Philositus parva, Han & Achterberg & Chen, 2022

Han, Yuan-Yuan, Achterberg, Kees Van & Chen, Xue-Xin, 2022, Four rare genera of the subfamily Campopleginae (Hymenoptera: Ichneumonidae) from China, with description of three new species, Zootaxa 5219 (3), pp. 247-264 : 260-263

Philositus parva sp. nov.

Figs. 9–10

Material examined. Holotype: female, Yunnan, Maguanxian Maanshan, 16.VII.2017, Malaise trap, No 202019708 ( ZJUH).

Description. Female ( Fig. 9 ) holotype. Body length 3.1 mm, fore wing length 2.6 mm.

Head. Antenna with at least 15 flagellomeres (apical part missing); first flagellomere ca. 3.2× longer than its wide. Face ( Fig. 10F ) granulose. Clypeus ( Fig. 10F ) granulose, apical margin of clypeus slightly arched. Malar space granulose, ca. 0.8× basal width of mandible. Upper tooth of mandible slightly longer than lower tooth, without lamella. Frons ( Fig. 10F ) granulose and without median carina. Vertex ( Fig. 10G ) granulose. Interocellar region ( Fig. 10G ) granulose. Interocellar distance 1.0× ocello-ocular distance and 1.7× distance between median and lateral ocelli; distance between lateral ocelli and eyes ca. 1.4 × longer than diameter of ocellus. Temple mat, ca. 0.6× as long as eyes in lateral view. Occipital carina evenly arched, reaching hypostomal carina at mandible base.

Mesosoma. Pronotum granulose laterally, transversely striate ventrally.Mesoscutum ( Fig. 10H ) granulose, notauli weakly present. scutellum and metanotum granulose with very small punctures. Mesopleuron ( Fig. 10B ) granulose, weakly transversely striate below tegula, speculum smooth and shiny. Metapleuron ( Fig. 10B ) granulose. Propodeum ( Fig. 10C ) with area basalis long trapezoid; area superomedia confluent with area petiolaris; area superomedia, area external and area dentipara granulose; area petiolaris granulose rugose; all carinae weakly developed.

Wing. Fore wing ( Fig. 10A ) areolet absent, portion of vein M between 2rs-m and 2m-cu ca. 0.5× as long as 2rsm. Marginal cell short, distal part of surrounding vein 3.0× longer than proximal one. Vein 1cu-a opposite of M& RS. External angles of second discal cell vertical. Hind wing with CU&cu-a vertical, not intercepted.

Legs. Hind femur ca. 5.0× longer than wide. First tarsal segment with ventral row of setae medially. Tarsal claws pectinate.

Metasoma. First metasomal segment ( Fig. 10I ) without glymma. First tergite 2.5× longer than width of postpetiole. Postpetiole granulose. Second tergite 0.6× as long as first tergite, 0.8× its apical width; thyridium circular, indistinct, away from base of second tergite by 0.5× its diameter. Third tergite 0.7× longer than its apical width. Sixth and seventh tergites without medial emargination. Ovipositor ( Fig. 10D ) straight, ca. 3.0× longer than apical depth of metasoma, with a subapical notch; ovipositor sheath slightly expanded apically.

Colour. Black. Mandible except teeth yellowish brown; palpi and tegula pale whitish; scape and pedicel yellowish brown; fore and mid legs yellowish brown except trochanters and trochantelli pale whitish; hind coxa blackish brown, trochanter and trochantellus whitish yellow, femur and tibia medially yellowish brown, tibia basally pale whitish, tibia subbasally and apically and tarsomere blackish brown; metasoma wholly black.

Comparison. This species differs distinctly from the only other known species of this genus P. enchophorus as shown in the key above.

Etymology. Name derived from “parvus” (Latin for “little”), because of its small body.

Figures

FIGURE 9. Philositus parva sp. nov., holotype, female, habitus.

FIGURE 10. Philositus parva sp. nov., holotype, female. A fore wing B mesosoma, lateral view C propodeum, dorsal view D ovipositor E hind first tarsi F head, anterior view G head, dorsal view G mesoscutum, dorsal view H first metasomal segment, lateral view.