Enicospilus alleni Shimizu, 2020

Shimizu, So, 2020, The Nepalese species of the genus Enicospilus Stephens, 1835 (Hymenoptera, Ichneumonidae, Ophioninae): a preliminary revision and identification key to species, Deutsche Entomologische Zeitschrift 67 (1), pp. 69-126 : 69

Enicospilus alleni Shimizu sp. nov. Fig. 3

Etymology.

The specific name is dedicated to the collector of the holotype, Mike Allen, who collected many specimens of Nepalese Hymenoptera that are now in NHMUK.

Material examined.

1♀: Nepal .

Type series: holotype ♀, Chautasa (6,000 ft), Nepal, 24.IX.1983, M.G. Allen leg. (NHMUK) (Fig. 3 ) .

Distribution.

Nepal.

Description.

Female (Holotype) (Fig. 3 ). Body length ca 29.5 mm.

Head with GOI = 2.9 (Fig. 3C ). Lower face 0.7 × as wide as high, very finely coriaceous with fine punctures and setae (Fig. 3B ). Clypeus 1.9 × as wide as high, shiny and very finely coriaceous with fine punctures and setae, almost flat in profile, and its lower margin acute (Fig. 3B, C ). Malar space 0.2 × as long as basal mandibular width (Fig. 3B, C ). Mandible weakly twisted by ca 25°, moderately long, evenly narrowed, its outer surface flat and smooth without a diagonal groove or a diagonal line of punctures (Fig. 3B, C ). Upper mandibular tooth 1.4 × as long as lower one (Fig. 3B ). Frons, vertex and gena moderately shiny with fine setae (Fig. 3B-D ). Posterior ocellus large and almost touching eye (Fig. 3B-D ). Ventral end of occipital carina joining oral carina. Left antenna complete with 64 flagellomeres, and right antenna apically incomplete with 53 flagellomeres; first flagellomere 1.7 × as long as second; 20th flagellomere 1.6 × as long as wide.

Mesosoma entirely very weakly shiny or not (Fig. 3E ). Pronotum entirely striate. Mesoscutum 1.5 × as long as its maximum width, very closely coriaceous with dense setae, very weakly shiny, evenly rounded in profile, and its anterior margin almost truncate in dorsal view and rounded in profile (Fig. 3E ). Notauli absent (Fig. 3E ). Scutellum moderately convex, very closely coriaceous with setae, with lateral longitudinal carinae reaching posterior end (Fig. 3E ). Epicnemium densely punctate with setae. Epicnemial carina weak, almost straight and inclined to anterior, its dorsal end not reaching anterior margin of mesopleuron (Fig. 3E ). Mesopleuron entirely closely longitudinally strigose (Fig. 3E ). Submetapleural carina very strongly broadened anteriorly and forming a lobe. Metapleuron densely punctate to reticulate with setae, moderately swollen (Fig. 3E ). Propodeum very strongly and abruptly declivous in profile; anterior transverse carina complete; pleural carina almost absent; anterior area longitudinally striate; spiracular area almost smooth with setae and strongly shiny; posterior area moderately subconcentrically strigose with a pair of strong posterior carinae laterally; propodeal spiracle elliptical, its outer margin not joining pleural carina by a ridge (Fig. 3E ).

Wings. Fore wing length ca 19.5 mm with AI = 1.0, CI = 0.4, DI = 0.3, ICI = 0.6, SDI = 1.6, SI = 0.1, SRI = 0.2; vein 1m-cu&M almost evenly curved; vein 2r&RS very slightly sinuous and RS evenly curved; fenestra and sclerites of discosubmarginal cell as in Figure 3F ; proximal sclerite triangular, confluent with distal sclerite, strongly pigmented; central sclerite entirely weakly sclerotised, very weakly pigmented partially, positioned in anterodistal part of fenestra; distal sclerite present proximally and absent distally; proximal corner of marginal cell uniformly setose; posterodistal corner of second discal cell ca 110°; posterodistal corner of subbasal cell ca 95°; vein 1cu-a antefurcal to M&RS by 0.3 × 1cu-a length (Fig. 3F ). Hind wing with NI = 2.8, RI = 2.2; vein RS straight; vein RA with 10 uniform hamuli.

Legs. Outer surface of fore tibia with scattered short spines. Hind leg with coxa in profile 1.8 × as long as deep; basitarsus 2.0 × as long as second tarsomere; fourth tarsomere 0.6 × as long as third tarsomere and 2.9 × as long as wide; tarsal claw simply pectinate.

Metasoma with DMI = 1.4, PI = 2.7, THI = 3.5; dorsal margin of tergite 1 slightly sinuous in profile; thyridium elliptical (Fig. 3A ).

Colour (Fig. 3 ). Entirely testaceous except for yellow eye orbit and vertex, apex of mandible black. Wings hyaline; fore wing sclerites and pterostigma testaceous; veins testaceous to brown.

Variation. Unknown, only known from the holotype.

Male. Unknown

Differential diagnosis.

The affinities of E. alleni sp. nov. are unclear, but it may be related to the E. flavicaput group. However, E. alleni sp. nov. is a very distinctive species, readily distinguished by many characters, such as the elongate lower face (Fig. 3B ), sculpture of the mesosoma (Fig. 3E ), shape of propodeum (Fig. 3E ), and two vestigial central sclerites of the fore wing fenestra (Fig. 3F ).

Figures

Figure 3. Enicospilus alleni Shimizu sp. nov., ♀, holotype. A. Habitus; B. Head, frontal view; C. Head, lateral view; D. Head, dorsal view; E. Mesosoma, lateral view; F. Central part of fore wing.