258 Mr. Cameron on 



except the apical half of the posterior femora and tibiae. 

 The scape is yellow ; the flagellum fulvous beneath ; the 

 third and fourth joints are sub-equal. 



The $ is similarly coloured, except that the mesopleurse 

 want the yellow mark and the scutellum is entirely yellow. 

 Length 7 — 10 mm. 



Cerceris Wroughtoni, sp. nov. (PL X. f. 9, a, b). 



Black, shining, thorax, and head punctured, the abdomen 

 impunctate, smooth ; the clypeus, the cheeks to above the 

 base of the antennae, the antennal ridge, the scape beneath, 

 a large broad line behind the eyes, a line on the pronotum, 

 scutellum, metanotum, two small marks on the middle of 

 the median segment, the petiole, except a broad stripe down 

 the centre, the base of the second and third segments all 

 round, the edge of the fourth, and a large mark in its centre, 

 a similar mark on the fifth ; and the basal three ventral 

 segments, for the greater part, clear yellow ; the flagellum 

 beneath and a large mark on either side of the median 

 segment rufo-fulvous ; legs fulvous, the anterior four in front 

 and the hinder femora in part, pale yellow. Wings fuscous, 

 the apex much darker, the stigma fulvous. Antennae 

 with the third joint about one quarter longer than the 

 fourth. Clypeus flat, the apex black, roundly and broadly 

 incised ; its sides and the cheeks bearing a silvery pube- 

 scence. Ocelli forming almost a triangle, the posterior 

 separated from the eyes by more than the length of the 

 third antennal joint ; and by about its length from each 

 other. The pubescence on the head is longish and pale ; 

 the punctuation moderately strong, and all the punctures 

 deeply separated. Thorax moderately strongly punctured, 

 covered with a pale pubescence ; the pronotum above saddle- 

 shaped ; the transverse furrow in the mesopleura wide, 

 deep and complete ; scutellum sparsely punctured ; trigonal 

 area smooth, impunctate, furrowed down the middle ; meta- 



