Casinaria artivultis Han, van Achterberg & Chen, 2021

Han, Yuan-Yuan, Achterberg, Kees Van & Chen, Xue-Xin, 2021, The genus Casinaria Holmgren, 1859 (Hymenoptera: Ichneumonidae, Campopleginae) from China, Zootaxa 4974 (3), pp. 504-536 : 510-512

Casinaria artivultis Han, van Achterberg & Chen , sp. nov.

Figs. 3–4

Material examined. Holotype: female, Guangxi, Damingshui Linfeng , 9.VIII.2011, Liu Zhen, No201100127 . Paratypes: 2 females, Fujiang, Jiangle Longqishan , 8.VII.1991, Liu Changming, No 969688, 969627 ; 1 female, Zhejiang, Hangzhou , 9. VI.1995, He Junhua, No 850520 ; 1 female, Zhejiang, Songyang , 29. VI.1993, Chen Hanlin, No 954853 ; 2 females, Zhejiang, Tianmushan Xianrending , 30.VII.2003, Shi Min, No 20058145, 20058171 .

Description. Female holotype. Body length 8.8 mm, fore wing length 5.5 mm.

Head. Antenna with 36 flagellomeres; basal flagellomeres relatively slender, first flagellomere about 3.0× as long as wide apically. Head transverse, width 2.3× its length in dorsal view. Temple narrow behind eye, in dorsal view about 0.4× as long as eye width. Interocellar distance about 2.2× ocello-ocular distance, 1.6× between median and lateral ocelli and 1.2× diameter of ocelli. Inner eye orbits indented and weakly convergent ventrally. Genal carina slightly bent outwards ventrally, reaching hypostomal carina at mandibular base. Malar space 0.3× as long as basal width of mandible. Face granulate-rugulose, flat in profile, narrowed ventrally, minimal width of face 0.5× as long as eye length and 0.9× as long as width of frons. Clypeus granulate-rugulose, weakly convex in profile, apical margin convex.

Mesosoma. Pronotum rugulose above, trans-striate below. Mesoscutum granulate-punctate, rugulose in notaulic area. Scutellum and metascutellum rugose-punctate. Mesopleuron rugose-punctate, weakly trans-striate below subtegular ridge; speculum mat with very fine striate. Metapleuron rugulose, with lower portion rugose, juxtacoxal carina indistinct. Propodeum rugulose on sides, strongly rugose-reticulate dorsally, with median groove narrow and moderately deep, trans-striate; basal carina close to base; median longitudinal carina absent; lateral longitudinal carina absent; apical transverse carina distinct on sides and costulae absent; propodeal spiracle oval.

Wing. Fore wing areolet small with a long stalk emitting second recurrent vein from its apical part. Radial cell very short, distal part of surrounding vein about 1.8× longer than the proximal one. Nervulus distad of basal vein by 0.2 its length. External angles of discal cell acute (75°). Hind wing with nervellus reclivous, not intercepted.

Legs. Hind femur 4.3× as long as wide. Inner spur of hind tibia about 0.8× as long as first tarsomere of hind tarsus.

Metasoma. Apical tergites from the 3th tergite on slightly compressed. First tergite short, stout, widened apically, 3.4× as long as its apical width, about 1.3× as long as second tergite, and as long as hind femur. Second tergite 1.8× as long as its apical width; thyridium drop-shaped, its distance from basal margin of tergite about equal to its length; third tergite as long as its apical width; ovipositor sheath short, not extending behind metasomal apex.

Colour. Black. Mandible except teeth yellowish brown. Scape and pedicel brown. Tegulae yellow. Coxae reddish brown; all trochanters whitish yellow; all femora yellowish brown but apically whitish yellow; outer side of fore and mid tibiae whitish yellow and inner side yellowish brown; hind tibia basally and medially yellowish brown, subbasally and apically blackish, tarsomeres brown. First and second metasomal tergites black but apically reddish brown, remainder of metasoma yellowish brown.

Variation. Antenna with 34–36 flagellomeres, first flagellomere 3.0–3.2× longer than wide apically. Interocellar distance 2.0–2.2× ocello-ocular distance. Hind femur 3.8–4.3× longer than wide. First tergite 3.4–3.7× longer than its apical width. Scape and pedicel yellowish brown to brown.

Male. Unknown.

Distribution. China (Fujian, Guangxi, Zhejiang).

Comparison. This new species is similar to C. exilis sp. nov., but differs from the latter by having the face relatively narrow, genal carina slightly bent outwards ventrally, reaching hypostomal carina at mandibular base, speculum mat with very fine striate, medio-longitudinal carina of propodeum absent, hind wing with nervellus reclivous and all trochanters whitish yellow.

Etymology. Name derived from “artus” (Latin for “narrow”) and “vultus” (Latin for “face”) and refers to the comparatively narrow face.

Figures

FIGURE 3. Casinaria artivultis sp. nov., female, habitus.

FIGURE 4. Casinaria artivultis sp. nov., female. A, fore wing; B, mesopleuron; C, propodeum; D, head, anterior view; E, head, dorsal view; F, mesoscutum.