178 POMPILID^. 



Key to the Species. 



A. Abdomen black. 



a. Fore wiiif? hyaline, apex fuscescent A. bengalensis,-^. 178. 



b. Fore wiug fuscous, the basal, 1st cubital, Ist 



and base of 2nd discoidal cells with a narrow 



subapical band hyaline A. orientalis, p. 178. 



B. Abdomen pale red, the apical segment fuscous. A. cotesi, p. 178. 



352. Aporus bengalensis, Cam. Mem. Manch. L. Ph. Soc (4) iv, 



1891, p. 478. 



5 . Head, thorax, and abdomen pruinose ; the head convex in 

 front, remarkably concave behind ; pronotum long, its posterior 

 margin transverse ; median segment long with a rounded gradual 

 slope, the apex obscurely longitudinally striated ; legs with the 

 tibiae and tarsi very sparsely spinose ; abdomen pseudosessile. 

 Black, with obscure silvery pile, most dense on the clypeus and 

 front and forming apical bands on the 1st and 2nd segments of 

 the abdomen ; wings hyaline, the fore wing lightly fuscous beyond 

 the 2ud cubital cell, this latter is narrowed at the top and receives 

 below both recurrent ner\ures. 



Hah. Barrackpore, Bengal. $ . Length 6 ; exp. 10 mm. 



353. Aporus orientalis. 



Planiceps orientalis. Cam. Mem. Manch. L. Ph. Soc. (4) iv, 1891, 

 p. 477, pi. iii, tig. 1. 



5 . Head, thorax, and abdomen smooth and shining ; the 

 clypeus slightly convex, its anterior margin oblique at the sides, 

 transverse in the middle ; front flat, the ocelli widelv separated, a 

 short longitudinal notch behind the two posterior ocelli ; pronotum 

 rounded, two obscure tubercles in the middle anteriorly, the 

 posterior margin regularly but very slightly arched ; the scutellura 

 very prominent ; the median segment short, somewhat flat, the 

 sides vertical, the apex steeply sloped ; legs stout, the tibiao and 

 tarsi with thick short spines ; abdomen pseudosessile, sharply 

 acuminate at apex. Black ; wings fuscous, in the fore wing the 

 basal, the 1st cubital, 1st discoidal, base of 2nd discoidal, and 

 a narrow band beyond the 3rd cubital and 2nd discoidal cells 

 hyaline ; in the hind wing the basal two-thirds are hyaline. 



Hah. Barrackpore, Bengal. $ . Length 15 ; exp. 27 mm. 



354. Aporus cotesi, Cam. Mem. Manch. L. Fh. Soc. (4) iv, 1891, 



p. 478, pi. iii, fig. 2. 



2 . Head, thorax, and legs densely pruinose, abdomen smooth ; 

 clypeus narrow, transverse, slightly convex, its anterior margin 

 arched, front broad, with an abbreviated vertically impressed line 

 above the base of the antennae ; pronotum rounded in front, 

 narrowed towards the head, widely arched posteriorly ; median 

 segment long, smooth, rounded above, with a medial longitudinal 

 shallow furrow ; legs slender, the tarsi spinose, the tibia) with 

 very minute spines ; abdomen long, as long as the head and 



