TAXONOMY OF MUSCOIDEAN FLIES — TOWNSEND I05 



Bclvosia and Latreillimyia show no ventral plates or ventral mem- 

 brane. 



LATREILLIMYIA, nom. gen. nov. 



This name/is proposed for Latreillia Robineau-Desvoidy (1830), 

 which is preoccupied by Roux in Crustacea ( 1827) . 



GONIOMIMA, gen. nov. 



This genus is proposed for Bclvosia lutcola Coquillett. Bears a 

 striking resemblance to Gonia. Second antennal joint short, third 

 joint very long and narrow; arista long and flattened whole length, 

 in front view appearing as a mere line, but in lateral view showing 

 itself to be uniformly widened nearly to apex ; frontal bristles in one 

 main inner row bordering frontalia, with a row of weaker bristles 

 outside, and orbital bristles (female) outside these; second aristal 

 joint very short, front not widened and swollen, facialia ciliate 

 almost to base of antennae. Abdomen appearing conical from above, 

 but laterally appressed on apical portion, fully as thick dorso- 

 ventrally for its whole length as its greatest width, which is at base. 

 The body and wing characters agree perfectly with Gonia, but the 

 head characters are totally different, and it is the latter which place 

 the genus in the Willistoniinse. 



The genus appears to come near Thelymorpha Brauer and von 

 Bergenstamm, but is at once distinguished by having no discal 

 macrochsetse on abdomen. The head is almost the same, and the 

 abdomen is described as very similar. 



TRIACHORA, gen. nov. 



This genus is proposed for Latreillia unifasciata Robineau-Des- 

 voidy, of which Exorista flavicauda Riley is a synonym. Differs 

 from Latreillimyia in having three rows of frontal bristles on each 

 side of frontalia. besides the fronto-orbital bristles of female. The 

 arista is flattened, and the antennal characters are similar to those of 

 Goniomima. The main or strongest row of frontal bristles, of the 

 three rows on each side, is in the middle, the inner row being de- 

 cidedly weaker, and the outer row but little weaker than the main or 

 middle row. 



Genus Rileymyia Townsend 



(Ent. News, 1893. p. 277) 



This name was proposed by the writer in 1893 for Rileya Brauer 

 and von Bergenstamm, which is preoccupied in Hymenoptera. The 

 type of the genus is Blepliaripeza fulvipes Bigot, according to Brauer 



