HYMENOPTERA. 199 



APPENDIX. 



15. ODONTOMACHUS BISPINOSUS. B.M. 



Worker. length 3 lines. Black: the mandibles, antennae 

 and legs ferruginous. The head deeply emarginate behind, lon- 

 gitudinally and finely striated, with the sides behind the eyes 

 smooth and shining. The thorax rugose, with two minute spines 

 on the metathorax. Abdomen smooth and shining, with the 

 apex pale testaceous; the node of the peduncle armed above 

 with two stout acute spines, directed outwards. 



Hab. Brazil (Ega). 



This very distinct species we have just received from Mr. 

 Bates ; at its side on the same piece of card is a specimen of a 

 species of Cylistes, a genus of Histeridce ; this seems to indicate 

 some connexion between them ; probably the Beetle was found 

 in the nest of the Ant, but we have no information on the sub- 

 ject. 



3. ANOMMA RUBELLA. 



Anomma rubella, Savage, Proc. Acad. Nat. Sci. Philad. iv. 196 



$ (1850). 



Hab. Africa (West Coast of the Gaboon River). 



At page 200 of the Proceedings of the Academy is a paper, 

 which suggests the identity of Anomma with Dorylus; this is 

 founded on the fact of Dr. Savage having found specimens of 

 Dorylus in company with Anomma rubella ; and in a small phial 

 forwarded to the Society, containing the Anomma, were three spe- 

 cimens of Dorylus planiceps, which Dr. Savage considers to be 

 the perfect insect. Notwithstanding this opinion and the details 

 which follow, I must state my doubts of there being any con- 

 nexion between these insects ; they were not found together in a 

 nest, but on the ground ; and I am at present ignorant of any such 

 disparity in size, or even an approach to it, occurring in the whole 

 group of the Formicida, more particularly between males and 

 workers. I must add, that I do not consider the evidence suffi- 

 cient : I should certainly expect to find the male possessing the 

 same number of joints in the palpi as the worker, which in this 

 case is not so : Anomma has 2 joints in both the labial and max- 

 illary palpi ; in Dorylus I can only discover 1 labial and 2 max- 

 illary joints. In India, where Dorylus is common, Anomma has 



