Patton.] , 380 [Jauu- 21, 
the next subsequent author had the right to decide to which section 
the name should be restricted. It was therefore, proper for Jurine 
to select lobata as the type of Chlorion (which he considered 
to constitute only a section of Sphex), and to apply a new gen- — 
eric name, Ampulex, to compressa. This application of the names 
Chlorion and Ampulex is also in conformity with general usage. 
The 3 of Ampuiex has the mandibles armed with a tooth, the man- 
dibles of the female are unarmed. | 
IsopoNTIA ! n. g. 
Type: Isodontia philadelphica. (Sphex philadelphica Lepel.; Sphezx 
apicalis Smith, Cat. Hym. B. M., rv, 262.) 
Clypeus of the ? with a notch in the middle of the elevated 
anterior border, and a short tooth on each side of the notch; clypeus 
of the male simple or with a slight crenulation. Margin of the 
labrum finely pubescent; labrum of female with a median carina, 
and armed with two spines or teeth at the apex. Mandibles short, 
terminated in both sexes by three teeth of equal, or nearly equal 
length. Marginal cell not extending beyond third submarginal, third 
submarginal receiving the second recurrent nervure near its base ; 
the second submarginal usually longer than in Sphex. Anterior 
tarsi armed with short spines, not pectinate externally in either sex, 
the exterior spines being no longer than those within. Tarsal claws 
bidentate beneath, the outer tooth as large as the inner or larger. 
Only two bristles between the claws. Petiole of the abdomen more 
than twice the length of the posterior coxe, the abdomen narrowed 
towards the petiole, depressed. 
Isodontia philadelphica. 
Labrum of female with a slightly incurved spine at the apex on 
each side of the median carina which is present, the labrum slightly 
roughened, its border slightly sinuated between the spines; labrum 
of male rounded anteriorly, without carina and not roughened. 
Mandibles of female black; of male, varied with ferruginous. Cly- 
peus of female with a broad and slight notch. 
Isodontia elegans. Sphex ogee Smith., Cat. Hym. B. Mag, 
262, 3. 
Labrum of the female with two short teeth at the apex, from each 
of which an oblique ridge extends backwards, the median carina 
1 Toos + dons. 
