Hymenoptera Orientalis. 255 



before the middle. The antennae have the flagellum pale 

 fulvous beneath ; the eyes are parallel. 



The $ has the clypeus broadly truncate at the apex in 

 the middle, and with the lateral laminae pale ; the clypeus 

 wants the yellow mark ; the petiole is black ; otherwise as 

 in $ except that it is the 6th abdominal segment which is 

 marked with yellow. Length $ nearly 9 mm ; <£ 7 mm. 



A distinct species. 



What appears to be this species has a small yellow mark 

 at the base of the abdomen, the petiole beneath and later- 

 ally and the base of the second segment are rufous and there 

 is a small white mark on the base of the latter. 



Cerceris tristis, sp. nov. (PL X. f. 7, «, b). 



Eyes parallel. Ocelli not forming a triangle ; the posterior 

 separated from the eyes by nearly the length of the second and 

 third joints united and from each other by less than the length 

 of the third. Middle lobe of the clypeus convex, gaping at the 

 apex, which is broadly and narrowly incised. Punctuation 

 of head close and rather strong ; the face densely covered 

 with silvery hair. Head below the antennae and the orbits 

 for the length of the scape above the base of the antennae, and 

 the mandibles, except at the apex, yellow. Extreme apex 

 of clypeus black. Thorax strongly punctured, more coarsely 

 on the pleurae ; thetegulae, a lineon either sideof thepronotum, 

 and metanotum, yellow. Trigonal area obscurely aciculated, 

 the sides punctured irregularly ; the central furrow crenu- 

 lated. Petiole longer than broad, distinctly bulging out at 

 the sides ; the segments with a moderately strong punctua- 

 tion ; a mark broader than long on the base of the second 

 segment ; the apex of the third segment (narrowed in the 

 centre) and a narrower belt on the fifth, also narrowed in the 

 centre, yellow. Pygidial area elongated, narrower at base 

 than at apex, the latter bluntly rounded ; the surface irregu- 

 larly rugose. Incision in hypopygium broad, a little longer 

 Q 



