ibd MODERN CLASSIFICATION OF INSECTS. 
S. Areolarit. Clypeus entire, vertex more cr Jess emarginate behind, abdomen 
6- to 7-jointed, second submarginal cell (when present) very small. 
4. Cyclostomi. Clypeus deeply notched, leaving a circular aperture between it 
and the jaws, abdomen generally 6- to 7-jointed, second submarginal cell 
(when present) large. 
B. Exovonres. Having the teeth of the mandibles directed outwards, the man- 
dibles, when closed, not touching each other. 
Mr. Haliday, who has been so kind as to furnish me with the generic 
synopsis of the Ichneumones Adsciti, added as a distinct sub-family 
the Aphidii and allied genera, which have the articulation between 
the second and third abdominal segments flexible. I, however, regard 
them as a group equivalent with Wesmael’s other sections, and which 
it might perhaps be more natural to arrange either before or after the 
Polymorphi, with which they are united by Wesmael. This might be 
done by inverting the arrangement of these sections, so that the A phidii, 
which are the least perfectly organised of all the Ichneumonide, 
might be retained at the end of the family. 
“The habits of the Ichn. Adsciti or Braconides,” as well observed by 
Haliday (nt. Mag. vol. i. p.482.), “so far as ascertained, presenting no 
broad distinction from the rest of the family,” I have thought it most 
advisable to treat of the economy of the entire family at once, without 
introducing that of each under the descriptions of the two sub-families 
which would have required much repetition. Many of the genera 
exhibit various interesting peculiarities of structure, as, for instance, the 
partial or complete coalition of the dorsal segments of the abdomen in 
Chelonus (fig. 75. 18.), Sigalphus, Rhitigaster, &c. (fig. 75. 17.); the 
gaping mandibles of Alysia (jig. 75. 15.); the rostrated front of 
Agathis (fig.’75. 16.) ; the anomalous antenne of Streblocera Westw. 
(jig. 75. 19., 75. 20. wing of ditto); the paucity of joints of the 
antenne in some of the Aphidii and other aberrant genera; the very 
elongated ovipositor and variegated wings of many Bracones ; and the 
existence of a stigma on the front margin of the posterior wings of the 
males in Heterospilus and Hecabolus. 

The family CHatcrpipa* Westw. (Cynipsera Latr. Genera, Ptero- 
malini Dalm., Diploleparize Spinola), is composed of a very great 

* Bistiocr. Rerer. To tHE CuHaLcipips. 
Swederus, Beskrifning, §c., in Vetensk Acad. nya Handl. 1785. (Pteromalus. ) 
Kirby (n. sp. Eulophus), in Linn. Trans. vol. 14, — Ditto, in ditto, vols. iii. iv. v. 
( Various species. ) 
