Physotarsus oculatus 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 : 44-45

Physotarsus oculatus Zhaurova , n. sp. ( Figs 52 , 53 )

Diagnosis. Lateral ocelli separated by about 0.8X their widest diameter from each other and about 1.5X their widest diameter from eye margin. Antenna with 27 flagellomeres. Pronotum and mesoscutum impunctate, shiny. T1 about 2.2X as long as broad. Face white or very light yellow; ocellar area dark brown, lateral frons and occiput orange. Mesosoma with pronotum brown anteriorly, white posteriorly; mesoscutum and scutellum orange; mesopleuron white; propodeum white with two anterolateral brown spots. Metasomal tergites brown with apical margins white, sternites white. Hind legs entirely black. Fore wing hyaline, apex infumate to nearly fuscous.

Physotarsus oculatus is similar to several other smooth-bodied species that have hyaline wings with an infumate apical spot, most notably P. eliethi , P. g l a b e l l u s, P. j a m e s i, P. leucohypopygus , and P. n i v e u s. As in P. leucohypopygus and P. n i v e u s the hind femur on the outer or anterior face is entirely or almost entirely dark brown to black in P. oculatus but unlike the other two species, the ocellar field is dark brown in P. oculatus .

Description. Female: Body ( Fig. 52 ) 4.4–4.7 mm, fore wing 4.0– 4.3 mm. Head ( Fig. 53 ): Clypeal margin widely truncate laterally with thick, somewhat angulate central lobe. Clypeus about 3.4X as wide as long, separated medially by shallow transverse depression. Face covered with short setae; setae longer, less dense on clypeus. Anterior tentorial pits elongate, pointed laterally. Malar space about 0.5X width of mandibular base. Face about 1.4X as broad as long, nearly flat, weakly convex dorsally, sparsely, evenly punctate. Interantennal area flat, area immediately behind antennae weakly concave laterally, turning convex before reaching ocelli. Anterior margin of torulus situated at about 0.7 of eye height. Interantennal distance greater than distance between lateral ocelli. Widest diameter of torulus about equal widest diameter of median ocellus. Lateral ocelli separated by about 0.8X their widest diameter from each other and about 1.5X their widest diameter from eye margin. Area between lateral ocelli slightly depressed, area immediately behind ocelli sharply declivitous. Antenna with 27 flagellomeres, first flagellomere 4.4-4.8X longer than wide, about 0.7X widest 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 strongly emarginate medially, laterally truncate and slightly upcurved. Lateral groove of pronotum weak, unsculptured, present on dorsal 0.4. Pronotum and mesoscutum glabrous, impunctate, shiny. Epicnemial carina strongly angled towards anterior margin of mesopleuron. Mesopleuron shiny, very sparsely punctate on ventral 0.7. Metapleuron unevenly setose. Propodeum with posterior vestige of pleural carina; impunctate medially, sparsely pubescent laterally. Tarsal claws with stout setae basally. Fore wing stigma narrow, about 4.3X longer than wide; Rs+2r arising from basal 0.4 of stigma; marginal cell about 2.9X longer than wide; 2rs-m usually 1.9–2.1X longer than abscissa of M between 2rs-m and 2m-cu; Cu1a about 0.4X length of 2cu-a; cu-a weakly antefurcal relative to Rs&M. Hind wing M+Cu bowed to strongly bowed; basal abscissa of Rs 1.4X length longer than rs-m; 1st abscissa of Cu1 about 3.2–4.2X longer than cu-a. Metasoma: T1 about 2.2X as long as broad; surface in profile flat for most of length, very weakly convex posteriorly, dorsal tendon anchored within small, relatively discrete depression; spiracles weakly protruding in profile. Subgenital plate widely rounded, larger than usual. Cerci not protruding.

Color. Face white or very light yellow; ocellar area dark brown, lateral frons and occiput orange. Antenna uniformly yellowish. Mesosoma with anterior part of pronotum brown; posterior part white; mesoscutum and scutellum orange; mesopleuron white; propodeum white with two lateral brown spots. Metasomal tergites brown with white margins, sternites white. Subgenital plate white with thin brown apical margin. Cerci brown. Fore legs yellow, mid legs yellow with black tarsomeres. Hind legs entirely black. Fore wing hyaline, apex infumate to nearly fuscous.

Male: Unknown.

Material Examined. Holotype Ψ ( AEIC, Type No. 3859): [ BRAZIL, Pará] first line of data label: “Jacareacanga” second line: “Pará, Braz. XII-68 ” third line: “Moacir Alvarenga”. Paratype: 1 Ψ, same data as holotype ( AEIC).

Remarks. The species name is derived from Latin, referring to the large, bulging eyes. This is Physotarsus species 2 in the analyses conducted by Zhaurova and Wharton (2009).

Figures

FIGURES 49 – 52. Habitus and face. 49, Physotarsus melotarsus n. sp., face. 50 – 51, P. niveus n. sp.; 50, habitus; 51, face. 52, P. oculatus n. sp., habitus.

FIGURES 53 – 56. Habitus and face. 53, Physotarsus oculatus n. sp., face. 54 – 56, P. to nicu s n. sp.; 54, habitus; 55, face Ψ; 56, face ♂.