534 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 37. 



Dionnaea Meigen, Nouv. Class. Mouch., p. 24, 1800.* No species. Platyptera 

 Mekjen, 1803, is a change of name. Type, Einpis platyptera Panzer. Syn. , Platyptera 

 Meigen, 1803; Macrostomus Wiedemann, 1817; Phamphomyia Meigen, 1822; Eni- 

 copteryx Stephens, 1829; Iloloclera Schiner, 1860; Megacyttarus Bigot, 1880. 



Diostracus LoEW, Neue Beitr., vol. 8, p. 43, 1861. 1 species. Type, Diostrunis 

 prasinus Loew. 



Diotrepha Osten Sacken, Cat. Dipt. N. Amer., p. 219, 1878. 1 species. Type, 

 Diotrej)ha mirabilis Osten Sacken. 



Dipalta Osten Sacken, Bull. 3, U. S. Geol. Surv., p. 236, 1877. 1 species. Type, 

 Dipalta serpentina Osten Sacken. 



Diphysa Macquart, Dipt. Exot., vol. 1, pt. 1, p. 172, 1838. 2 species. Type, 

 XylopJiagus rnfipalpus Wiedemann, the second species, by present designation. Not 

 Diphysa Blainville, 1834. Equals Exaireta Schiner, 1867. 



Diplocentra Loew, Zeitschr. Ent. Breslau, vol. 13, p. 13, 1859. Change of name for 

 Curtonotum Macquart, 1843, on account of alleged preoccupation. Type, Musca 

 gibba Fabricius. Equals Curtonotum Macquart, 1843. 



Diplomera Lioy, Atti Inst. Veneto, ser. 3, vol. 9, p. 1349, 1864. 2 species (as 3). 

 Type, Tac/i/na fc/sijrrirtto Meigen, the first species (as biguttata Meigen), by present 

 designation. Equals Meigenia Desvoidy, 1830. 



Diplosis Loew, Dipt. Beitr., vol. 4, p. 20, 1851. 15 species. Type, Tipula pini De 

 Geer, the ninth species, by designation of Rondani, Atti Soc. Ital. Sci. Nat., vol. 2, 

 1861, p. 289. Equals Itonida Meigen, 1800. 



Diplotoxa Loew, Berliner Ent. Zeitschr., vol. 7, p. 54, 1863. 1 species. Type, 

 Chlorops versicolor Loew. 



Dipsa Fallen, Spec. Ent. Meth. Exh., p. 20, 1810. 1 species. Type, Lonchop- 

 tera lutea Panzer (as bifurcata, new species). Equals Lonchoptera Meigen, 1803. 



Dirhiza Loew, Dipt. Beitr., vol. 4, p. 21, 1850. 1 species. Type, DIrhiza lateritia 

 Leow. 



Discobola Osten Sacken, Proc. Acad. Nat. Sci. Phila. for 1861, p. 226, 1862. 2 

 species. Type, Limnobia argus Say, the second species, by present designation. 

 Syn., Trochobola Osten Sacken, 1869. 



Discocephala Macquart, Dipt. Exot., vol. 1, pt. 2, p. 50, 1838. 3 species. Type, 

 Dasypogon abdominalis Say (as rufiventris, new species), the third species, by present 

 designation. Not Discocephala Laporte, 1832. Equals Holcocephala J^nnicke, 

 1867. 



Discocerina Macquart, Hist. Nat., Dipt., vol. 2, p. 527, 1835. 4 species. Type, 

 Notipldla obscurella Fallen, the first sjiecies, by present designation. Syn., Clasiopa 

 Stenhammer, 1844. 



Discomyza Meigen, Syst. Beschr. Zweifi. Ins., vol. 6, p. 76, 1830. 1 species. 

 Type, P^ilopa incurva Fallen. 



Distichona Wulp, Biol. Centr.-Amer., Dipt, vol. 2, p. 44, 1890. 1 species. 

 Type, Distichona varia Wulp. Syn., Pseudogermnria Brauer and Bergen.stamm, 

 1891; 0/enoc/i ,rta TowNSEND, 1892. 



Ditomyia Winnertz, Ent. Zeit. Stettin, vol. 7, p. 14, 1846. 1 species. Type, 

 Myertobia fnsciata Meigen (as trifascintn, new species). 



Dixa Meigen, Syst. Beschr. Zweifl. Ins., vol. 1, p. 316, 1818. 3 species (as 4). 

 Type, Dixa maculata Meigen, the third (valid) species, by designation of Curtis, 

 Brit. Ent., 1832, p. 409. 



Dizonias Loew, Berliner Ent. Zeitschr., vol. 10, p. 30, 1866. 1 species. Type, 

 Dizonias phamicurus Loew. 



Docosia Winnertz, Verb. Zool.-Bot. Ges. Wien, vol, 13, p. 802, 1863. 2 species. 

 Type, Docosia valida Winnertz, the second species, by designation of Johannsen, 

 Gen. Ins., Dipt., Mycet., 1909, p. 92. 



