Bymenoptera Orientalis. 253 



Cerceris INSTABILIS, Smith, (PI. X. f. 4 — 4 a, b). 



A common and variable species, especially as regards 

 the amount of black on the thorax and abdomen. The $ 

 is C. velox, Smith. 



Cerceris pulchra. (PI. X. f. 5, a, b.) 



Black, the scape beneath, the cheeks, clypeus, mandibles 

 except at apex, two lines on the pronotum, tegulse, meta- 

 notum, a mark on the base of the second abdominal segment, 

 the third segment except the base in the centre ; the fifth 

 segment, the second ventral segment laterally, and the 

 legs, yellow ; the petiole and second abdominal segment 

 ferruginous, except the yellow and a black mark on the 

 latter. Clypeus a little gaping at the apex, which is black 

 and incised. Eyes parallel. Hinder ocelli separated from the 

 eyes by near the same distance they are from each other. 

 Body covered with longish pale fulvous pubescence, almost 

 golden on the face ; the punctuation is strong and coarse ; the 

 scutellum strongly punctured. Trigonal region rugose, and 

 with some stout keels ; the central furrow deep. Petiole 

 distinctly longer than broad ; pygidial area elongate, gradu- 

 ally narrowed towards the apex, which is almost transverse, 

 but with the edges rounded ; the incision in the hypopygium 

 is a little longer than wide, rounded at the base, and becom- 

 ing wider towards the apex ; the top of the pygidial area is 

 irregularly punctured, without a hair fringe, and covered 

 with long pale pubescence. The coxae are black at the 

 base ; the hinder femora are for the greater part black ; the 

 hind tibiae are fuscous on the outer side at the apex. Antennae 

 rufous ; the third joint curved, twice the length of the second 

 and longer than the fourth. The wings are suffused with 

 fuscous ; the apex broadly smoky ; the second cubital cellule 

 has the peduncle not much shorter than the cellule ; the 

 first recurrent nervure is received in the basal fourth ; the 



