188 CRABRONID&. 
in a ring; their tarsi of the same colour, with their terminal 
joints piceous; the legs less spinose than in the @. 
¢ ¢ in my own Collection. 
+4:+ This species, which was first described by V. d. Lin- 
den, is tolerably common at Highgate. Panzer’s synonyme 
certainly belongs to the ¢ of Psen atratus. 
Genus XX V.—Passatacus. Shuck. 
Heap subglobose, wider than the thorax ; eyes lateral, ovate ; 
stemmata placed in a triangle on the vertex near the forehead ; 
antenne inserted at the base of the clypeus, not approximate, 
the scape obconical, the pedicel subglobose, the joints of the 
clavolet cylindrical ; clypeus transverse, convex, marginate in 
front, where it is slightly produced and tridentate, or merely 
obsoletely so; /abrum entire, triangular or semicircular ;_ man- 
dibles gradually widening towards the apex, where they are bi- 
or tridentate, in the former case the inner tooth is molar. 
THorax sublinear ; collar transverse, slightly constricted into 
a short neck; scutellum transverse, lunate; metathorax elon- 
gate, obtusely truncated at its extremity; the superior mings 
nith one marginal cell acuminate beyond the second submarginal 
and two submarginal cells, the first oblong receiving the first re- 
current nervure near its extremity, the second transverse, slightly 
narrowed towards the marginal cell, and receiving the second 
recurrent nervure about its centre; the legs moderate, slender, 
simple. The Azspomen elongate, subsessile, the second seg- 
ment constricted slightly at its base, as also the third, but less 
so; the terminal segment in the $ produced into an upeurved 
spine. 
Type, P. insignis, V.d. Lind. 
+++ I called this genus Xylecus in my table, in refer- 
ence to its dwelling in wood, and it was printed before I 
discovered that Serville had used the same for a genus of 
