XX. TRYPOXYLON. 119 
fluent depression of the face; the emargination of the eyes 
much depressed, and also a channel on each side extending from 
the base of the antenne to this emargination for the reception of 
their scape ; these parts, as also the face beneath the antenne and 
the clypeus, are covered with a silvery pubescence; the antenne 
subclavate, the terminal joint short and straight and somewhat 
obtuse at its apex; the clypeus slightly produced in its centre, 
which is emarginate; the mandibles and palpi testaceous, the 
former black at their extreme base. 
The thorax has a silvery reflection at its sides; the base of 
the metathorax is enclosed, the enclosure divergently striated 
and having a central longitudinal impression interrupted at the 
apex of the basal enclosure ; the tegule testaceous; the wings 
very iridescent and clouded towards the margin; the legs black, 
with the knees of the anterior femora, front of the anterior 
tibize, and the anterior tarsi, testaceous, the two posterior pairs 
piceous. 
The abdomen black and shining, and the margins of the three 
first segments much constricted, with a silvery pubescence at 
the base and sides ¢. 
The ¢ differs only in having the antennze more clavate and 
obtuse at the extremity, and the knees of the femora being less 
coloured. 
$ @ in my own Cabinet. 
+++ This species I have taken at Hampstead and Da- 
renth, and a friend of mine has found it at Camberwell. It 
frequents, like its congener, holes in posts and palings, 
especially where Heriades campanularum nidificates. 
2, Eyes entire. 
A. One or two cubital cells complete. 
a. Mandibles very narrow or toothed at their extremity only ; 
one recurrent nervure. 
