ofN eio Exotic Aculeate Hymenoptera. 79 
Division 2. (Pisonitus, Shuck.) 
The first recurrent nervure received towards the apex ofi the first 
submarginal cell, and the second recurrent received about the middle 
of the second submarginal cell. 
Obs. — In adhering strictly to the neuration of the wings as a 
distinctive character for generic subdivision in the Aculeate Hyme- 
noptera, it would be proper to consider this as a genus, but I am 
less inclined to adopt it as such here, from the circumstance that 
all the preceding species vary in the mode of receiving the recur- 
rent nervures, and in the size of the second submarginal cell, and 
also because there is no other character to support this generic se- 
paration. In adopting this same principle in my “ Fossorial Hy- 
menoptera,” upon separating Mimesa from Psen, and Celia* from 
Stigmus, my views have been supported by general habit, but here 
it is not so. 
Species 8 . Pison rufipes, Shuck. 
Niger ; mandibulis basi, palpis pedibusque rufis ; tegulis testaceis ; 
metathorace oblique striato $ . 
Length lines. 
Black ; delicately punctured ; the face beneath the antennae, the 
clypeus, the cheeks, the collar, and sides of the segments of the 
abdomen, all covered with a silvery down. The mandibles and 
palpi rufescent. 
The metathorax obliquely striated ; the central carina distinct ; 
the tegulee testaceous ; the wings slightly clouded with fuscous, 
their nervures black. The legs red, with the exception of the an- 
terior pair of coxae, trochanters, and femora, and the base of the 
posterior coxae ; the tibiae and tarsi simple. 
The abdomen somewhat less shining than in its congeners. $ . 
From Van Diemen’s Land. 
In the Collection of Mr. Westwood, and in my own. 
Species 9. Pison argentatus, Shuck. 
Ater, argenteo-pubescens ; metathorace oblique striato, striis distantibus, 
inter stitiis punctatis ; alls hyalinis, tegulis testaceis. 5 . 
Length 3 lines. 
* This name I have discovered since my book was printed is pre-occupied, Zim- 
merman having used it to designate a genus of the Harpalidte in his monograph of the 
Zabroides : but this would have been of no consequence whilst it was merely a name; 
but he has since characterized the genus in a paper on the Amaroides in the 
“ Faunus” of Gistl. It is, therefore, necessary to change my name, and I propose 
in lieu Spilomena , from rm ’Kaifj.a, ruevus, the synonyme of 
