a Family of the Hymenoptera Heterogyna. 321 



the head and throughout the thorax : head red, mandibles and scape 

 of the antennae castaneous, the latter about one-fifth the length of the 

 entire organ, which is filiform and elongate ; ocelli disposed in a tri- 

 angle at the vertex, large, with less space than the diameter of one be- 

 tween the posterior and anterior, in front of which the face (which 

 is very convex) is deeply sulcated : mandibles very broad and very 

 slightly curved, their inner edge acute and nearly straight. 



Thorax silky, the pleurae shining, gibbous in front and at the scutellum, 

 which is slightly longitudinally impressed in the centre; metathorax 

 rather elongate, slightly rounded at the apex, very pubescent : wings 

 clouded with a fuscous tinge, their nervures dark brown, the cubital 

 deeply bisinuate, the first sinus dipping into the second discoidal cell, 

 and the second beyond the recurrent nervure, which is straight and 

 inserted at rather more than two-thirds of the length of the first sub- 

 marginal cell : legs castaneous, the femora elongate-ovate, their out- 

 line rounded both above and below. 



Abdomen with a rich satiny reflection, the peduncle quadrate, gibbous, the 

 ventral portion slightly produced and boat-shaped, the remaining seg- 

 ments transverse, the sexual organ protruding at the apex of the ter- 

 minal segment and fringed. 



In the collection of Mr. Westwood. 



This species is from Bengal, whence it was brought by W. W. 

 Sanders, Esq. The differences between it and the next are but slight, 

 and perhaps not specific. I make the descriptions parallel that they 

 may be compared. 



Sp. 8. Dor. longicornis, Shuck, Length 11^ lines. 



Expansion 18 lines. 



Helvolus subpubescens ; cupite nigro convexo facie in medio sulcata, man- 

 dibulis subtrigonis, pleuris obscuris ncrvo cubitali subrectis, petiolo abdo- 

 minis quadrato gibboso. 



Reddish testaceous with longish hair about the face and thorax, and especially 

 beneath the peduncle and apex of the abdomen; head black, except 

 the mandibles, which, as well as the scape of the antennae, are pitchy, 

 the latter not more than one-fifth the length of the entire organ, which 

 is filiform and elongate; ocelli disposed in a triangle at the vertex, 

 large, with less space than the diameter of one between the posterior 

 and anterior, in front of which the face (which is very convex) is 

 deeply sulcated ; mandibles very broad and very slightly curved, their 

 inner edge acute and nearly straight. 



Thorax obscure, gibbous in front and at the scutellum, the latter with a 

 slight impression in the centre of the apex; metathorax slightly pro- 

 duced and rounded posteriorly, somewhat silky : wings fuscous, their 

 nervures reddish brown, the cubital straight, the recurrent slightly 

 curved outward and inserted at less than two-thirds of the length of 



