4 HYMENOPTERA. 



11. DORYLUS ATRICEPS. 



Dorylus atriceps, Shuck. Ann. Nat. Hist. 1st ser. v. 323. 10 (1840). 

 Westw. Arc. Ent. i. 80. 10. 



Hab. Africa (Gambia). (Coll. F. Smith.) 



Sect. 5. — Peduncle cup-shaped, as large as the following seg- 

 ment j the mandibles broad and nearly triangular. 



12. Dorylus atratus. 



Length 9 lines. — Black, with a silky brown pubescence ; elon- 

 gate and cylindrical : head as wide as the thorax ; the ocelli in 

 a triangle on the vertex, which is very convex ; antennae short 

 and setaceous, the scape more than half the length of the fla- 

 gellum. Thorax : the mesothorax with an impressed longitudinal 

 line on each side, two-thirds of its entire length, terminating at 

 the base of the scutellum ; wings blackish brown, with a slight 

 violet iridescence, the nervures black ; the recurrent nervure in- 

 serted a little beyond the middle of the first submarginal cell ; 

 femora elongate, triangular, much narrowed at the apex. Abdo- 

 men cylindrical ; the peduncle cup-shaped, nearly as large as the 

 second segment, its posterior margin rounded ; beneath com- 

 pressed into an angular form, and densely pubescent. 



Hab. Old Calabar. (Coll. F. Smith.) 



Genus 2. RHOGMUS. 

 Rhogmus, Shuck. Ann. $ Mag. Nat. Hist. 1st ser. v. 323. 4 (1840). 



1. Rhogmus fimbriatus. Plate I. fig. 2. B.M. 



Rhogmus fimbriatus, Shuck. Ann. fy Mag. Nat. Hist. 1st ser. 

 v. 325. 1 (1840). 



Westw. Arc. Ent. i. 80. 1. 



Hab. Africa (Gold Coast ; Gambia). 



Genus 3. LABIDUS*. 

 Labidus, Jurine, Hym. p. 282 (1808). 



Sect. 1. — Peduncle of the abdomen subtriangular and concave 



above. 

 1. Labidus Fargeavii. 



Labidus Fargeavii, Shuck. Ann. Nat. H st. 1st ser. v. 198. 1(1840). 



* The females of this genus are not known. Mr. Shuckard has 

 indicated their probable connexion with the genus TypMopone. 



