580 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. ?>7. 



Opiiromyia Williston, Biol. Centr.-Amer., Dipt., vol. 3, p. 55, Dec, 1891. 1 spe- 

 cies. Tj'pe, Ophromyia nasica Williston. Equals Megametopon Giglio-Tos, Sep- 

 tember, 1891. 



Ophthalmoniyin Williston, Trans. Ent. Soc. Lond. for 1896, p. 426, 1896. 1 species. 

 Type, Lohioptera lacteipennis Loew. Equals Milichiella Giglio-Tos, 1895. 



Ophyra Desvoidy, Essai M3'od., p. 516, 1830. 3 species (as 4). Type, Anthomyia 

 leucodoma Wiedemann (equaling the first 2 supposed species), by designation of 

 Westwood, Intr., vol. 2, Synops., 1840, p. 142. 



Oplachantha Rondani, Arch. Zool., vol. 3, p. 87, 1864. 2 species. Type, Beris 

 mexicana Bellardi, the first species, by original designation. Equals Beris Latreille, 

 1802. 



Oplogaster Rondani, Dipt. Ital. Prodr., vol. 1, p. 98, 1856. 1 species. Type, 

 Musca inolUcula Fallen. 



Opomyza Fallen, Oponi. Svecite, p. 10, 1820. 3 species. Type, Musca germmationis 

 Linn.eus, the first species, by designation of Westwood, Intr., vol. 2, Synops., 1840, 

 p. 152. 



Oppia Desvoidy, Hist. Nat. Dipt., vol. 2, p. 404, 1863. 1 species. Type, Taehina 

 devia Fallen (as ciUgera, new species). Equals Brachicoma Rondani, 1856. 



Opsebius Costa, Rend. Soc. Borb. Accad. Sci., new ser., vol. 5, p. 20, 1856. 

 1 species. Type, Opsebius perspicillatus Cost a. Syn., Fithogaster L,oew, 1857. 



Opsidia Coquillett, Journ. N. Y. Ent. Soc, vol. 3, p. 102, 1895. 1 species. Tyi)e, 

 Oj)sidia gonioides Coquillett. 



Opsiomyia Couuillett, Jouru. N. Y. P^nt. Soc, vol. 6, p. 162, 1898. 1 species. 

 Type, Opsiomyia palpalis Couuillett. 



Opsolasia, new genus. Type, Lasiops calvicrura Coquillett. (This is Lasiops 

 of authors, not of Meigen. ) 



Orbellia Desvoidy, Essai Myod., p. 656, 1830. 2 species. Type, Orbellia vnjopi- 

 formis Desvoidy, the first species, by present designation. Equals Heleomyza Fal- 

 len, 1810. 



Orellia Desvoidy, Essai Myod., p. 765, 1830. 1 species. Type, Trypeta wiedemanni 

 Meigen (as flamcans, new species). Syn., Goniglossum Rondani, 1856; (Edaspis 

 Loew, 1862. 



Oreogeton Schiner, Wien. Ent. Monatschr., vol. 4, p. 53, 1860. 1 species. 

 Type, (iJoma basalis Loew. 



Oreomyza Pokorny, Wien. Ent. Zeit., vol. 6, p. 50, 1887. 3 species. Type, Oreo- 

 myza glacialis Pokorny, the first species, by present designation. Equals Tipula 



LiNN.FAIS, 1758. 



Oreothalia Melander, Trans. Amer. Ent. Soc, vol. 28, p. 232, 1902. 1 species. 

 Type, Oreothalia pelops Melander. 



Orillia Desvoidy, Ann. Soc. Ent. France for 1848, p. 474, 1848. 2 species (as 3). 

 Type, Orillia rec^inerm Desvoidy, the second species, by present designation. Equals 

 Leskia Desvoidy, 1830. 



Orimarga Osten Sacken, Monogr. Dipt. N. Amer., vol. 4, p. 120, 1869. 1 species. 

 Type, Limnobia alpina Zetterstedt. Syn., Ninguis Wallengren, 1881. 



Orimargiila Mik, Wien. Ent. Zeit., vol. 2, p. 198, 1883. 2 species. Type, Ori- 

 margrUa alpigena Mik, the first species, by original designation. Equals Antocha 

 Osten Sacken, 1860. 



Orizia Desvoidy, Hist. Nat. Dipt., vol. 2, p. 678, 1863. 2 species (as 6). Type, 

 Musca rudis Fabricius (equaling the first 5 supposed species), by present designation. 

 Equals PoUenia Desvoidy, 1830. 



Ormia Desvoidy, Essai Myod., p. 428, 1830. 1 species. Type, Ormia punctata 

 Desvoidy. Syn., (^Ts'sfrqpTiasia Brauer and Bergenstamm, 1889; Phasiopteryx Braver 

 and Bergenstamm, 1889; Cfenosowa Wulp, 1890; Neoptera Wulp, 1890; Euwstrophasia 

 Townsend, 1892. 



