104 



A Catalogue of tlie Species of An ts [No. 39, 



4th, Odontomachus, differs from the last in the one abdominal 

 pedicle ending superiorly in a spine ; antennae very slender and 

 filiform in the neuters ; head oblong, much notched posteriorly, 

 jaws long, narrow, parallel, three toothed. 



5th, Myrmica, with sting — abdominal pedicle with 2 knots, jaws 

 triangular, maxillary palpi long. 



6th, Atta, differ from the last only in its short palpi, head of 

 neuters usually very large. 



7th, Cryptocerus, also with a sting, 2 knots in the abdominal 

 pedicle, head very large and flattened, with a cleft on each side to 

 lodge part of the antennae. (Peculiar to South America.) 



St. Fargeau in the 1st volume on the Hymenopteres in the Suites 

 a BufTon divides the Ants thus : 



1st Tribe, Les Myrmicites, females with a sting, 1st sigment of 

 abdomen of 2 knots. This includes the following genera. 



1st Cryptocerus. 2d Atta. 3d Ocodoma. Differing from Atta in 

 its larger head, and the presence of spines. 5th Myrmica. 

 2d Tribe, Les Ponerites. 



Females with sting, 1st sigment of abdomen of one knot only. 

 It includes the genera Odontoomachus and Ponera. 

 3d Tribe, Les Formicites. 



Females without a sting. 1st sigment of the abdomen of one 

 knot only, and it contains the genera Polyergus and Formica. 



It will be, shortly, seen that many of our Ants cannot be well re- 

 ferred to any of these genera, but as it is probable that some new 

 genera have been formed by recent writers, I shall in general con- 

 tent myself with referring most of my species to one or other of 

 those here characterized. 



Following the arrangement of St. Fargeau, we have first the 

 tribe of Myrmicides and the first genus mentioned by him Crypto- 

 cerus being American exclusively, we come to the genus Atta of 

 the Latreille from which St. Fargeau has separated Ocodoma, the 

 chief distinction being the spines which exist either on the head or 

 thorax of the latter, which moreover is said to have the head of 

 variable size, whilst in Atta it is said to be usually not of a large 

 size. We have in India species belonging apparently to both 

 groups which I shall now endeavour to describe. 



