HyMENOPTERA. 



221 



In those, the abdomen is connected witli the tliorax by the greater 

 portion of its transversal diameter, is almost sessile, nearly cylindri- 

 cal, and simply widened or thickened towards its posterior extre- 

 mity. Such are the 



Peltastes, Iltifj. — Metopius, Panx., 

 Where there is a circular elevation under the antennae, and the 

 lateral edges of the scutellum are turned up and sharp *. 



In the second and last division of those species in which the max- 

 illary palpi are composed of five joints and the labials of four, we ob- 

 serve a profoundly emarginated or almost bifid ligula, and maxillary 

 jjalpi, the joints of which differ but slightly, or change their figure 

 very gradually. The ovipositor projects and is covered at base by a 

 large lamina formed like a vomer. The posterior thighs are thick. 

 The head in several projects in the manner of a snout. 



Ac^NiTUs, Lat., 

 When the head presents no anterior projection in the form of a 

 rostrum f. 



Agathis, Lat., 

 Where it terminates" inferiorly in that manner. These Insects ap- 

 proach the following subgenera by their wings J. 



Our second division of the Ichneumons only differs from the first 

 with respect to the number of joints in the palpi, inasmuch as there is 

 one less in the labials, which present but three. As in most of the 

 species of the following division, the second cubital cell is most fre- 

 quently as large as the first, and nearly square. The ovipositor pro- 

 jects. The point of the mandibles is emarginated or bifid. 



Some present a remarkable hiatus between the mandibles and the 

 clypeus. The maxilla; are prolonged inferiorly beneath the mandi- 

 bles. The second cubital cell is square and tolerably large. The 

 ovipositor is long. They form the genus 



Bracon, Fab. Jur., 

 From whicli we might separate, as Avas formerly done by me, under 

 the generic denomination of Vipion, those species in which the an- 

 tennee are short and filiform ; in which the maxillae are proportionally 

 longer, and with the labium form a sort of rostrum ; and where the 

 maxillaiy palpi are hardly logger than the labials. 



The species with setaceous antennae, at least as long as the body, 

 in which the maxillary palpi are much longer than the labials, and 

 where the maxillae and labium form that sort of rostrum under the 

 mandibles, would alone be Bracones §. 



The others present no hiatus between the mandibles and clypeus. 



* Ichneumon necatorius, Fab. ; Panz.,Faun. Insect. Germ., XLVII, 21 ; — Ich. 

 migratorius. Fab. -.— Ich. amiclorivs Panz., Ibi(l.,LXXXV, 14; — Ich. dissectorius, 

 Panz., Ibid., XCVIII, 14. See Encyc. Method., article Pdtasfc 



t Lat., Gen. Crust, et Insect., IV, 9; Encyc. Mcjthod., Hist. Nat. Insect., 

 X, 37. 



t Lat., Ibid., 9; Encyc. Method., Ibid, 38, 



§ See Lat., Gen. Crust, et Insect., IV, 9 ; and Encyc. Method... Hist. Nat. In- 

 sect., X, p. 35. 



