.8 mm. Head ( Fig. 41 ): Clypeal margin widely rounded laterally, with thick, somewhat angulate central lobe. Clypeus about 2.6X as wide as long, not divided medially by transverse depression. Face sparsely covered with short setae; setae slightly longer, less dense on clypeus. Anterior tentorial pits oval. Malar space 0.5–0.6X width of mandibular base.

Face about 1.5X as broad as long, very weakly convex in profile, nearly flat, smooth. Interantennal area slightly concave, area immediately behind antenna weakly concave, turning convex laterally before reaching ocelli. Anterior margin of torulus situated at about 0.8 of eye height. Interantennal distance greater than the distance between lateral ocelli. Widest diameter of torulus about 1.2X widest diameter of median ocellus. Lateral ocelli separated by 0.9–1.0X their widest diameter from each other and about 1.7X their widest diameter from eye margin. Area between lateral ocelli flat to slightly depressed, area behind ocelli sharply declivitous. Antenna with 24 flagellomeres, first flagellomere 6.1–6.6X longer than wide, about equal widest diamteter of eye, second flagellomere about 0.7X length of first. Occipital carina present on ventral 0.4 of head. Mesosoma: Anterior margin of pronotum medially emarginate, laterally truncate, upcurved. Lateral groove of pronotum present, weakly sculptured on dorsal 0.3. Pronotum and mesoscutum shiny, impunctate. Epicnemial carina strongly angled towards anterior margin of mesopleuron. Mesopleuron impunctate, sparsely pubescent on the ventral half. Metapleuron sparsely setose. Propodeum with complete pleural carinae; impunctate medially, sparsely pubescent laterally. Tarsal claws with stout setae basally. Fore wing stigma narrow, about 4.2–4.5X longer than wide; Rs+2r arising from basal 0.3–0.4 of stigma; marginal cell about 2.6X longer than wide; 2rs-m 1.3–1.4X longer than abscissa of M between 2rs-m and 2m-cu; Cu1a about 0.4X length of 2cu-a; cu-a weakly but distinctly antefurcal relative to Rs&M. Hind wing M+Cu strongly bowed; basal abscissa of Rs 1.2–1.4X longer than rs-m; 1st abscissa of Cu1 1.6–2.1X longer than cu- a. Metasoma: T1 about 2.2X as long as broad; surface in profile flat basally, weakly convex posteriorly, dorsal tendon anchored within small, relatively discrete depression; spiracles protruding in profile; dorsolateral carina extending about half distance to spiracle. Cerci distinct, round to slightly ovate, weakly protruding. Female subgenital plate widely rounded, larger than usual.

Color. Head and mesosoma entirely dark yellow. Antennae brown, except yellow-brown ventrally at base. Metasomal tergites brown with narrow white trim, sternites white. Subgenital plate white with narrow brown apical margin. Cerci light brown. Fore and mid legs dark yellow except tarsomeres of mid leg brownish. Hind leg entirely dark brown to black. Fore wing hyaline, apex fuscous.

Male: Unknown.

Material Examined. Holotype Ψ ( AEIC, Type No. 3856): [ BRAZIL, Pernambuco] first line of data label: “Caruaru, Brazil ” second line: “ VII.1972 900 m. ” third line: “J. Lima”. Paratype: 1 Ψ, same data as holotype ( AEIC).

Remarks. This species is very similar to P. glabellus , collected from the same locality. In addition to the diagnostic features noted above, the first flagellomere is relatively longer and narrower in P. leucohypopygus , the hind legs are much darker, and the venation is slightly different, with fore wing cu-a distinctly antefurcal.

The species name is derived from Greek, in reference to the predominately white hypopygium.

Figures

FIGURES 37 – 40. Habitus and face. 37, Physotarsus gineus n. sp., face. 38 – 39, P. glabellus n. sp.; 38, habitus; 39, face. 40, P. leucohypopygus, n. sp., habitus.

FIGURES 41 – 44. Habitus and face. 41, Physotarsus leucohypopygus, n. sp., face. 42 – 43, P. lu t eu s n. sp.; 42, habitus; 43, face. 44, P. maculipennis, habitus.