Aleiodes bistrigatus Roman, 1917

van Achterberg, Cornelis & Shaw, Mark R., 2016, Revision of the western Palaearctic species of Aleiodes Wesmael (Hymenoptera, Braconidae, Rogadinae). Part 1: Introduction, key to species groups, outlying distinctive species, and revisionary notes on some further species, ZooKeys 639, pp. 1-164 : 49-52

Aleiodes bistrigatus Roman, 1917 stat. rev. Figs 89-98

Aleiodes circumscriptus var. bistrigatus Roman, 1917: 9; Shenefelt 1975: 1171; Papp 1991: 109 (as synonym of Aleiodes borealis ) (examined).

Type material.

Lectotype here designated, ♀ (NRS), “Färöar [= Faroe Isl., Denmark], Klinck", “Triangisvaag”, "♀ Aleiodes circumscriptus var. bistrigatus Roman, C. van Achterberg, 1984. Lectotype", "178, 84", "Riksmuseum Stockholm", " NHRS-HEVA 000003802". Paralectotypes: 3 ♂ (NRS) with same locality labels as lectotype.

Additional material.

None.

Biology.

Unknown.

Diagnosis.

Apical half of hind femur (partly) dark brown, darker than hind trochanter and trochantellus; face with distinct rugae; antenna of female with 39 segments and third segment stout, 4 th– 7th segments moderately stout (but less than in Aleiodes diarsianae ; Fig. 164), of male with 38 segments; OOL 1.7 × diameter of posterior ocellus (Fig. 97); clypeus 0.4 × as wide as face (Fig. 95); mesopleuron black dorso-posteriorly (Fig. 90); malar space and inner orbita dark brown and temple near eye (= external orbita) reddish-brown; first tergite strongly widened apically; eye (of male) elongate in lateral view; middle third of hind femur yellowish brown or dark brown; vertex moderately setose, rather shiny and blackish posteriorly; mesosternum dark brown. Close to Aleiodes borealis (Thomson, 1892), but this species has less antennal segments (♀: 32-34 segments), palpi and legs more or less infuscate and the clypeus wider (about 0.5 × width of the face). The shape of the subbasal antennal segments is similar to that of series from Scandinavia mentioned under Aleiodes diarsianae , but this series has the temples directly narrowed behind the eyes and the males have 42-47 antennal segments and females 44-45. Similar to the Aleiodes pictus -aggregate (e.g. Aleiodes pictus ( Herrich-Schäffer, 1838) and Aleiodes nigriceps Wesmael, 1838), but these are usually smaller and less robust species, having the face without distinct rugae or only a few rugae dorsally, the mesosternum usually widely orange-brown (and the mesopleuron usually without rugae in Aleiodes nigriceps ), the malar space partly or completely yellowish brown, the first tergite less widened apically, the fore and hind tarsi comparatively slender, the eye normal in lateral view and the antenna less robust.

Description.

Lectotype, ♀, length of fore wing 4.0 mm, of body 5.5 mm.

Head. Antennal segments of ♀ 39, length of antenna 1.3 × fore wing, its subapical segments about 1.9 × as long as wide and third segment stout (Fig. 98); frons coriaceous and posteriorly rugulose, with satin sheen; OOL 1.7 × diameter of posterior ocellus and coriaceous; vertex rugulose-coriaceous, rather shiny; clypeus slightly convex, indistinctly sculptured; ventral margin of clypeus rounded and depressed (Fig. 95); width of hypoclypeal depression 0.38 × minimum width of face and face distinctly transversely rugose (Fig. 95); length of eye 1.6 × temple in dorsal view and temple gradually narrowed behind eye (Fig. 97); occiput behind stemmaticum coriaceous and with some rugulae, occipital carina interrupted dorsally; clypeus partly above lower level of eyes and 0.4 × as wide as face (Fig. 95); length of malar space 0.6 × length of eye in lateral view; eyes slightly protruding (Figs 95-97).

Mesosoma. Mesosoma 1.7 × as long as high; mesoscutal lobes coriaceous, matt, but medio-posteriorly longitudinally rugose; notauli complete and moderately wide, weakly crenulate and posteriorly widened and rugose; prepectal carina medium-sized and lamelliform, reaching anterior border; precoxal area of mesopleuron very coarsely rugose, connected to rugosity of dorso-anterior part of mesopleuron; speculum nearly smooth and shiny (Fig. 90); metapleuron granulate, matt and posteriorly rather tuberculate; mesosternal sulcus narrow and deep; mesosternum rounded posteriorly; scutellum elongate, slightly convex, coriaceous and laterally largely carinate; propodeum rather flat dorsally, laterally and apically rather rugose, anteriorly only weakly so, median carina complete, but posteriorly irregular.

Wings. Fore wing: r 0.3 × 3-SR (Fig. 89); 1-CU1 horizontal, 0.5 × as long as 2-CU1; r-m 0.65 × 2-SR, and 0.40 × 3-SR; second submarginal cell medium-sized (Fig. 89); cu-a vertical, not parallel with CU1b, straight; 1-M slightly curved posteriorly and not continuous with 1-SR. Hind wing: apical half of marginal cell parallel-sided or nearly so; 2-SC+R short and longitudinal; m-cu present; 1r-m distinctly oblique and 0.7 × 1-M.

Legs. Tarsal claws setose; hind coxa coriaceous but partly superficially rugulose, largely matt; hind trochantellus twice longer ventrally than wide; length of fore and hind femora 5.4 and 5.0 × their width, respectively (Figs 93-94); inner apex of hind tibia without comb; length of inner hind spur 0.35 × hind basitarsus.

Metasoma. First tergite 0.9 × as long as wide posteriorly and latero-posteriorly narrowly lamelliform, moderately convex and flattened posteriorly, dorsope comparatively wide (Fig. 91); first–third tergites densely and distinctly longitudinally rugose, robust (Fig. 91), with distinct median carina; medio-basal area of second tergite absent; second tergite 1.5 × as long as third tergite; second suture moderately impressed and crenulate; remainder of metasoma largely superficially coriaceous; fourth and apical fifth of third tergite without sharp lateral crease; ovipositor sheath (except dorsally) densely setose.

Colour. Black or brownish black; antenna yellowish brown, but scapus dorsally and apical seventh of antenna dark brown; palpi, temple near eyes, legs (except infuscate subapical part of hind femur), tegulae, longitudinal stripe on mesopleuron, mesoscutum posteriorly, metasoma baso-ventrally, first tergite medio-apically, middle of second tergite and third tergite medio-basally largely yellowish; veins and pterostigma (except yellowish basal third and centrally) dark brown; border between dark and pale part of pterostigma diffuse (Fig. 89); wing membrane subhyaline.

Variation. The male paralectotypes are very similar to the lectotype; one has a complete antenna with 38 segments and most of the hind femur darkened. One paralectotype has the hind coxa completely yellowish and the mesopleuron less coarsely rugose, but other paralectotypes have the mesopleuron coarsely sculptured and the hind coxa largely infuscate.

Note.

Possibly a Faroe Islands endemic.