Phradis bufalosus Khalaim & Ruiz-Cancino, 2018

Khalaim, Andrey I. & Ruiz-Cancino, Enrique, 2018, First record of the genera Diaparsis Foerster and Phradis Foerster (Hymenoptera, Ichneumonidae, Tersilochinae) from Mexico, Journal of Hymenoptera Research 63, pp. 61-72 : 62-66

Phradis bufalosus Khalaim & Ruiz-Cancino sp. n.

Figs 7-13

Comparison.

In the key to the Nearctic species of Phradis ( Horstmann 2013b), P. bufalosus runs to P. flavicoxa Horstmann in couplet 9 but may be distinguished from this species by the head being weakly constricted behind the eyes (Fig. 9 ), dark legs (Fig. 10 ), smooth first metasomal tergite, long second tergite (Fig. 12 ) and a needle-shaped ovipositor apex (Fig. 13 ).

Morphologically and in colouration, P. bufalosus is very similar to P. coriaceus Horstmann, from which it differs by the temple being finely punctate on a smooth background (granulate, impunctate and dull in P. coriaceus ) and longer second metasomal tergite (2.8 times as long as anteriorly broad in P. bufalosus and 1.8 times in P. coriaceus [measured from Fig. 21 in Horstmann 2013b: 73]).

Description.

Female. Body length 2.5 mm. Fore wing length 1.85 mm.

Head, in dorsal view, 1.65 times as broad as long, weakly constricted and rounded posterior to eyes (Fig. 9 ); temple 0.8 times as long as eye width (Fig. 9 ). Eyes with short and rather dense setae. Clypeus lenticular in anterior view, 3.4 times as broad as long, weakly convex in lateral view, smooth, separated from face by sharp furrow, with fine scattered punctures in upper 0.3. Mandible weakly tapered at base, with upper and lower margins subparallel in apical 0.8; upper tooth distinctly longer than the lower. Malar space almost as long as basal mandibular width. Antennal flagellum (Fig. 8 ) with 14 flagellomeres, basally slender; second and third flagellomere 2.3-2.5 times and subapical flagellomeres 1.2-1.3 times as long as broad. Face with elongate median prominence in upper part. Face very finely punctate (punctures vanishing on medial prominence and laterally next to eyes and malar spaces), smooth between punctures and shining centrally, and very finely granulate and dull laterally. Frons very finely punctate on very finely granulate background (punctures partly hardly discernible because of granulation), weakly shining to dull. Vertex and temple with very fine but distinct punctures on smooth and shining background. Occipital carina complete, somewhat dipped mediodorsally.

Mesosoma predominantly finely granulate, impunctate, weakly shining to dull, except for mesoscutum which is very finely punctate on more or less smooth and shining background. Notaulus discernible as weak and short wrinkle on anterolateral side of mesoscutum. Scutellum with lateral longitudinal carinae at basal 0.2. Foveate groove absent, mesopleuron centrally almost smooth. Propodeal spiracle very small, separated from pleural carina by about 3.0 times diameter of spiracle. Propodeum with basal area strongly widened anteriorly, about 3.0 times broader anteriorly than posteriorly and almost half as long as apical area (Fig. 11 ); basal longitudinal carinae weak but distinct. Apical area flat, rounded anteriorly (Fig. 11 ); apical longitudinal carinae distinct posteriorly and weak anteriorly, not reaching transverse carina anteriorly.

Fore wing with second recurrent vein (2m-cu) interstitial. Intercubitus (2rs-m) long. First abscissa of radius (Rs+2r) slightly arcuate, longer than width of pterostigma. First and second abscissae of radius (Rs+2r and Rs) meeting at slightly acute angle (less than 90°). Metacarpus (R1) short, not reaching apex of fore wing (Fig. 7 ). Second abscissa of postnervulus represented by a short protrusion, thus brachial cell is widely open posteriorly. Hind wing with nervellus (cu1&cu-a) slightly reclivous.

Legs slender. Hind femur 4.3 times as long as broad and 0.9 times as long as tibia (Fig. 10 ). Tarsal claws not pectinate.

First tergite slender, 4.2 times as long as posteriorly broad (Fig. 8 ), smooth, with shallow striae laterally; tergite round in cross-section centrally, with lateral sides subparallel and petiole not separated from postpetiole in dorsal view (Fig. 12 ). Glymma absent. Second tergite about 2.8 times as long as anteriorly broad (Fig. 8 ). Thyridial depression almost 3.0 times as long as broad, with narrow groove extending from posterior end of thyridial depression along lateral margin of second tergite and reaching nearly its midlength. Ovipositor slender, weakly and nearly evenly bent upwards over its total length, with abruptly narrowed needle-shaped apex (Fig. 13 ); sheath 1.1 times as long as first tergite.

Head, mesosoma and first metasomal segment black. Palpi, mandible (teeth dark reddish brown), lower 0.7 of clypeus and tegula yellow to yellow-brown. Scape of antenna dark brown with narrow yellowish ring on distal end; pedicel yellow-brown; flagellum gradually darkening from brownish basally to black apically. Pterostigma brown. Fore leg brownish yellow with fore coxa dark brown and femur basally on dorsal side darkened with brown. Mid and hind legs with coxae brownish black, first and second trochanters brownish yellow (first trochanter darkened with brown), femora dark brown with extreme apex brownish yellow (Fig. 10 ), and tarsi brownish yellow. Metasoma posterior to first tergite and ovipositor sheath brownish black.

Male. Unknown.

Etymology.

The species is named after the type locality, [Los] Búfalos.

Material examined.

Holotype female (UNAM), Mexico, Tlaxcala, Nanacamilpa, Ejido Los Búfalos, N19°28', W98°35', bosque Pino-Encino , 2830-2900 m, Malaise trap, 4 April-3 May 2016, coll. Y. Marquez & A. Contreras.

Distribution.

Central Mexico (Tlaxcala).

Figures

Figures 7 - 13. Phradis bufalosus sp. n., holotype female. 7 habitus, lateral view 8 head with antenna, lateral view 9 head and mesoscutum, lateral view 10 hind legs, lateral view 11 propodeum, dorsal view 12 base of metasoma, dorsal view 13 apex of metasoma with ovipositor, lateral view.

Figures 14 - 21. Phradis nanacamilpus sp. n., holotype female. 14 habitus (without wings), lateral view 15 antenna, lateral view 16 head, front view 17 head, dorsal view 18 head, mesosoma and base of metasoma, lateral view 19 mesopleuron, postero-lateral view 20 propodeum, dorsal view 21 apex of metasoma with ovipositor, lateral view.