534 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.37. 



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

 Meigen, 1803, is a change of name. Type, Empis platyptera Panzer. Syn. , Platyptera 

 Meigen, 1803; Macrostomits AViedemann, 1817; Rhamphomyia Meigen, 1822; Eni- 

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



Diostracus Loew, Neue Beitr., vol. 8, p. 43, 1861. 1 species. Type, Diostrucus 

 prasinus Loew. 



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

 Diotrepha vurahilis 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, 

 Xylophagus rujipalpus Wiedemann, the second species, by present designation. Not 

 DipJiysa 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. Tyjie, Mrisca 

 gibha Fabricius. Equals Curtonotum Macquart, 1843. 



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

 Type, Tachina bisignata Meigen, the first species (as bigultata 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, 

 ChJorops versicolor Loew. 



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

 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, Lirnnobia argus Say, the second species, by present designation. 

 Syn., Trodiobola Osten Sacken, 1869. 



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

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

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

 1867. 



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

 Notiphila obscurella Fallen, the first species, by present designation. Syn., Clasiopa 

 Stenhammer, 1844. 



Discomyza Meigen, Syst. Beschr. Zweifl. Ins., vol. 6, ]>. 76, 1830. 1 species. 

 Type, PsUopa incurva Fallen. 



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

 Type, Distichona varia Wulp. Syn., Pseudogermaria Brauer and Bergenstamm, 

 1891; 0;enoc/t;c<a Townsend, 1892. 



Ditomyia Winnertz, Ent. Zeit. Stettin, vol. 7, p. 14, 184(5. ] species. Type, 

 Mycetolna fasciata Meigen (as trifasciata, 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, 

 Dizoiiias phfrniciirus Loew. 



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

 Type, Docosia ralida Winneri'z, the second species, by designation of Johannsen, 

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



