Physotarsus glabellus 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 : 30-31

Physotarsus glabellus Zhaurova , n. sp. ( Figs 38, 39 )

Diagnosis. Lateral ocelli separated by 0.4X their widest diameter from each other and about 1.8X their widest diameter from eye margin. Antenna with 22–23 flagellomeres. Pronotum and mesoscutum shiny, impunctate. T1 about 1.5X as long as broad. Clypeus light yellowish to white, face yellow to pale orange, frons varying from mostly pale orange to entirely brown; occiput orange. Mesosoma pale orange above, fading to nearly white ventrally. Metasoma with T1 entirely brown, remaining tergites mostly brown with yellow apical margin. Fore and mid legs yellow. Most of hind femur and tibia yellow, with extreme apices brownish; tarsomeres dark brown to black. Fore wing hyaline, apex dusky.

Physotarsus glabellus is similar to several other smooth-bodied species that have hyaline wings with an infumate apical spot, most notably P. eliethi , P. j a m e s i, P. leucohypopygus , P. niveus , and P. oculatus . As in P. jamesi and to some extent P. eliethi the hind femur is entirely or almost entirely dark yellow to orange in P. glabellus . T1 is dark brown in P. glabellus but orange or mostly orange in P. j a m e s i and P. eliethi has the first flagellomere about 10X longer than wide.

Description. Female: Body ( Fig. 38 ) 3.7–4.0 mm, fore wing 3.7 mm. Head ( Fig. 39 ): Clypeal margin widely rounded laterally, with thick, weakly angulate central lobe. Clypeus about 2.7X as wide as long, divided medially by shallow transverse depression. Face covered with short setae; setae longer, slightly 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 flat, area immediately behind antenna weakly concave laterally, turning convex 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 0.4X their widest diameter from each other and about 1.8X their widest diameter from eye margin. Area between lateral ocelli flat, area behind ocelli sharply declivitous. Antenna with 22–23 flagellomeres, first flagellomere 3.9–4.3X longer than wide, about equal widest transverse diameter 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 unsculptured, indistinct over dorsal 0.3. Pronotum and mesoscutum glabrous, shiny, impunctate. Epicnemial carina strongly angled towards anterior margin of mesopleuron. Mesopleuron impunctate, sparsely pubescent on ventral half. Metapleuron moderately but not uniformly setose. Propodeum with posterior vestiges of median longitudinal carina, pleural carina absent; impunctate medially, sparsely pubescent laterally. Tarsal claws with stout setae basally. Fore wing stigma about 4.0X longer than wide; Rs+2r arising from basal 0.4 of stigma; marginal cell about 2.8X longer than wide; 2rs-m usually 1.2–1.4X longer than abscissa of M between 2rs-m and 2m-cu; Cu1a about 0.4X length of 2cu-a; cu-a interstitital relative to Rs&M. Hind wing M+Cu very strongly bowed; basal abscissa of Rs equal in length to rs-m; 1st abscissa of Cu1 1.7–1.8X longer than cu-a. Metasoma: T1 about 1.5X as long as broad; surface in profile almost completely flat, dorsal tendon anchored within small, shallow, relatively discrete depression, spiracles protruding in profile; dorsolateral carina approximately half distance to spiracle. Cerci distinct, weakly protruding.

Color. Head with clypeus light yellowish to white, face yellow to pale orange, frons varying from mostly pale orange to entirely brown; occiput orange. Antenna brown, slightly lighter basally. Mesosoma pale orange above, fading to nearly white ventrally. Metasoma with T1 entirely brown, rest of tergites mostly brown with yellow apical trim; sternites brownish-yellow. Fore and mid legs white basally, yellow distally. Hind coxa, trochanter, trochantellus, most of hind femur and tibia yellow, apices of femur and tibia brownish, tarsomeres dark brown to black. Cerci light brown. Fore wing hyaline, apex dusky.

Male: Unknown.

Material Examined. Holotype Ψ ( AEIC, Type No. 3855): [ BRAZIL, Pernambuco] first line of data label: “Caruaru, Brazil ” second line: “ Apr. 1972 900 m. ” third line: “M Alvarenga”. Paratype: 1 Ψ, same data as holotype.

Remarks. The epicnemial carina is difficult to see in the available specimens of P. glabellus . This species was therefore run to two different places in the key.

The species name is derived from Latin and refers to the small body with greatly reduced setae. This species is known only from east-central Brazil.

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.