4 PROCEEDIXGS OF THE NATIONAL MUSEUM vol. 93 



1. Genus ZENILLIA Robineau-Desvoidy 



Zenillia Robineau-Desvoidy, Mem. Acad. Sci. Inst. Prance, vol. 2, p. 152, 1830; 

 Histoire naturelle des dipteres des environs de Paris, vol. 1, p. 471, 1863. — 

 Bezzi and Stein. Katalog der palaearktischen Dipteren, vol. 3, p. 277, 1907. 

 —Coquillett, Proc. U. S. Nat. Mus., vol. 37. p. 021. 1010.— Baer, Zeitschr. 

 Angew. Ent., vol. 7. p. US, 1921. — Aldricii and Webbeb (partim), Proc. U. S. 

 Nat. Miis., vol. 63, art. 17, p. 7, 1024. — Lundreck, Diptera Danica, pi. 7, p 

 337, 1027. — Townsend, Manual of myiology, pt. 4, p. 231, 1936. (Genotype, 

 Musca libatrix Panzer. By designation of Robineau-Desvoidy, 1863.) 



Myxerorista Prater and Bebgenstamm, Denkscbr. Akad. Wiss. Wien, math.- 

 nat. Kb, vol. 58, p. 331, 1891 ; Verb, zool.-bot. Ges. Wien, vol. 43, p. 470, 1893. 

 — Townsend, Manual of myiology. pt. 4, p. 278, 1936. (Genotype, Musca 

 libatrix Panzer. By designation of Brauer and Bergenstamm. ) 



Hi/phantrophaga Townsend, Pscybe, vol. 6, p. 247, 1892; Manual of myiology, 

 pt. 4, p. 249, 1936— Coquillett, U. S. Dept. Agr., Div. Ent., Tech. Bull. 7, 

 p. 91, 1897. (Genotype, Meigenia hyphantriae Townsend. By original desig- 

 nation.) (New synonymy.) 



Exorista of authors (nee. Meigen). — Coquillett, (partim), U. S. Dept. Agr., 

 Div. Ent., Tech. Bull. 7, p. 91, 1897.— Stein (partim), Arch. Naturg., Abt. A, 

 Heft. 6, p. 67, 1924. — Baranoff (partim), Institut Hygiene und Scbule 

 Volksgesundbeit, Zagreb, Arb. parasit. Abt., No. 3, 1931. 



Eusisyropa Townsend, Smithsonian Misc. Coll., vol. 51, No. 2, p. 97, 1908; 

 Manual of myiology, pt. 4, p. 245, 1936. (Genotype, Exorista blanda Osten 

 Sacken. By original designation.) 



Eucxorista Townsend, Proc. Ent. Soc. Washington, vol. 14, p. 166, 1912; Manual 

 of myiology, pt. 4, p. 249, 1936. (Genotype, Exorista futilis Osten Sacken. 

 By original designation.) 



Chrysomasiccra Townsend, Journ. N. Y. Ent. Soc, vol. 23, p. 230, 1915 ; Manual 

 of myiology, pt. 4, p. 112, 1936. (Genotype, C. borealis Townsend. By orig- 

 inal designation.) 



Chrysoexorista Townsend, Proc. U. S. Nat. Mus., vol. 49, p. 435, 1915; Manual 

 of myiology, pt. 4, p. 94, 1936. (Genotype, C. viridis Townsend. By original 

 designation.) 



There exists a difference of opinion concerning the generic limits 

 of Zenillia. Stein and Baranoff consider Zenillia to be a synonym of 

 Exorista of authors. Baer and Lundbeck separate Zenillia from 

 Exorista of authors, but they are not sure of the limits of these two 

 genera. The only apparent difference between Baer and Lundbeck's 

 Zenillia and Exorista is that in Zenillia the facial ridges are usually 

 considered to have regularly arranged bristles of somewhat equal 

 length above the vibrissae that ascend to near or fully to the middle, 

 whereas in Exorista the facial ridges have only a few rapidly de- 

 creasing bristles above the vibrissae. The separation of these two 

 genera on the presence or absence of bristles on the facial ridges can- 

 not be attempted with any degree of assurance. The writer is of the 

 opinion that the character is of specific rather than of generic value. 

 As defined in this paper, the majority of the species that Baer and 

 Lundbeck place in Zenillia of authors can be referred to Zenillia 

 Robineau-Desvoidy, and the majority of species they place in Exorista 



