Gammabracon siamensis Quicke and Butcher, 2017

Quicke, Donald L. J., Hogan, James E., Bennett, Andrew M. R., Broad, Gavin R. & Butcher, Buntika A., 2017, Partial revision of the Indo-Australian braconine wasp genus Gammabracon Quicke (Hymenoptera: Braconidae) with descriptions of new species from Indonesia (Mollucas), Malaysia, Philippines and Thailand, Journal of Natural History 51 (21 - 22), pp. 1249-1294 : 1261-1263

Gammabracon siamensis Quicke and Butcher sp. nov.

( Figures 6 , 7 )

Material examined

HOLOTYPE: Female. THAILAND, Trang Province, Khao Chong, Forest Research Station , 7° 33 ʹ 2 ʺ N, 99° 47 ʹ 23 ʺ E, 75 m, August 2005, D. Lohman. ( QSBG).

Description

Female: Length of body 10 mm, of forewing 10 mm, of antenna 9.5 mm, of exserted part of ovipositor 15 mm.

Head. Antenna with 59 flagellomeres; terminal flagellomere acuminate; median flagellomeres 1.1; 1st flagellomere 1.4 × longer than 2nd and 3rd separately; width of head: width of face:height of eye = 1.8:1.0:1.0; intertentorial distance 1.37 × shortest distance between tentorial pit and eye; frons weakly and gradually impressed behind antennal sockets; shortest distance between posterior ocelli:transverse diameter of posterior ocellus:shortest distance between posterior ocellus and eye = 1.6:1.0:3.0; length of head behind eye 0.5 × length of eye in dorsal view.

Mesosoma. 1.9 × longer than high; scutellar sulcus with small medial notch; midposterior margin of propodeum gradually enlarged.

Wings. Forewing vein 3RSb 1.8 × longer than 3RSa and 6 × longer than rs-m; vein 1-M strongly expanding before junction with (Rs+M)a; anterior junction of vein 1cu-1 swollen; vein m-cu strongly thickened, weakly curved; base of hind wing with small glabrous area, not emarginate.

Legs. Foretibia with piceous long setae.

Metasoma. 1st tergite 1.3 × longer than apically wide with irregular longitudinal rugae between dorsal carinae, smooth lateral to dorsal carinae; 2nd tergite 1.3 × wider posteriorly than medially long, 1.15 × longer medially than tergite 3, with short midbasal triangular area, with posteriorly converging sublateral carinae that narrow and bifurcate posteriorly; 3rd tergite largely with strong longitudinal striation including pair of parallel medial carinae; 4th metasomal tergite with some longitudinal striae mediobasally forming a fan-like pattern and narrowly crenulate transverse median groove; ovipositor 1.5 × longer than body; ovipositor sheaths with dense, long setosity.

Colour. Head (including stemmaticum), scapus (except dark laterally) yellow; mesosoma, fore and mid legs orange; flagellum, hind legs and metasoma black; wing membrane yellow but apical part of forewing and apical and posterior part of hind wing infuscate.

Etymology

Based on the old name for Thailand.

Figures

Figure 6. Gammabracon siamensis sp. nov. HOLOTYPE female. (a) Habitus, dorsal view. (b) Face frontal view. (c) Head dorsal view. (d) Central part of forewing. (e) Base of hind wing.

Figure 7. Gammabracon siamensis sp. nov. holotype female. (a) Detail of scutellum and scutellar sulcus. (b) Forefemur and tibia. (c) 1st metasomal segment, lateral view. (d) Anterior metasomal tergites.