a Family of the Hymenoptera Heterogyna. 319 



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

 longitudinal impression at its apex; metathorax elongate*, abruptly 

 truncated at its apex, where it is fringed ; mesothorax slightly corru- 

 gated in front on each side of the two abbreviated parallel longitudinal 

 central lines, the wrinkles parallel with the suture that separates it 

 from the prothorax : wings somewhat obscure, with their nervure* 

 blackish or dark brown, the radial nervure terminating half way be- 

 tween the commencement and the inner angle of the marginal cell, 

 and where it loses itself in the coloured portion of that cell; the cu- 

 bital nervure slightly undulated as far as the insertion of the recurrent 

 nervure, beyond which to the termination of the cell it is straight ; the 

 recurrent nervure also straight, and inserted at rather less than one 

 half the length of the first submarginal cell ; legs castaneous, femora 

 elongate triangular, acuminated towards the apex, the outline be- 

 neath slightly rounded downwards, the trochanters of the four poste- 

 rior strictly adhering and not projecting beyond the lower outline of 

 the femora. 



Abdomen elongate, cylindrical, the peduncle quadrate convex, (its central 

 portion viewed laterally triangular,) fringed at the apex, where it has 

 a slight transverse ridge, nearly as broad as the following segment, 

 which and the third are also quadrate, the terminal segment very 

 pilose. 



In the collections of the Zoological Society. 



This insect is from Barbary, where it was captured by Capt. Lyon. 

 It closely resembles the following, from which, however, the size of 

 the head, proportions of the peduncle, and two first segments of the 

 abdomen chiefly distinguish it. Besides which, the femora in the 

 present form a less acute triangle, and the radial nervure is much 

 shorter and less distinctly terminated. It is remarkable that Bar- 

 bary and India should produce species so closely resembling each 

 other, when the vicinity of the Gambia, within a very limited di- 

 strict, furnishes others greatly differing among themselves. 



Sp. 6. Dor. labiatus, Shuck. Length 14^ lines. 



Expansion 23 hnes. 

 Pallide brunneus sen rufo-testaceus glaber^ facie pilosd subtuberculatd prO' 

 minula, in medio prqfunde sulcata, mandibulis attenuatis, labro tuberculis 

 binis magnis instructis et pedunculo abdominis quadrato vel potius std>' 

 globoso. 

 Pale brown, inclining to fuscous, with long curling hair upon the face, be- 

 neath the coxae, and at the apex of the abdomen : head black, except 

 the antennae and mandibles, which are castaneous; face slightly tuber- 

 culated a little to the side and in front of the posterior ocelli ; fore- 

 head not unusually prominent j ocelli large and disposed in an obtuse 



* In speaking of the metathorax as elongate, it is meant comparatively. 



