NO. 1719. TYPE-SPECIES OF AMERICAN DIPTERA—COQUILLETT. 579 



Zeitschr., vol. 39, 1894, p. 141, selected the second species as type of a new genus, 

 Bostrichopyga. Not Okenia Leuckart, 1826. Equals Okeniella Hendel, 1907. 



Okeniella Hendel, Wien. Ent. Zeit., vol. 26, p. 98, 1907. Change of name for 

 Okenia Zetterstedt, 1838, not of Leuckart, 1826. Type, Cordilura caudala Zetter- 

 STEDT. Syn., Okenia Zetterstedt, 1838, preoccupied. 



Olbiogaster Osten Sackex, Biol. Centr.-Amer., Dipt., vol. 1, p. 20, 1886. 2 species. 

 Type, Rlii/phus timiatus Bellardi, the second species, by present designation. 



Olenochaeta Townsend, Trans. Amer. Ent. Soc, vol. 19, p. 114, 1892. 1 species. 

 Type, Distichona varia Wulp (as kansensis, new species). Equals Distichona 

 WuLP, 1890. 



Olfersia Wiedemann, Auss. Zweifi. Ins., vol. 2, p. 605, 1830. Change of name for 

 Feronia Leach, 1817, not of Latreille, 1817. Type, Feronia s^pinifera Leach. 8yn., 

 Feronia Leach, 1817, preoccupied. 



Oligarces Meinert, Nat. Tidsskr. for 1865, p. 237, 1865.* 1 species. Type, Oli- 

 garces paradoxxis Meinert. 



Oligochastus Mik, Jahresb. k. k. Akad. Gymnas., p. 7, 1878. 5 species. Type, 

 Medetera plumbella Meigen, the first species, by original designation. Equals Mede- 

 tera Fischer, 1819. 



Oligomera Doleschall, Nat. Tijdschr. Ned. Indie, vol. 14, p. 387, 1857. 1 species. 

 Type, Limnobia acrostacia Wiedemann (as jarensis, new species). Equals Caloptera 

 GuERiN, 1829. 



Oligotrophus Latreille, Hist. Nat. Crust, et Ins. , vol. 14, p. 288, 1805. 1 species. 

 Type, Tipida jnniperina Linn.eus (as "Tipule des galles du genevrier" of De Geer). 



Olina Desvoidy, Essai Myod., p. 812, 1830. 5 species. Type, OUna hirtipes Des- 

 voiDv, the third species, by present designation. 



Olivieria Meigen, Syst. Beschr. Zweifi. Ins., vol. 7, p. 266, 1838. 1 species. Type, 

 Tachina longirostris Meigen. Equals Aphria Desvoidy, 1830. 



Omalocephala Macquart, Dipt. Exot., vol. 2, pt. 3, p. 231, 1843. 1 species. Type, 

 Omalocpphala fusca Macquart. Not Omalocephala Spinola, 1839. Equals Tylemyia 

 GiGLio-Tos, 1893. 



Omegasyrphus Giglio-Tos, Boll. Mus. Zool. Univ. Torino, vol. 6, no. lOS, ]>. 4, 

 1891. No species. In 1892, 1 species. Type, Microdon coarctatus Loew. 



Ommatius Wiedemann, Dipt. Exot., p. 213, 1821. 3 species. Type, Asitns mar- 

 gineUns Fabricius, the first species, by present designation. 



Omomyia CoQUiLLETT, Can. Ent., vol. 39, p. 76, 1907. 1 species. Type, Omomyia 

 himula CcniUiLLETT. 



Omphrale Meigen, Nouv. Class. Mouch., p. 29, 1800.* No species. Hypselura 

 Meigen, 1803, is a change of name. Type, Musca fenestralis Linn^us. Syn., Sceno- 

 pinus Latreille, 1802; Hypselura Meigen, 1803; Atrichia Schbank, 1803; Cona 

 Schellenberg. 1803; Astoma LioY, 1864. 



Onesia Desvoidy, Essai Myod., p. 365, 1830. 2 species (as 16). Type, Musca 

 sepulchralis Meigen, (equalling 15 of the supposed species), by designation of Ron- 

 dani, Dipt. Ital. Prodr., vol. 1, 1856, p. 90 (as vespillo FABRicirs). Syn., Melinda 

 Desvoidy, 1830; Bellardia Bf.syoidy, 1863; Mar a rign a l,io\, 1864. 



Onodontha Rondani, Dipt. Ital. Prodr., vol. 1, p. 94, 1856. 1 species. Type, Ono- 

 dontha penicillata Rondani (as Hydrotsea floccosa Macquart). Equals Hydrotaea 

 Desvoidy, 1830. 



Onychogonia Brauer and Bergenstamm, Denkschr. Kais. Akad. Wiss. Wien, vol. 

 56, p. 100, 1889. 1 species. Type, Gonia fiadceps Zetterstedt. Equals Salmacia 

 Meigen, 1800. 



Ophelia Desvoidy, Essai Myod., p. 120, 1830. 2 species (as 5). Type, Tachiita 

 campestris Fallen (equaling the last 3 supposed species), by present designation. 

 Equals Metopia Meigen, 1803, 



