216 bphegid.t:. 



moderately stout and long, slightly spiuose and shining ; abdomen 

 about the length of the thorax and head together. Head, thorax, 

 and base of the coxa3 of the legs black ; the apex of the coxse, the 

 trochanters, femora, tibiae, and tarsi, and the abdomen pale red ; the 

 mandibles, palpi, anterior margin of the clypeus, scape and basal joint 

 of the flagellum of the antennae reddish testaceous ; the whole insect 

 except on the legs co\ered with a glittering silvery pile, giving it 

 a curious frosted look ; wings hyaline, apex of the fore wing very 

 broadly dark fuscous and effulgent ; nervures and the tegulae pale 

 testaceous. 



Hob. Jeypore. $ . Length 8 ; exp. 15 mm. Type in coll. 

 Eothney. 



Genus GASTROSERICUS. 



Gastrosericiis, Spin. Ann. Soc. Ent. Fr. 1838, p. 480 ; Dahlb. Hym. 

 Eur. i, p. 467 (1845) ; S^nith, Cat. iv, p. 308 (1856) ; Kohl, Verh. 

 zool.-bot. Ges. Wien, 1884, p. 408. 



Type, G. ivaltlii. 



Range. Palaearctic and Oriental regions. 



Head a little wider than the thorax ; mandibles incised in the 

 middle of their outer margins ; eyes only slightly convergent 

 towards the vertex ; antennae in the male straight, not convolute ; 

 anterior ocellus normally formed, round, the posterior two ocelli 

 lengthened, flat, and placed on a convexity behind which the 

 vertex and front are punctured ; pronotum depressed below the 

 level of the mesonotum ; median segment formed as in the species 

 of Tachysphex, steeply sloped posteriorly with the sides perpen- 

 dicular, and nowhere is its area divided by impressed lines or folds. 

 Wings — fore w-ing with one radial and only two cubital cells ; 

 the radial cell broadly truncate at apex, the appendix slight ; 1st 

 cubital cell very long, receiving the 1st recurrent nervure towards 

 its apex, the 2nd trapeziform, nearly triangular, receiving the 

 2nd recurrent nervure about the middle. Legs with the tibiae and 

 tarsi spinose, anterior tarsi ciliated, the cilia moderately long, but 

 fine and soft ; intermediate tibiae with one apical spur ; the 

 posterior margin of the abdominal segments with transverse pilose 

 bands ; anal segment with the pygidial area well-developed in the 

 female, sub triangular and set with stiff hairs. 



Key to the Species. 



a. Abdomen wholly black G. rothneyi, p. 216. 



b. Abdomen, basal two segments red G. xoroughtoni, p. 217. 



407. Gastrosericus rothneyi, Cam. Mem. Manch. L. Ph. Soc. (4) ii, 

 1889, p. 147. 



$ . Vertex of the head and thorax very minutely and closely 

 punctured ; abdomen pruinose, the surface finely longitudinally 



