Physotarsus emarginatus 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 : 23-25

Physotarsus emarginatus Zhaurova , n. sp. ( Figs 29–31 )

Diagnosis. Lateral ocelli separated by 1.0–1.2X their widest diameter from each other and 1.5–1.7X their widest diameter from eye margin. Antenna with 35–38 flagellomeres. Pronotum completely glabrous. Mesoscutum shiny, very sparsely punctate on anterior 0.3. T1 about twice as long as broad. Head yellow with black median stripe on frons and vertex; occiput black. Mesosoma black and yellow ( Fig. 29 ). T1 yellow basally with two black bands extending from spiracle to apex; T2 and often T3 with yellow triangular patch medially, otherwise dark brown to black, remaining tergites largely dark laterally, variously yellow to orange medially. Hind femur and tibia orange, tarsomeres dark orange to brown, usually darker dorsally. Fore wing entirely hyaline.

Physotarsus emarginatus is one of several species with a black and yellow mesosoma, a distinctly punctate mesopleuron, and a sparsely to impunctate mesoscutum. It is nearly identical to P. cordatus and P. truncatus , but the mesoscutum and mesopleuron are more extensively black in P. truncatus and the metasomal tergites distad the petiole are more uniformly orange in P. cordatus . All three species have a deeply emarginate male subgenital plate.

Description. Female: Body ( Fig. 29 ) 3.9–5.0 mm, fore wing 3.8–5.0 mm. Head ( Fig. 30 ): Clypeal margin widely subtruncate laterally, with thick, rounded central lobe. Clypeus about 2.6–2.8X as wide as long, divided medially by very shallow transverse depression. Face covered with very short setae; setae longer, slightly less dense on clypeus. Anterior tentorial pits elongate and upcurved laterally. Malar space 0.5–0.6X width of mandibular base. Face 2.0–2.2X as broad as long, slightly to moderately protruding dorsally in profile, evenly sparsely punctate. Interantennal area flat, area immediately behind antennae weakly concave laterally turning convex before reaching ocelli. Anterior margin of torulus situated at about 0.8 of eye height. Interantennal distance greater than distance between lateral ocelli. Widest diameter of median ocellus about equal widest diameter of torulus. Lateral ocelli separated by 1.0–1.2X their widest diameter from each other and 1.5–1.7X their widest diameter from eye margin. Area between lateral ocelli slightly depressed, area immediately behind ocelli not sharply declivitous. Antenna with 35–38 flagellomeres, first flagellomere 6.6– 7.2X longer than wide, 1.2X widest transverse diameter of eye, second flagellomere 0.6–0.7X length of first.

Occipital carina present on ventral 0.6–0.7 of head. Mesosoma: Anterior margin of pronotum broadly truncate, laterally rounded and slightly upcurved. Lateral groove of pronotum well-developed, sculptured, extending over dorsal 0.7, rarely complete to posterior margin. Pronotum completely glabrous, impunctate. Mesoscutum shiny, very sparsely punctate on anterior 0.3. Epicnemial carina parallels anterior margin of mesopleuron. Mesopleuron usually moderately but weakly punctate. Metapleuron evenly setose. Propodeum with at least posterior vestige of pleural carina present; impunctate medially, moderately punctate laterally. Tarsal claws with stout setae basally. Fore wing stigma roughly 4.0X longer than wide; Rs+2r arising from basal 0.3–0.4 of stigma; marginal cell about 3.1–3.2X longer than wide; 2rs-m 1.8–2.8X longer than abscissa of M between 2rs-m and 2m-cu; Cu1a about 0.5X length of 2cu-a; cu-a interstitital to more rarely weakly antefurcal relative to Rs&M. Hind wing M+Cu moderately, not strongly bowed; basal abscissa of Rs 0.9– 1.2X length of rs-m; 1st abscissa of Cu1 1.0–1.5X longer than cu-a. Metasoma: T1 about 2.0X as long as broad; with shallow median groove basally fading to flat surface at level of spiracle, moderately convex posteriorly, dorsal tendon anchored within shallow depression; spiracles not strongly protruding; dorsolateral carina extending 0.4–0.5X distance to spiracle. Cerci not readily visible.

Male: First flagellomere 7.2–7.8X longer than wide; fore wing with 2rs-m 2.4–3.8X longer than abscissa of M between 2rs-m and 2m-cu; hind wing with 1st abscissa of Cu1 1.6–1.9X longer than cu-a. Otherwise identical in structure and color to female except subgenital plate with wide deep truncate median incision, its margin even. Aedeagal margin not toothed ( Fig. 31 ).

Color. Head yellow with black median stripe on frons and vertex, extending as narrow line to median tubercle on face in only one specimen; occiput black. Antenna dark brown to black dorsally, scape, pedicel and first flagellomere yellow ventrally with remaining flagellomeres gradually darkening to brown distally, often with faint subapical band of 1–3 flagellomeres. Pronotum, except for ventrolateral corner, mesoscutum except for pair of median and anterolateral marks, mesopleuron dorsally, and usually most of metapleuron black; dorsoposterior corner of mesopleuron nearly always black; mesopleuron ventrally black in about half of material examined; mesoscutellum yellow; propodeum mostly yellow with black horseshoe-shaped marking. T1 yellow basally with two black bands extending from spiracle to or nearly to apex, bands sometimes partially coalescing basomedially; T2 and often T3 with yellow triangular patch medially, otherwise dark brown to black, remaining tergites largely dark laterally, with varying amounts of yellow to orange medially. Hind coxa yellow with broad black band laterally, trochanter largely black, trochantellus mostly yellow, femur and tibia orange, usually with black markings at base of femur, tarsomeres dark orange to brown, usually darker dorsally. Fore wing entirely hyaline.

Material Examined. Holotype ɗ ( AEIC, Type No. 3851): [ USA, Arizona] first line of data label: “Portal, Ariz.” second line: “VIII.31.1974” third line: “H. & M. Townes”. Paratypes: 1 ɗ 4 Ψ, same data as holotype except dates ranging 14.viii–3.ix.1974 ( AEIC).

Remarks. The species name is from Latin, referring to the rounded excavation in the male subgenital plate. This species is known only from southeastern Arizona.

Figures

FIGURES 29 – 32. Habitus, face, and male genitalia. 29 – 31, Physotarsus emarginatus n. sp.; 29, habitus; 30, face; 31, male genitalia, ventral view. 32, P. flaivpennis n. sp., habitus.