HYMENOPTERA. 10] 
Some present a remarkable hiatus between the mandibles and the 
clypeus. The maxillz are prolonged inferiorly beneath the man- 
dibles. The second cubital cell is square and tolerably large. The 
ovipositor is long. They form the genus 
Bracon, Fab. Jur. 
From which we might separate, as was formerly done by me, under 
the generic denomination of Vipron, those species in which the an- 
tennz are short and filiform; in which the maxille are proportion- 
ally longer, and with the labium form a sort of rostrum; and where 
the maxillary palpi are hardly longer than the labials. 
The species with sctaceous antennz, at least as long as the body, 
in which the maxillary palpi are much longer than the labials, and 
where the maxillze and labium form that sort of rostrum under the 
mandibles, would alone be Bracones(1). 
The others present no hiatus between the mandibles and clypeus. 
The maxillz and labium are not prolonged. The second cubital cell 
is very small. The ovipositor, and even the abdomen are short. 
MicrocasTer, Lat.(2) 
Our third and last division, corresponding to that of the Bassus 
of M. Nées d’Esenbeck, has, like the first, four joints in the labial 
palpi, but the maxillary palpi consist of more, that is to say of six. 
The abdomen is semi-sessile. 
Here, the mandibles become gradually narrowed, and terminate 
as in the preceding Insects, by two teeth, or in an emarginated or 
bifid point. 
HeExcoy, Esenb. 
Where the abdomen, viewed above, presents several annuli, ter- 
minates in a long ovipositor, and is not concave beneath(3). 
SicaLpuus, Lat. 
Where the abdomen is concave inferiorly, presents but three 
(1) See Lat., Gen. Crust. et Insect., IV, 9; and Encyc. Méthod., Hist. Nat. In- 
sect., X, p. 35. ; 
(2) Lat., Ibid. 
(3) Nées d’Esenb., Conspect. Gener. et Famil. Ichneum., p. 29. 
