J. M. ALDRICH. ^279 



PsiL.opoi>i:viJS. 



Bigot, Aniiales Soc. Ent. France, 269, 1890. 

 AMrich, Canad. Ent., Aug., 1904, 246. 



The genus is represented in America by a large number of spe- 

 cies, especially in tlie warmer regions. Many were described bv the 

 early writers without mentioning the essential characters. AVhen I 

 came to work up the Mexican and Central American Dolichopodi- 

 dse for Biologia Centeali-Americaiia, I found it necessary to under- 

 take a thorough study of all the American sj^ecies, so far as they 

 could be made out from the rich material furnished me, my own col- 

 lection, and the descriptions. The results, as far as they pertain to 

 the fauna in that work, will be found in Biologia, Dij^tera, I Suppl., 

 350-364, where twenty- three new species are described, and a table 

 of species given, the old name Psilopus being used. 



I find myself with a considerable residuum on hand, consisting of 

 four new North American and two South American species, which 

 for the sake of completeness I mentioned in my table, but could not 

 publish at that time on account of their being extra Hmital. The 

 descriptions are given herewith, preceded by a table of the American 

 species known to me { pilosus is the only exception — I have not 

 seen it). 



TABLE OF MALE SPECIES. 



1. Femora black 2. 



Feniora yellow 35. 



2. Wings with dark markings 3. 



Wings witiiout dark markings 22. 



3. Fore tarsi with dense black fringe on sides of 4th and 5th joints, middle tarsi 



with 2iid and 3d joints less broadly fringed (Mes.). 



bi fi nib rial u!^ Aldrich. 

 Fore tarsi of different structure 4. 



4. Fore tibiae black 5. 



Fore til>iie pale, at most somewhat brownish 9. 



5. Face with numerous, delicate, pale hairs (U. S.) patibiilatiis Say. 



Face destitute of pale hairs 6. 



6. Second joint of antennae with many very long bristles 7. 



Second joint of antennai with few and short bristles 8. 



7. Last four joints of fore tarsus short, subequal (West. U. S.). 



pilicornis n. sp. 

 These joints of gradually decreasing length (West. U. S., Mes.). 



melampus Loew. 

 b. The brown crossbands broadly connected on the fourth vein, leaving a round 

 hyaline drop in the first posterior cell (Brazil). 



giittula Wiedemann. 



Crossbands not connected behind ; 5th joint of fore tarsus slightly compressed, 



with silvery reflection on inner side (Mex.). . ■pra'Stans Aldrich. 



TEANS. AM. KNT. SOC. XXX. OC TOBEK. 1904. 



