YS P2932 CRABRONIDA. 
Corynopus and Physoscelus are, by the former genus having 
in the é apparently twelve joints to the antenne, and the 
¢ having the anus somewhat canaliculated and acuminate, 
and in the latter genus the g having thirteen joints to the 
antennz, and the ¢ with the anus convex above, and of the 
ordinary form: but the ¢ in the former has certainly 
thirteen joints to the antenne like the latter; and I would 
ask, if a slight divarication in the form of the anus be suf- 
ficient to constitute a generic difference ? if so, the C. poda- 
gricus ought certainly not to have been placed by him in 
his genus Crossocerus, from which it differs materially in 
the form of that part, and, with my C. capitosus, in 
general habit approximates to these two species. But it is 
extremely irksome to find fault, and I therefore close my 
remarks with doing him the justice to retract what I have 
said at page eight of the Introduction relative to the an- 
tenn of some Crabrones, as the ¢ C. vagus and é C. 
Lindenii have apparently but twelve joimts, for I could not 
discover a thirteenth even with the assistance of my friend 
Mr. Bowerbank’s very powerful microscope. This ano- 
maly is exceedingly remarkable, and is at variance with 
what is observed in all the others of the fossorial Hyme- 
noptera. St Fargeau incorrectly considers the type to be 
the C. cephalotes, Pz., of which Fabricius, who is the 
author of the genus, first takes notice in his “ Systema 
Piezatorum ;” 
be referred to with regard to his confusion of the synonymy. 
I must further observe, that, to avoid unnecessary repetition 
in the specific character, it will be understood, that the 
stemmata are placed in an equilateral triangle, and the 
clypeus is covered with a silvery pubescence unless other 
wise stated. 
and my observations under this insect may 
