NATURAL SCIENCES OF PHILADELPHIA. 85 



deeper cliannel on the thorax ; the % also has the emargination of 

 the last segment partly filled up with an obtuse tooth. 



2.. D. divaricata (Say), Lee. p. 195. 



3. D. caudata, Lee. \. o. 



I cannot see that this is anything but a smaller, less developed 

 form of the last. 



4. D. pugionata (Germ.), Lee. 1. c. p. 196. 



Very distinct by the bidentate elytra ; the 'S has the last seg- 

 ment emarginate with a central tooth. 



5. D. mutica, Lee. I. c. 



Distinct from any other species by the convex prosternum ; the 

 unique '6 has the last segment with a broad emargination. 



6. D. obscura (Fab.), Lee. 1. c. 



7. D. baltimorensis (Hbst.), Lee. 1. c. p. 197. 



This species is founded on a single % which I cannot dis- 

 tinguish from D. obscura. The straight sides of the thorax are 

 peculiar to the % . 



8. D. soror, Lee. \. c. 



Based on a single 9 , D. obscura. 



9. D. lurida (Fab.), Lee. 1. c. 



After attentively examining about fifty specimens, I cannot 

 separate this species from D. obscura. No character of sculpture 

 is of any importance, and the sexual characters vary within cer- 

 tain limits ; thus the emargination in the % has sometimes a 

 short central tooth, and at others is simple, and the 9 has an 

 acute or truncate tooth in the middle. 



10. D. lepida, Lee. L c. p. 198. 



Closely allied to D. obscura, from which it differs by having the 

 thorax channelled, and the elytra with smooth reliefs. 



11. D. spreta, t Lee. 1. c. p. 198. 



This is Gory's asperata, according to the types in Mniszech's 

 collection. It has simple % tibice, as in D. lepida, but differs by 

 the short thorax. 



12. D. agperata, t Lee. 1. c. p. 199. 



This is the D. spreta, Gory, according to the types. The male 

 intermediate tibiie are dentate. 



