ii6 HYMENOPTERA ACULEATA. 



the vertex, mandibles pitcby brown, clypcus, sides of the 

 face, a trifid spot in the S , and a bifid spot in the ? above 

 the clypeus, and a spot behind the vertex yellow ; thorax 

 black, hairy like the head, pronotal collar and post-scutellum 

 and sometimes a spot on the scutellum yellow, mesonotum 

 coarsely punctured, propodeum very finely and closely so, 

 basal area very large, limited by an indefinite impressed 

 line ; abdomen yellow, deeply and somewhat closely punc- 

 tured in the ^, remotely and shallowly in the ?, apices 

 of the segments slightly impressed, each segment except 

 the apical with a triangular black band at the base, varying 

 much in extent and shape ; legs yellow, femora black at 

 the base. 



L. 10-15 mm. 



Local. I have no notes of recent captures. 



Heron Court, Hants; Sandown Bay, Isle of Wight, 

 abundantly; Pegwell Bay; Byfleet ; Snaresbrook; July 

 and August; (F. Smith). 



CERCERIS, Latr. 



This genus, which has been monographed by Schletterer 

 in Zool. Jahrbuch II., p. 349-510, is somewhat like the 

 preceding, but may be known from it, and in fact from all 

 the other genera of the Sphegidse by the deep constrictions 

 between the abdominal segments ; the head is as wide as or 

 wider than the thorax, the eyes entire, the antennae filiform, 

 the clypeus in the ^ has a dense fringe of shining hairs 

 on each side at the apex, and in the ? of some species is 

 raised in the centre, face between the antennce in the ? with 

 a sharp carina ; wings with three submarginal cells, the 

 second petiolated, propodeum with a well-defined basal area ; 

 abdomen subparallel-sided, with the first segment narrow 

 and almost nodiform, the rest constricted at the base and 

 apex, apical segment dorsally with a basal transverse carina 

 extending along the sides to the apex, pygidial area well- 



