120 CRABRONIDE. 
Genus XXI.—Crasro. Fab. Lat, 
Heap very large, subrotund, in some species subquadrate, 
vertical in front; eyes very large, subtriangular, with the 
angles rounded, approximated at the base of the antenne, 
and very distant at the vertex, which is flat and at right angles 
with the face ; stemmata generally placed in the centre of the 
vertex; antennee geniculated, inserted at the base of the 
clypeus, and filiform in the females, in some males subfusiform, 
with the basal joints (excepting the scape, which is obconic, and 
the second joint) fornicate and fimbriated within, the apical 
joints serrated on the exterior—in others some of the joints 
are frequently emarginate beneath, and in some males they 
consist apparently of only twelve joints; clypeus transverse, 
longitudinally carinated in the centre and covered with a 
metallic pubescence ; mandibles bidendate, the inner tooth the 
largest and projecting considerably beyond the external one, 
both obtuse, and a dentate process towards the base within, 
in others merely unidentate. Tuorax ovate; collar linear 
' transverse ; scutellum lunulate ; metathorag very short, obtuse, 
with a subquadrate or subcordiform enclosure at its base, 
sometimes obsolete; superior mings with one marginal cell 
shghtly appendiculated, and one submarginal cell very long 
and recewing towards its extremity the single recurrent nervure ; 
legs short and robust, generally very spinose ; tarsi longer 
than the tzbie, the first pair of which in some males are dilated 
into a concavo-convex plate. AspomeEN subsessile, lanceolate 
or subclavate; in some the first segment prolonged into a 
kind of petiole and in others distinctly petiolated, the petiole 
constituting the first segment, which is subpyriform and nodose 
at its extremity. Type C. cribrarius. Lin. 
+4} The name Crabro is that of the hornet in Pliny. 
Fabricius first established it as a genus in his Systema 
Entomologia in 1775, but as usual it was a heterogeneous 
repository until Jurine’s system was introduced. It is 
