Bassus albozonatus, 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 : 19-21

Bassus albozonatus sp. n. Figs 26-35

Type material.

Holotype, ♂ (RMNH), Aga. 282, "NE Vietnam: Ninh Binh, Cuc Phuong N.P., MT, 20°23'N; 105°34'E, 5-10.v.2002, K.D. Long". Paratypes: 1 ♂ (IEBR), Aga. 283, same data as holotype; 1 ♂ (RMNH), Aga. 234, "S. Vietnam: Dac Lak, Cu N’Ga forest, 10.vi.2005. K.D. Long".

Diagnosis.

The new species is similar to Bassus albifasciatus (Watanabe, 1934), but differs by having the malar space twice (2.6-2.8 times in Bassus albifasciatus ) as long as basal width of mandible, the precoxal sulcus short and shallow (distinct and 0.8 times as long as mesopleuron), the propodeum with three complete apical carinae (evenly reticulate-rugose) and (except more or less posteriorly) brownish-yellow (brown to black), the notauli more widely crenulate (rather narrowly crenulate), the mesoscutum flattened medio-posteriorly (rather convex) and the hind tibial spurs pale yellowish and distinctly contrasting with the blackish hind basitarsus (brownish and less contrasting). Because of the colour of the head and of the first tergite the new species is similar to Bassus subrasa (Enderlein, 1920) comb. n. from Indonesia. However, the latter has the eye about 3 times as long as the temple (2.3 times in Bassus albozonatus ), the second tergite distinctly costate (only partly striate), the notauli smooth (finely crenulate) and vein cu-a of the fore wing distinctly postfurcal (interstitial).

Description.

Holotype, ♂, length of body 6.5 mm, of fore wing 6.0 mm.

Head.

Antennal segments 36, length of third segment 1.1 times fourth segment, length of third, fourth and penultimate segments 4.4, 4.0 and 2.3 times their width, respectively; length of apical antennal segment 1.6 times as long as penultimate segment; maxillary palp 0.7 times height of head; malar space twice as long as basal width of mandible; in dorsal view length of eye 2.3 times temple; ocelli in low triangle, POL:OD:OOL = 8:7:21 (Fig. 34); face shiny, with distinct punctures; frons with a medial ridge, smooth (Fig. 34); vertex and temple shiny, with sparse minute punctures.

Mesosoma.

Length of mesosoma 1.4 times its height; subpronope shallow; pronotum largely smooth with sparse fine punctures dorsally; area near lateral carina of mesoscutum sparsely crenulate; lateral lobes of mesoscutum shiny with fine punctures anteriorly, flat and smooth posteriorly; middle lobe of mesoscutum with sparse punctures and largely smooth posteriorly (Fig. 28); notauli complete and finely crenulate; scutellar sulcus 0.4 times as long as dorsal face of scutellum and with 3 carinae; scutellum convex, rather long and narrowed posteriorly, without subposterior crest (Fig. 28); precoxal sulcus short, shallow and rugose (Fig. 27); mesopleuron below precoxal sulcus with sparse distinct punctures; mesopleuron above precoxal sulcus largely smooth, but with sparse fine punctures posteriorly; metapleuron largely punctate anteriorly with irregular rugosity posteriorly; propodeum with three complete apical carinae and enclosing a large reticulate-rugose area (Fig. 28); propodeal spiracle rather small elliptical, 1.5 times as long as wide.

Wings.

Fore wing: second submarginal cell small trapezoid (Fig. 30); vein SR1 sinuate; r:3-SR+SR1 = 4:61. Hind wing: vein M+CU 0.7 times as long as vein 1-M (Fig. 30).

Legs.

Length of hind femur, tibia and basitarsus 3.9, 7.5 and 10.4 times their width, respectively; hind femur (as remainder of legs) with short setae; length of outer and inner spur of middle tibia 0.4 and 0.5 times middle basitarsus, respectively; outer apex of middle tibia with a cluster of 10 pegs; outer apex of hind tibia with a cluster of 12 pegs; length of outer and inner spur of hind tibia 0.4 and 0.5 times hind basitarsus, respectively; outer side of hind coxa with sparse punctures, of hind femur with distinct punctures; tarsal claws without lobe (Fig. 35).

Metasoma.

Length of first tergite 1.5 times its apical width, with dorsal and dorso-lateral carinae coarsely developed, dorsal carinae convergent, costate medially and pos teriorly nearly up to apex of tergite (Fig. 29); first tergite sparsely but coarsely striate; second tergite 1.4 times as long as third tergite, large basal area on two thirds of tergite partly smooth, rugose-punctate and remainder densely striate (Fig. 29); remainder of metasoma smooth.

Colour.

Brownish-yellow; antenna (but scapus yellow) brown; hind leg (but tibia with pale yellow basal ring) and metasoma dark brown or black (but basal area of second tergite ivory and first and second tergites white ventrally); pterostigma (except small pale brownish patch basally) and veins dark brown; wing membrane slightly infuscate or subhyaline, but apical 0.4 of fore wing rather infuscate.

Variation.

Length of body 6.5-7.0 mm, of fore wing 6.0-6.1 mm; penultimate antennal segment subequal to apical segment; vein M+CU of hind wing 0.7-0.8 times as long as 1-M; POL:OD:OOL = 8:6-7:21; outer apex of hind tibia with 9-12 pegs.

Distribution.

NE Vietnam: Ninh Binh and S Vietnam: Dak Lak.

Biology.

Unknown.

Etymology.

From “albus” (Latin for “white”) and “zona” (Latin for “girdle”), because of the white part of the second metasomal tergite.