224, CRABRONIDZ. 
Hampstead Heath, on a spot frequented also by Wysson 
dimidiatus and Hedychrum roseum, and the ? I have 
taken at Highgate in sandy situations, in which it bur- 
rows; it is excessively active in its flight, and the ¢ runs 
along the ground like a Pompilus, and is very difficult to 
secure. 
II. Antenne inserted in the middle of the face, always larger 
towards their extremity. 
1. Clypeus almost square, not trilobate. The first segment 
of the abdomen forming a long, slender, sudden petiole. 
Genus XXXII.—Psen. Latr. 
Heap transverse, convex, as wide as the thorax; eyes oval, 
placed at the lateral angles of the head, very distant; the 
stemmata placed in‘a triangle on the vertex, slightly raised ; 
the face below the antenne and clypeus generally, sometimes 
the clypeus only, covered with a dense silvery pubescence ; 
the antenne inserted in the middle of the face, and sub- 
clavate; the clypeus transverse, rounded in front; labrum 
concealed ; mandibles bidentate. The rHorax rotundate; the 
collar transverse, linear; the scutellum transverse; the meta- 
thorax truncated ; the superior wings with one marginal cell 
very long, and extending to nearly the apex of the wing, and 
three submarginal cells, the first very long, and the second and 
third much narrowed towards the marginal cell, and each re- 
ceiving a recurrent nervure near their commencement, the third 
cell distant from the apex of the ming ; the legs simple, short, 
and having a large pulvillus placed between their bifid claw. 
The aspomeN ellipsoid, attached to the thorax by an elon- | 
gate abrupt petiole, forming the anterior half of the first 
segment, which is either plane above or carinated, the hypo- 
pygium of the 4 prolonged into an acute upcurved spine. 
Type, P. ater 9. Pang. 
