CATALOGUE OF NORTH AMERICAN DIPTERA. 495 



soror WiLLiSTON, Trans. Amer. Ent. Soc, xiii, 298 (Hystricia). — Ariz. 



Van der Wulp, Biologia, Dipt., 11, 15, pi. i, f. 9, pt. desc. (id.). — Guate- 

 mala, Costa Rica. 

 GiGLio-Tos, Ditt. del ]\Iess., in, 28 (id.), note. — Mex. 

 CoouiLLETT, Revis. Tachin., 147. — Col. 



MICROCHIRA. 



Brauer and Bergenstamm, Zweifl. d. Kaiserl. Mus., vi, 188, 1893. 

 mexicana Brauer and Bergenstamm. Zweifl. d. Kaiserl. Mus., vi, 188. — Mex. 



TROPIDOPSIS. 



Brauer and Bergenstamm, Zweifl. d. Kaiserl. Mus.. iv, 132, 1889; vi, 147, 



1893. 

 pyrrhaspis Wiedemann, Auss. Zw., ii, 307 (Tachiiia). — Brazil. 

 Walker, List, iv, 73;^ {Tachina anthemoii). — Brazil. 

 ScHiNER, Novara, 332 (Hystricia), notes. — S. A. 

 Van der Wulp, Biologia, Dipt., 11, 18, pt. desc. (Hystricia) . — Cordova, 



Mex. ; Guatemala. 

 GiGLio-Tos, Ditt. del Mess., iii, 28, notes. — Tuxpango and Orizaba, Mex. 

 Van DER Wulp, Biologia, Dipt., 11. 461 (Hystricia), oc. — Vera Cruz and 



Jalapa, Mex. 



DEXIID^. 



Bigot, Revue d'EntomoL, 1885, 266, table of all genera. 

 Van der Wulp, Biologia, Dipt., 11, 211, table of Mexican genera, 1891. 

 Brauer and Bergenstamm, Zweifl. d. Kaiserl. Mus., v, 1891. 

 TowNSEND, Trans. Amer. Ent. Soc, xix, 1892, 273. table of N. A. genera. 

 Van DER Wulp, Tijdschr. v. Ent., xxviii, 189, 1885, has a table of the long- 

 legged genera, referring especially to those of Tropical America. 



Xotc. — Brauer and Bergenstamm published an extensive work in the same 

 year as Van der Wulp, 1891. I am unable to settle the question of actual pri- 

 ority; but as Van der Wulp allowed Brauer and Bergenstamm to use his types 

 as a matter of courtesy, and they attributed his genera to him, it would seem 

 unwise to disturb this arrangement. 



The ideas of the authors named above differ widely as to the limits and 

 validity of genera; frequently they are hopelessly contradictory. The work of 

 Brauer and Bergenstamm is obviously of a preliminary character, undergoing 

 material change with each succeeding instalment, wdiich makes it undesirable 

 to follow it for sequence of genera. 



The differences between Tachinidse and Dexiidte are evanescent, and the pros- 

 pect is that the families will ultimately be combined, or new family characters 

 established. In the present work, most of the doubtful genera, if not in fact 

 all of them, will be found in the Tachinidse. 



The following notes may be grouped together, for convenience of reference : 



Illigera selops Walker is a Beskia. 



Illigeria corythus Walker is Xanthomclana atripciiiiis. 



Illigeria helymus Walker is a Mctachccta. 



Megerlea rufocaudata Bigot goes in Sarcophilodcs. 



Oplisa albifacies Bigot is a Pscudodexia. 



Oplisa nigrifacies Bigot ; according to Brauer, Sitzungsbericht d. K. Akad., 

 cvi, 32, the types include four species, referable to three genera. 



Phorostoma appendiculata Bigot is a Myiomima. 



