psilopus. 243 



cisely of the same color as those of inermis, I cannot therefore re- 

 cognize this species of Walker in any of the species known to me. 



24. albicoxa Walk. Male and female. Of the species known to me, 



only P. scintillans approaches this species. Walker says of his 

 species that the fore and middle tarsi are hlack only at the tip, the 

 hind tarsi, however, entirely hlack witli the exception of the Bret 

 joint. In my species all the tarsi are of a uniform color, namely, 

 yellow near the root, hut from the tip of the first joint black-brown. 

 I cannot therefore take scintillans for Walker's albicoxa, and the 

 more so, as Walker's description contains no statements ahout any 

 plastic distinctions, which might serve as a clue to determination, 

 while scintillans possesses so remarkahle and so striking plastic 

 characters. 



25. lepidus Walk. The described male seems to belong to a species very 



nearly related to patibulatus, or to be this very species. After 

 Walker's description nothing more can be said about it. 

 2b". ungulivena Walk. The description agrees with none of the species 

 known to me. 



27. solidus Walk. The description of the female of a species with en- 



tirely black feet, from the relationship of patibulatus, which seems 

 to be distinguished from all similar species by a more robust struc- 

 ture of the body. The description, however, contains nothing which 

 would make it possible to determine this species with more cer- 

 tainty. 



28. peractus Walk. A female from the relationship of P. lonrjicomis and 



chrysoprasius. The characters stated are insufficient for its deter- 

 mination. 



29. haereticus Walk. A female from the relationship of the preceding 



species and similar to it, also described in a very unsatisfactory 

 manner. 

 3U. pernio dicus Walk. The male of a species remarkable by the slen- 

 derness of its body, and which Mr. Walker attempts to describe in 

 three lines and a half. I know of no species to which his descrip- 

 tion might be referred. 



Thus, the scanty result of the inquiries attempted on the pre- 

 viously published thirty North American species is the following: 

 Two species, diffusus Wied. and guttula Wied., must be stricken 

 out from the list of North American species. Of the other species 

 I recognize five among those in my possession, namely, sipho Say, 

 patibulatus Say, pallens Wied., and cliri/snprasi Walk. ; the first 

 three are reproduced below under the same names, the last one at 

 rhri/soprasius. There is a species which, very probably, is the 

 same with one described by me as new, namely, mundus Wied. 



