Myiocephalus zwakhalsi van Achterberg,

Tan, Jiangli, Achterberg, Cornelis Van, Tian, Xiaoxia & Zhang, Ruonan, 2019, Revision of Myiocephalus Marshall (Hymenoptera: Braconidae: Euphorinae), with description of one new species, Zootaxa 4700 (1), pp. 117-131: 125-130

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Myiocephalus zwakhalsi van Achterberg

sp. n.

Myiocephalus zwakhalsi van Achterberg  , sp. n.

Figs 36–54View FIGURES 36–38View FIGURES 39–50View FIGURES 51–54

Type material. Holotype, ♀ ( RMNH), “ Austria: Tirol, Aschbach , 1400 m, 22.viii.1975, [Malaise trap], C.J. Zwakhals ”  . Paratypes: 1 ♀ + 2 ♂ ( RMNH), topotypic, and same date, but  1 ♂ with 16.viii.1975.

Short diagnosis. Length of malar space of ♀ 1.3–1.4 × basal width of mandible ( Fig. 48View FIGURES 39–50); width of face of ♀ equal to combined height of face and clypeus ( Fig. 46View FIGURES 39–50); occipital carina reaching dorsally near upper level of eye and sinuate laterally ( Fig. 48View FIGURES 39–50); area near occipital carina dark brown and occiput dorsally brown ( Fig. 47View FIGURES 39–50); basal half of first metasomal tergite with laterope visible in dorsal view ( Fig. 43View FIGURES 39–50); hypopygium of ♀ largely sclerotized, keeled ventrally, subtruncate or rounded posteriorly and with long setae ( Fig. 37View FIGURES 36–38); ovipositor (except basally) slender ( Figs 36, 38View FIGURES 36–38); mesopleuron of ♀ antero-dorsally largely rugulose and with some rugae medially ( Fig. 41View FIGURES 39–50); mesosoma  laterally and legs largely dark brown or brown ( Fig. 36View FIGURES 36–38).

Description. Holotype, ♀, length of fore wing 3.0 mm, and of body 4.1 mm.

Head. Antenna with 29 segments and 1.1 × as long as fore wing, third segment 1.2 × as long as fourth seg- ment, third, fourth and penultimate segments 4.0, 3.3 and 1.5 × as long as wide, respectively ( Figs 45, 50View FIGURES 39–50); length of maxillary palp 0.7 × height of head, segments slender ( Fig. 36View FIGURES 36–38); eye 2.8 × as long as temple in dorsal view; temples directly and linearly narrowed behind eyes ( Fig. 47View FIGURES 39–50); OOL:diameter of posterior ocellus:POL = 9:4:12; vertex and frons largely superficially coriaceous and shiny, but in front of ocelli mainly transversely rugulose; in front of anterior ocellus with small convexity ( Fig. 47View FIGURES 39–50); occipital carina complete (but reduced ventrally and remaining removed from hyaline hypostomal lamella) and dorsally remaining shortly below upper level of eyes ( Fig. 48View FIGURES 39–50); combined length of clypeus and face (measured from ventral rim of antennal socket to ventral border of clypeus) 1.1 × minimum width of face; face mainly very finely densely punctulate but latero-ventrally largely smooth, with whitish setae and satin sheen ( Fig. 46View FIGURES 39–50); clypeus convex medially and with slightly concave and thin ventral lamella ( Figs 46, 48View FIGURES 39–50), medially densely finely punctulate; anterior tentorial pits large ( Fig. 46View FIGURES 39–50); malar suture deep, narrow and straight; length of malar space 1.3 × basal width of mandible and malar space in anterior view straight ( Fig. 46View FIGURES 39–50); mandible slender, strongly twisted, outer side convex and with deep basal depression ( Fig. 48View FIGURES 39–50), its second tooth similar to first tooth and acute.

Mesosoma  . Length of mesosoma  1.3 × its height; side of pronotum mainly rugulose, dorsally largely punctulate ( Fig. 41View FIGURES 39–50); mesopleuron dorsally densely and finely rugulose ( Fig. 42View FIGURES 39–50), ventrally largely (including precoxal sulcus) rugose; prepectal carina absent medio-ventrally; episternal scrobe linear, long and posteriorly deep ( Fig. 41View FIGURES 39–50); mesosternum sparsely setose, convex and shiny; mesosternal suture shallow, narrow and smooth; notauli absent, mesoscutum very sparsely setose, flattened, moderately shiny and its posterior half with posteriorly converging aciculation ( Fig. 42View FIGURES 39–50); scutellar sulcus smooth and deep ( Fig. 42View FIGURES 39–50); scutellum anteriorly convex, smooth (except some rugulae antero-laterally) and shiny, medial part coriaceous, medio-posteriorly convex, smooth and no depression ( Fig. 42View FIGURES 39–50); metapleuron coriaceous-rugulose ( Fig. 41View FIGURES 39–50); propodeum slightly depressed medio-posteriorly between parallel carinae, anteriorly largely smooth and shiny, remainder densely finely rugose, and anterior face moderately differentiated from posterior face ( Fig. 43View FIGURES 39–50).

Wings. Fore wing: 2-M unsclerotized; 1-R1 1.2 × longer than pterostigma; marginal cell slender; r:3-SR+SR1:2- SR = 5:59:17; vein r issued  just behind middle of pterostigma; vein SR1 slightly curved basally ( Fig. 39View FIGURES 39–50); 1-CU1 slender and oblique; cu-a vertical; 1-CU1:2-CU1 = 3:13; basal and subbasal cells of fore wing similarly setose as other cells. Hind wing: M+CU:1-M:1r-m = 40:3:10; basal 0.7 of M+CU unsclerotized.

Legs. Middle and hind legs very slender (tibia and tarsus together about 2.5 × longer than femur, tibia approx. 4 × longer than coxa; Figs 36View FIGURES 36–38, 49View FIGURES 39–50); fore leg normal, tibia nearly 3 × as long as coxa; hind coxa finely aciculate dor- sally; length of femur, tibia and basitarsus of hind leg 7.0, 19.2 and 15.3 × as long as their maximum width; hind tibial spurs 0.2 × as long as basitarsus.

Metasoma. First tergite 3.8 × longer than its maximum width, basal half with distinctly concave sides and lat- erope partly visible, distinctly widened basally, flat (except minute depression near adductor) and smooth; posterior half convex, subparallel-sided ( Fig. 43View FIGURES 39–50); first tergite open ventrally and laterope very deep and large; following segments smooth, compressed and shiny, third–eighth tergites concave medio-apically ( Fig. 38View FIGURES 36–38); second metasomal suture distinct; sternites folded medially ( Fig. 37View FIGURES 36–38), fifth sternite finely and obliquely aciculate, medio-posteriorly with long bristly setae and strongly protruding ( Figs 37, 38View FIGURES 36–38) and hypopygium folded and sclerotized medially, protruding medio-posteriorly and with apical fringe of bristly setae ( Fig. 37View FIGURES 36–38); ovipositor sheath rather robust, parallel-sided and widened basally, setose part 0.11 × as long as fore wing (but dorso-basally glabrous); lower valve of ovipositor compressed, widened in lateral view and apex of upper valve narrow and remainder cylindrical ( Figs 36, 38View FIGURES 36–38).

Colour. Dark brown; palpi (but apical 3 maxillary segments infuscated), mandible, scapus, pedicellus ventrally, face, frons antero-laterally, temple ventrally and tegula (but humeral plate rather dark brown) fore legs (but tarsus largely, femur and trochantellus partly infuscate), pronotal side ventrally, propleuron, mesosternum anteriorly, middle leg (except dark brown trochantellus and base of femur), hind tibia and tarsus pale yellowish; remainder of legs infuscated brown ( Fig. 36View FIGURES 36–38); pterostigma and most veins of fore wing brown; wing membrane weakly infuscated.

Variation. Length of fore wing 3.0– 3.1 mm, and of body 4.1–4.4 mm; first tergite 3.8–4.2 × as long as its maxi- mum width; mesopleuron ventrally partly yellowish and less extensively rugose; ovipositor sheath moderately to hardly widened basally.

Male. Length of fore wing 2.9–3.0 mm, and of body 3.2–3.6 mm; antenna with 29(2) segments; length of malar space 1.6–1.7 × basal width of mandible; first tergite with some rugulae or aciculae medially; only sternites of basal half of metasoma folded medially and third–eighth tergites weakly concave posteriorly.

Biology. Unknown.

Distribution. Austria.

Etymology. Named after its collector, friend and specialist of Ichneumonidae, Kees Zwakhals (Arkel)  for his on-going efforts to collect interesting Braconidae  for more than 50 years.


National Museum of Natural History, Naturalis