Hymenoptera Orientalis. 267 



Cerceris hilaris, Smith (PI. X., f. 17, a, b.) 

 The clypeus is longer than broad, and becomes gradually 

 broader towards the apex ; the five basal joints of the 

 flagellum of the antennae are rufous, and the remaining 

 joints are rufous beneath ; the third joint is slightly curved,, 

 and about one-third longer than the fourth ; the trigonal 

 area is coarsely longitudinally striolate ; the hypopygium is 

 transversely rugose, and narrowed gradually towards the 

 apex, and rounded there. Comes nearest to C. flavopicta, 

 but is larger, has the clypeus emarginate, the trigonal area 

 striolate, &c. 



PSENID^E. 



I. PSEN RUFIVENTRIS, Sp. 710V. 



Niger, mandibulis, pedibus abdomineque rufis ; alis dare 

 hyalinis, nervis nigris. ?. Long. 9 mm. 



Antennse closely covered with a pale microscopic pile ; 

 becoming gradually thickened towards the apex ; the scape 

 curved, bare ; as long as the third joint, which is about a 

 quarter longer than the fourth. Head shining, impunctate 

 above ; the front and clypeus closely and finely punctured. 

 Clypeus broadly convex, the apex depressed, gaping and 

 transverse in the middle. Ocelli in pits ; a short transverse 

 furrow behind them ; the hinder separated from the eyes by 

 about the length of the fourth antennal joint and by a 

 somewhat greater distance from each other. Eyes parallel, 

 coarsely facetted. Mandibles shining, somewhat punctured 

 at the base. The face, cheeks, base of front and of 

 clypeus densely covered with golden hair ; the outer 

 orbits of the eyes more sparsely with silvery. Thorax 

 opaque on the mesonotum, the rest shining, impunctate. 

 The apex of median segment irregularly reticulated, later- 

 ally striolated. Basal area of median segment semi-circular; 

 depressed at the apex, and bearing some stout keels and 

 with a straight, finely aciculated, shallow furrow in the 



