I96 NEW YORK STATE MUSEUM 



aa Palpi uni-, bi-, or triarticulate 



b Ovipositor distinctly chitinized, short, the terminal portion cultriform; 



antennal segments 12 to 21 Sackenomyia Felt 



bb Ovipositor fleshy, short or moderately long 



c Palpi triarticulate; terminal clasp segment moderately slender; antennal 



segments 13 to 16 Oligotrophus Latr. 



cc Palpi uni- or biarticulate 



d Ovipositor of the female fleshy, at least moderately long, not enlarged, 

 the terminal lobes rather short and stout, the terminal clasp segment 



of the male short, stout, fusiform Rhopalomyia Rubs. 



dd Ovipositor of female short, triangular, the terminal clasp segment of 

 the male distinctly produced, not fusiform ..Walshomyia Felt 



PHYTOPHAGA Rond. 



1840 Rondani, Camillo. Sopra alcuni nouvi generi di Insetti Ditteri. Mem- 

 oria seconda per servire alia Ditterologia Italiana. Parma, Donati, p. 13 



1843 Sci. Nat. Bologna Ann., 9: 158-59 



1846 Sci. Nat. Bologna Nouv. Ann., ser. 2, p. 371, 374 



1856 Dipt. Ital. Prodr., 1:200 



1 86 1 Soc. Ital. Sci. Nat. Milano Atti, vol. 2, separate, p. 4 



1896 Kieffer, J. J. Misc. Entomol. Jan., 4:4 (Mayetiola) 



1896 Wien. Ent. Zeit., 15: 89 (Mayetiola) 



1897 Syn. Cecid. Eur. & Alg., p. 24 (Mayetiola) 



1897 Marchal, Paul. Soc. Ent. Fr. Ann!, 66: 62-63 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 369 (Mayetiola) 



1910 Rubsaamen, E. H. Zeitschr. Wissenschaft. Insektenbiol., 15: 336 

 1910 — Zeitschr. Wissenschaft. Insektenbiol., 15:204 (Poomyia) 



191 1 Felt, E. P. N. Y. Ent. Soc. Jour., 19: 45 

 19 1 3 Kieffer, J. J. Gen. Insect., fasc. 152, p. 86 



The genus is of particular interest, since it includes the exceedingly 

 injurious wheat pest known as the Hessian fly, P. destructor 

 Say, and treated of in most economic literature under the generic 

 name of Cecidomyia or Mayetiola. The species referable to this 

 genus may be recognized by the third vein uniting with cost a at or 

 beyond the apex, in connection with the quadriarticulate palpi and 

 the simple or feebly dentate claws. We have provisionally allowed 

 this genus to remain in the Oligotrophiariae, a tribe characterized 

 in part by simple claws. 



The genus Phytophaga was erected by Rondani in 1840, in 

 a paper, which according to information kindly supplied by 

 Dr Mario Bezzi of Italy, was published separately. There was no 

 designation of a type spevics until [856, when Rondani cites 



P li v 1 o ]) 1i a g a c e r e a 1 i s Rond., this being a synonym oi 

 P. (I e s t r n c t o r Saw 



