HYMENOPTERA, — ICHNEUMONIDAY 153 
in some exotic species three or four inches in length; Ophion Faé., 
having the abdomen greatly compressed and sabre-shaped; Euceros * 
Grav. and Joppa Fabr., having the antennz dilated in the middle; 
of the former genus males only have been observed; and Hellwigia, 
(for which I am indebted to Dr. F. Klug) having the antenne 
strongly clavate at the extremity in both sexes. The interesting genus 
Agriotypus Walk. ( fig. 75.14. A. armatus ¢ , for which I am indebted 
to F. Walker, Esq.) is remarkable for its long curved petiole to the 
abdomen, spotted wings, and spined scutellum ; the radial cell is short, 
whence, as well as in the form of the abdomen, it appeared to Latreille 
to form the connecting link between the Ichneumonide and Procto- 
trupide. Its palpi and the cubital cell of the fore-wings, however, 
evidently prove its affinity with the true Ichneumonide ; although Mr. 
Haliday, on account of the want of articulation between the second 
and third dorsal segments of the abdomen, has formed it into a dis- 
tinct family: but this latter character is proved by such genera 
as Chelonus, Sigalphus, &c., to be but of secondary importance 
amongst the Ichneumonide. 
The sub-family Braconides (Ichneumonides Adsciti E’send.), on the 
other hand, is characterised by having only one recurrent nerve, which 
unites with the nerve, (almost always present) extending between 
the first cubital and externo-discoidal cells; the second sub-marginal 
cell being often as large as the preceding, and not receiving a recur- 
rent nerve, and the non-existence of articulation between the second 
and third dorsal segments of the abdomen. In Agathis and some 
Microdi and Microctoni the nerve between the first cubital and ex- 
terno-discoidal cell is obliterated, as in the genuine Ichneumons. 
M. Wesmael divides the Braconides as follows: — 
A. Ewvopontrs. Having the teeth of the mandibles directed inwardly. The 
mandibles meeting together when shut. Divisible into 
1. Polymorphi. Clypeus entire, abdomen 6- to 7-jointed, posterior part of the 
vertex convex, second submarginal cell (when present) large. 
2. Cryptogastri. Clypeus entire, posterior part of vertex conyex, abdomen 
dorsally presenting not more than two transverse sections, second submar- 
ginal cell (when present) large. 
* From the similarity of this name to Eucera, another Hymenopterous genus, 
I have proposed to alter it to Eumesius. The species of this genus are extremely 
rare, and I am, therefore, happy in being able to’state the history of Mr. Curtis’s 
specimen of E. crassicornis, which was reared by the late Mr. Blunt from Achatea 
piniperda, as that gentleman informed me some time before his decease. 
