Phradis nanacamilpus 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 : 66-67

Phradis nanacamilpus Khalaim & Ruiz-Cancino sp. n.

Figs 14-21

Comparison.

In the key to the Nearctic species of Phradis ( Horstmann 2013b), P. nanacamilpus runs to couplet 10 but does not correspond with either side of the couplet as it has the mesopleuron very finely and sparsely punctate on a smooth background centrally, shallowly granulate peripherally (Fig. 19 ), dorsolateral area of propodeum without irregular wrinkles (Figs 18 , 20 ), and ovipositor sheath 1.4 times as long as first tergite.

Description.

Female. Body length 3.8 mm. Fore wing length almost 2.5 mm.

Head, in dorsal view, almost 1.7 times as broad as long, weakly constricted and weakly rounded posterior to eyes (Fig. 17 ); temple 0.7 times as long as eye width (Fig. 17 ). Eyes with short and rather dense setae. Clypeus (Fig. 16 ) lenticular in anterior view, 3.5 times as broad as long, almost flat in lateral view, smooth, separated from face by sharp furrow, with a few fine punctures next to upper and lower margins. Mandible weakly tapered at base, with upper and lower margins subparallel in apical 0.8; upper tooth distinctly longer than the lower. Malar space slightly shorter than basal mandibular width. Antennal flagellum (Fig. 15 ) with 14 flagellomeres, basally very slender; second and third flagellomere 3.0-3.5 times and subapical flagellomeres 1.4-1.6 times as long as broad. Face with weak median prominence in upper part. Face with very fine inconspicuous punctures (medial prominence impunctate), smooth between punctures and shining centrally, and very finely granulate and weakly shining laterally. Frons smooth and very fine punctate, laterally (next to eye orbits) very finely granulate and dull. Vertex and temple with very fine punctures on smooth and shining background. Occipital carina complete, flattened mediodorsally.

Mesosoma predominantly finely granulate, impunctate, dull; mesoscutum evenly finely punctate smooth and shining background; mesopleuron centrally more or less smooth and shining, with fine and sparse punctures, peripherally shallowly granulate and weakly shining to dull. Notaulus as a rather strong wrinkle on anterolateral side of mesoscutum. Scutellum with lateral longitudinal carinae at extreme base. Foveate groove weak and narrow, situated in centre of mesopleuron, slightly oblique, with fine and short transverse wrinkles (Fig. 19 ). Propodeal spiracle small, separated from pleural carina by about 4.0 times diameter of spiracle. Propodeum with basal area weakly widened anteriorly, twice broader anteriorly than posteriorly and almost 0.4 times as long as apical area (Fig. 20 ); basal longitudinal carinae weak but distinct. Apical area impressed along midline, rounded anteriorly (Fig. 20 ); apical longitudinal carinae distinct, reaching transverse carina anteriorly.

Fore and hind wing venation very similar to that in P. bufalosus . 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. Second abscissa of postnervulus incomplete, partly enclosing brachial cell posteriorly. Hind wing with nervellus (cu1&cu-a) weakly reclivous.

Legs slender. Hind femur 4.8 times as long as broad and 0.85 times as long as tibia. Tarsal claws not pectinate.

First tergite slender, almost 5.0 times as long as posteriorly broad, smooth, with very weak striae ventrolaterally; tergite round in cross-section centrally, with lateral sides subparallel and petiole not separated from postpetiole in dorsal view. Glymma absent. Second tergite 3.6 times as long as anteriorly broad. Thyridial depression very long and narrow, pointed posteriorly, extending in basal 0.4 of tergite. Ovipositor slender, weakly and nearly evenly bent upwards over its total length, evenly tapered apically, with weak but distinct dorsal subapical notch (Fig. 21 ); sheath 1.4 times as long as first tergite.

Head, mesosoma and first metasomal segment black. Palpi, mandible (teeth dark reddish brown) and tegula brownish yellow. Lower 0.7 of clypeus yellow-brown. Antenna brownish yellow basally to brownish black apically (Fig. 15 ). Pterostigma brown. Leg brownish yellow; mid and hind coxae darkened with brown; hind femur brown except base and apex. Metasoma posterior to first tergite dark brown.

Male. Unknown.

Etymology.

The species is named after the type locality, Nanacamilpa.

Material examined.

Holotype female (UNAM), Mexico, Tlaxcala, Nanacamilpa, Ejido Los Búfalos, N19°28', W98°35', bosque Pino-Encino , 2830-2900 m, Malaise trap, 3-30 June 2016, coll. Y. Marquez & A. Contreras.

Distribution.

Central Mexico (Tlaxcala).

Figures

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.