552 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.37. 



Heterostylum Macquart, Dipt. Exot., Suppl. 3, p. 35, 1848. 1 species. Type, 

 Heterostylum flmmm Macquart. Syn., Comastes Osten Sacken, 1877. 



Ilexncmdha Meigen, Illiger's Mag., vol. 2, p. 264, 1803. 2 species. Type, Musca 

 chalj/beata For.ster (as Stratiomys sexdentata Fabricius), the second species, by 

 tautoiiomy. Equals Beris Latreili.e, 1802. 



Hexachaeta Loew, IMonogr. Dipt. N. Amer., vol. 3, p. 219, 1873. 3 species. Type, 

 Tryjietd f.r/y/;/rt Wiedemann, the first species, by present designation. 



Hexamitocera Beckf;r, Berliner Ent. Zeitschr., vol. 39, p. 107, 1894. 1 species. 

 Type, Cordlhira loxocerata Fallen. 



Hexatoma Latreille, Gen. Crust, et Ins., vol. 4, p. 260, 1809. 1 species. Type, 

 Hexatoma nigra Latreille. Syn., Nematocera Meigen, 1818; .^nisomera Wiedemann, 

 1818. 



Hiatus Cresson, Trans. Anier. Ent. Soc, vol. 32, p. 280, 1906. 1 species. Type, 

 Hiatus fulripes Cresson. 



Hilara Meigen, Syst. Beschr. Zweifl. Ins., vol. 3, p. 1, 1822. 21 species. Type, 

 Empis rnaura Fabricius, the second species, by designation of Curtis, Brit. Ent., 

 1826, p. 130. 



Hilarella Rondani, Dipt. Ital. Prodr., vol. l,p. 70, 1856. 1 specues. Type, Milto- 

 gratnnia liilarella Zetterstedt. Syn., Eumacronycha Tovvnsend, 1892; (lymnopwsopa 

 TOWNSEND, 1892. 



Hilarimorpha Schiner, Wien. Ent. Monatschr., vol. 4, p. 54, 1860. 1 species. 

 Type, Hilarimorpha, singularis Schiner. 



Himantostoma Loew, Berliner Ent. Zeitschr., vol. 7, p. 321, 1863. 1 sj)ecies. Type, 

 Hiynantostoma. sugens Loew. Not HimanUMoiiia Agassiz, 1862. 



i/^('mer« Desvoidy, Hist. Nat. Dipt., vol. 1, p. 1124, 1863. 1 species (as 4). Type, 

 Guerinia festica Desvoidy. Equals Exorista IMeh^en, JS03. 



Himercessa Loew, Monogr. Dipt. N. Amer., vol. 3, p. 85, 1873. 1 si^ecies. Type, 

 Iliinenessa 2)re!iosa Loew. 



Hippelates Loew, Berliner Ent. Zeitschr., vol. 7, p. 36, 1863. 2 species. Type, 

 IUppelateii ]>lebejii.H Loew, the second species, by present designation. Syn., tSiphomyia 

 Williston, 1896. 



Hippobosca Linn.eus, Syst. Nat., 10th ed.,p. 607, 1758. 4 species. Type, Ilippu- 

 hosea equina Linn.eus, the first species, by designation of Latreille, Consider. 

 General., ISIO, p. 444. Syn., Nirmomyia Nrrzscn, 1818. 



Hirmoneura Meigen, Syst. Beschr. Zweifl. Ins., vol. 2, p. 132, 1820. 1 S[)ecies. Type, 

 Hirmonenra o/>.s«tra Wiedemann. Syn., Para.'iy mm ictus Bkjot, 1879. 



Histiodroma Schiner, Verb. Zool.-Bot. Ges. Wien, vol. 17, p. 308, 1867. 1 species. 

 Type, Sargus inermis Wiedemann. 



Holcocephala J.ennicke, Neue Exot. Dipt., p. 51, 1867. Change of name for Disco- 

 cephald Macquart, 1838, not of Laporte, 1832. Type, Dasypogon nbdominalis Say. 

 Syn., Disrocephala Maccjuart, 1838, preoccupied. 



Holmhergia Arribalzaga, An. Soc. Cient. Argentina, vol. 32, p. 196, Oct., 1891. 

 1 species. Type, Holmhergia guntJierii Arribalzaga. Equals Rhopalosyrphus 

 GiGLio-Tos, Sept. 20, 1891, 



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

 RhampJiomyia umbripennis Meigen {as pulchra, new species). Equals Dionnaea Mei- 

 gen, 1800. 



Holoneura Kieffer, Ann. Soc. Ent. France for 1894, p. 312, 1894. 1 species. Type, 

 Holoneura cincta Kieffer. 



Holopogon Loew, Linn. Ent., vol. 2, p. 473, 1847. 7 species. Type, Dasypogmi 

 nigripennis Meigen, the third species, by present designation. 



Holorusia Loew, Berliner Ent. Zeitschr., vol. 7, p. 277, 1863. 1 species. Type, 

 Holorusia grandis Bergroth (as rubiginosa, new species, jireoccupied ) . 



