26 Mr. H. W. Bates on the 



2. Oregostoma luridum^ Klug. 

 Stenopterus luridus, Klug, Entom, Bras. Spec, alter, p. 470, pi. 44. f. 3. 

 S. Brazil. 



Genus Ommata, White. 



Wliite, Long. Col. Brit. Mus. p. 194 ; Lacord. Genera, vol. viii. p. 502. 



White founded the genus Ommata on a species from Vene- 

 zuela, distinguished by its very long antennae, thickened and 

 not serrated towards the apex ; with this character are associated 

 vitreous narrowed elytra and tufted hind tibias. Lacordaire 

 considers these features of less generic importance than the 

 normal relative forms of the metasternum and abdomen and 

 the exserted anterior coxaa. In these latter points White's 

 insect agrees with a large number of species of the most diver- 

 sified forms and colom's ; and an examination of very copious 

 material has not yielded me any more definite generic distinc- 

 tions than those mentioned by Lacordaire. It is true that the 

 type, Ommata elegans^ and a second species that may be asso- 

 ciated with it, 0. Maia of Newman, differ from all the other 

 Ommatce (sensu Lacord.) in their vitreous elytral surface ; but 



0. clavicornis and some other species with opaque elytra come 

 very close to 0. Maia, and the genus would have to be split up 

 into a large number of smaller genera if Ommata were to be 

 restricted to the two species here named. The genus com- 

 prehends a series of species which for the most part are at once 

 distinguishable by their facies from Odontocera ; and in cases 

 of doubt I have treated the opaque and punctured elytra as a 

 differential character. 



The genus Agaone, Pascoe, which I formerly adopted, I find 

 on the examination of further material to be quite untenable ; 

 or if it be maintained, it must be restricted to the typical species, 

 A. notabilis. 



1. Legs long and slender ; middle femora gradually and moderately 



clavate. 



A. Elytra entire or nearly so. (Phoenissa.) 



1. Ommata [Phcenissa) nigrijpes, Serville. 

 Oregostoma niyripes, Serv. Ann. Soc. Ent. Fr. 1833, p. 552. 

 S. Brazil. 



2. Ommata {PJicemssa) Mpartita, n. sp. 

 0. nigripede gracilior, thorace magis cylindrico, elytrorum plus quam 



