THE CANADIAN ENTOMOLOGIST. 247 



Schiner, Fauna Austriaca, Dipt., I., i8o, 1862 (Psilopus, Meig.). 



Loevv, Monogr, N. A. Diptera, II., 229, 1864 (id.). 



Aldrich, Kans. Univ. Quart, II., 47, 1893 (Gnamptopsilopu.s) ; Biologia 



Cent. Amer., Dipt., Suppl., 364, 1902, table of species (id.). 

 Coquillett, Jour. N. Y. Ent. Soc, X., 140, 1902, synonymy of 



Gnamptopsilopus. 

 Bezzi, Zeitsch f. Hym. u. Dipterologie, 1902, 191, adopts Sciapus. 



PSILOPODINUS. 



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



PBigot, Annales Soc. Ent., France, 1859, 215 (Oariostylus, Megistostylus, 



Mesoblepharius, Condylostylus, Eurostomerus, Dasypsilopus, Het- 



eropsilopus, Aedipsilopus). 

 PBigot, Annales Soc. Ent., France, 1890, 261-269 (Spathipsilopus, 



Eudasypus, Amblypsilopus, Tylochietus, Oariopherus). 

 Aldrich, Kans. Univ. Quart., IL, 47, 1893 (Psilopus in restricted sense). 



Notes. — I have seen all the literature cited except Zeller. The 

 Smithsonian Institution kindly loaned me Guerm-Meneville. 



The genera of Bigot, published in 1859 and 1890, are very badly 

 conceived, and not properly genera at all, nor even subgenera. The 

 descriptions of the type species hardly allow a definite opinion as to their 

 location in the two genera here adopted, but I incline to place most of 

 them in the second genus, with tegular cilia black. I chose to retain 

 Bigot's name Psilopodinus for this genus for several reasons. First, 

 sipho is mentioned among the types ; second, it is not based on purely 

 sexual characters (nor on much of anything else, I must admit) ; third, 

 it is an advantage to retain this name from its resemblance to Psilopus, as 

 the group includes Loew's larger section of Psilopus, and all that I referred 

 to that genus in my revision. 



The genus Agonosoma was supposed by its describer to differ from 

 Psilopus by a more elongated third antennal joint and a somewhat 

 different structure of the face and front. Two East Indian species were 

 described, /d^^/^/^rt' and inaadipenfiis. In these the antennae are yellow 

 or ferrugineous, with tip of third joint infuscated. The figure of the wing 

 of the first shows the third vein parallel at the lip with the fourth. These 

 two characters are quite distinctive, and I think we may safely assume that 

 the species also have pale tegular cilia, and are entirely congeneric with 

 Psilopus platyptents, which should, therefore, be referred to Agonosoma. 



The effect on nomenclature is as follows : In Loew's Monograph of 

 N. A. Dolichopodidte, p. 244, his first section of Psilopus, comprising 

 those with black cilia of the tegulae, are now referred to Psilopodinus, 

 excepting Psilopus diviidiatus ; the other section, with pale cilia, are now 

 referred to Agonosoma, together with Ps. dimidiatus. In Williston's 

 Manual of N. A. Diptera, 1896, pp. 77, 78, substitute Psilopodinus for 

 Psilopus, and Agonosoma for Gnamptopsilopus. 



