56 PROCEEDINGS OF THE ACADEMY OF 



MoNOXiA. The characters derived from the claws appear to 

 me to be certainl}' sexual ; hence, 31. obtusa, gnUulata, and debilis 

 are not in ray opinion separable ; the type of 31. angularis has tlie 

 angles of the thorax more developed, but that is a character to be 

 used with caution; 31. consputa is distinct by the black suture, and 

 31. sordida by the thick pubescence. 



Trihabda. This genus includes G. vibiirni, Payk., and was 

 separated by M. Joannis as a subgenus under the name PyrrhaUa 

 in 1866; the species are very hard to define, and the increased 

 material before me leads me to different results from those arrived 

 at by Dr. Leconte. Nevertheless, he does not, I believe, coincide 

 in the views here expressed, preferring to retain these species as 

 distinct. 



T. tomentosa, canadensis, and virgafa., I 'consider as forming 

 one variable species, with black vittse and black scntellum ; T. 

 Jlavolimbata and T. luteocincta form another, with blue vittne, to 

 which may ultimately be added T. attennata ; T. co7ivergens ap- 

 pears distinct ; T. nitidicollis and T. brevicoUis have a more or 

 less white scutellum. 



There is still a form brought abundantly' from Xew Mexico by 

 Dr. Lewis, which closely resembles T. nitidicollis in form, and 

 the white scutellum, but is much smaller, and the thorax is dis- 

 tinctly punctate. This variety (or species) I propose to name T. 

 Lewisii ; and it is most interesting on account of the links it 

 affords. The specimens were taken with T. nitidicollis, the vittse 

 vary from metallic green to dull black, and vary slightly in extent. 



Tribe Hallicini. 



Prosternum separating the anterior coxa?, elytral cpipleurae reaching the 

 apex, legs saltatorial. 



A. Posterior tarsi with the last joint inflated. 

 B. Elytra striate punctate. 



C. Elytra pilose. UypolamjiRU. 



Co. r.lylra glabrous. < j i/ 



\ Fhadimus. 



Bo. Elytra punctate. ] 



K (EdionycfM. 



Ab. Posterior tarsi simple. 



B. Claws simple or dentate. 



