T.VCHTSPHEX. 193 



Key to the Species. 



A. Head, thorax, and abdomen entirely black. 



a. Tarsi black T. benrjalensis, p. 193. 



b. Tarsi bright testaceous T, testaceijJes, p. 193. 



B. Head, thorax, and apical segments of abdo- 



men black, basal two or more segments 

 red. 



a. Pubescence on the head and face golden. T. anriceps, p. 194. 



b. Pubescence on the head and face silvery. 

 a' . Median segment punctm-ed. 



a^. A medial longitudinal furrow from 



base to apex of median segment . . T. argyreus, p. 194. 

 b"^. Median segment furrowed only at 



the apex \ . . . T. erythrog aster, p. 195 . 



V . Median segment transversely striate 



above, obliquely striate on the sides . T. rvfo-niger, p. 195. 



373. Tachysphex bengalensis, Cam. Mem. Manch. L. Ph. Soc. (4) ii 



1889, p. 144, 2 . ' 



2 . Head and thorax closely punctured, median segment above 

 somewhat coarsely reticulate, abdomen smooth, dull, and opaque ; 

 head with the front, clypeus, and cheeks densely pilose, a A- 

 shaped groove behind the ocelli, with a narrow impressed line or 

 furrow running from it to the anterior ocellus ; clypeus raised 

 in the middle, with the anterior margin narrowly transversely 

 depressed, smooth and shining ; median segment short, broad, 

 with a steep slope posteriorly, almost truncate, covered with a 

 thin soft pubescence ; abdomen with the posterior margins of the 

 1st to 5th segments with broad transverse bands of fine silky 

 pile ; pygidial area bare, shining, sparsely punctured. Black, the 

 pubescence white, the dense pile on the tront and cheeks, and the 

 transverse bands on the margins of the abdominal segments 

 silvery in certain lights ; wings hyaline, the apical margins 

 narrowly pubescent. 



Hob. Tirhoot, Bengal ; Tenasserira. $ . Length 8-10 ; exp. 15- 

 18 mm. 6 unknown. 



374. Tachysphex testaceipes, n. sp. 



c? . Head with the front, base of the clypeus, and the cheeks 

 densely pubescent ; clypeus lightly punctured anteriorly, the 

 margin slightly arched ; the vertex punctured, a deep A-shaped 

 furrow behind the pad of the ocelli ; thorax and median segment 

 with a thin soft short pubescence, the former closely punctured ; 

 the scutellum prominent aud shining ; median segment truncate 

 posteriorly, above and at apex coarsely reticulate, punctured on 

 the sides ; abdomen as long as the head and thorax united, 

 massive, the posterior margins of the 1st to 5th segments with 

 broad transverse bands of silky pile. Black, with a hoary 

 appearance from the thin, short, white pubescence on the thorax 

 VOL. I. o 



