Troticus giganteus, van Achterberg, Cornelis & Long, Khuat Dang, 2010

van Achterberg, Cornelis & Long, Khuat Dang, 2010, Revision of the Agathidinae (Hymenoptera, Braconidae) of Vietnam, with the description of forty-two new species and three new genera, ZooKeys 54, pp. 1-184 : 114-116

Troticus giganteus sp. n. Figs 398-405

Type material.

Holotype, ♀ (RMNH), Aga. 296, "Central North Vietnam: Nghe An, Pu Mat N.P., 17.iv.2006, P.Th. Nhi".

Diagnosis.

Similar to Troticus latiabdominalis (Bhat, 1978) comb. n. from India. The latter has a short ramellus at the second submarginal cell of the fore wing, the vertex and the occiput brownish, the scutellar sulcus with 5 carinae, temple, face laterally and malar space yellowish-brown and the first metasomal tergite about as long as its apical width. Also rather similar to Euagathis gracilitarsis van Achterberg & Chen, 2002, from China, but differs by having the first tergite wider (its length 0.8 times its apical width; Euagathis gracilitarsis : 1.7 times its apical width), the second submarginal cell of the fore wing distinctly narrowed anteriorly ( Euagathis gracilitarsis : slightly narrowed anteriorly), the temple largely black ( Euagathis gracilitarsis : yellowish-brown), the metasoma yellowish-brown ( Euagathis gracilitarsis : largely blackish) and the the pale patch below pterostigma large ( Euagathis gracilitarsis : small).

Description.

Holotype, ♀, length of body 14.6 mm, of fore wing 13.5 mm.

Head.

Antennal segments 62, length of third segment 1.2 times fourth segment, length of third, fourth and penultimate segments 2.1, 2.0 and 1.3 times their width, respectively; apical antennal segment obtuse; scapus slender; length of maxillary palp 0.7 times height of head; in dorsal view length of eye 1.3 times temple; temple straight laterally and weakly narrowed (Fig. 399); ocelli small, POL:OD:OOL = 10:6:22; face finely punctate; lateral carina of frons almost connected to rim of antennal sockets (Fig. 399); frons, vertex and temple smooth, sparsely setose; pair of crests between antennal sockets slightly convergent.

Mesosoma.

Length of mesosoma 1.5 times its height; subpronope very deep and large; pronotum smooth laterally, crenulate anteriorly; area near lateral carina of mes oscutum smooth; side of mesoscutum shiny and smooth, medio-posteriorly slightly depressed, middle lobe convex; notauli wide, deep and coarsely crenulate; scutellum slightly narrowed posteriorly, rugose-punctate, subposterior crest strong and curved; scutellar sulcus with 3 carinae and 0.6 times as long as dorsal part of scutellum (Fig. 401); mesopleuron below precoxal sulcus finely punctate and above sulcus shiny, almost smooth; precoxal sulcus deep, extending two thirds of mesopleuron and strongly crenulate, with 6 carinae; metapleuron finely punctate; propodeum coarsely areolate with pentagonal areola and medial carina basally (Fig. 401); spiracle large, elliptical, 2.5 times as long as wide, distance between spiracle and lateral carina as long as width of spiracle.

Wings.

Fore wing: second submarginal cell large, pentagonal, narrow anteriorly, without ramellus (Fig. 404); r:3-SR:SR1= 3:7:61; 2-SR:3-SR:r-m = 10:7:11. Hind wing: M+CU rather long, 0.8 times as long as 1-M (32:40) (Fig. 405); surroundings of cu-a densely setose.

Legs.

Hind coxa rather long, hind femur robust, length of hind femur, tibia and basitarsus 2.8, 5.6 and 6.2 times their width, respectively; hind femur (as remainder of legs) with long and dense setosity; outer side of apex of hind tibia with two distal each other pegs; length of outer and inner spurs of middle tibia 0.5 and 0.6 times middle basitarsus, respectively; length of outer and inner spurs of hind tibia 0.3 and 0.6 times hind basitarsus; fore and middle tarsi robust (Fig. 398).

Metasoma.

First tergite short, smooth, slightly widened apically (Fig. 403); length of first tergite 0.8 times its apical width, slightly depressed laterally; second metasomal suture finely impressed (Fig. 403), ovipositor sheath short, truncate apically, with long setae, 0.3 times as long as inner hind tibial spur; visible part of ovipositor 0.8 times as long as inner hind tibial spur.

Colour.

Yellowish-brown; antennae, malar space and temple largely black; basal half of wings and pterostigma yellow (Figs 398, 404, 405); large stigmal spot being part of large dark brown band below parastigma; apical third of wings and hind tarsus (except basitarsus) dark brown.

Distribution.

Central North Vietnam: Nghe An.

Biology.

Unknown.

Etymology.

From “gigantos” (Greek for “giant”), because is one of the largest known species of the genus.