10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.83 



ent study, I have seen but one specimen {P. singularis) in which the 

 first vein is not entirely bare; this specimen has only one or two 

 hairs present on the vein. When the persistently bare first vein is 

 considered throughout the group, the character seems to be of 

 generic importance, and I have included in the present genera only 

 those forms that agree in this respect. 



Genus CERATOMYIELLA Townsend 



Ceratotnyiella Townsend, Ti*ans. Amer. Ent. Soc, vol. 18, p. 379, 1891. (Geno- 

 type, C conlca, new species.) — Brauek and Bekgenstamm, Die Zweifliigler 

 des Ivaiserliclien Museums zu Wien, no. 6, p. 189, 1S93. — Aldrich, Catalogue 

 of Nortlj American Diptera, p. 427, 1905. 



AtropJiopalpus Townsend, Ent. News, vol. 3, p. 130, 1892. (Genotype, A. 

 august icornis, new species.) — Coquillett, Revision of the Tachinidae of 

 America, p. 12C, 1897. — Aldrich, Catalogue of North American Diptera, 

 p. 475, 1905. 



Oedemapcza Townsend, Smithsonian Misc. Coll., vol. 51, p. 65, 1908. (Genotype. 

 Atrophopoda townsc^idi Williston.) 



All of the type species concerned have been examined in arranging 

 the above synonymy. The principal character, listed among others 

 in the description of Atropho palpus^ is the reduced size of the palpi ; 

 although somewhat smaller than in the genotype of Geratomyiella^ 

 they are nevertheless distinctly developed, and the relative difference 

 in size can hardly be considered of more than specific importance. 

 Oedemapeza was established by the mere citation of a species as the 

 type. The genus G eratomyiella is closely related to Paradidymal 

 from which it differs most obviously in having the eyes bare. 



Generic characters (from the type species). — Eyes bare. Front 

 not prominent at antennae, where the length of head distinctly 

 exceeds the vibrissal axis. Antennae nearl}^ as long as face, inserted 

 above middle of eyes, basal segments short. Arista with short basal 

 segments. Face receding, the depression broad and deep. Facial 

 ridges practically bare, weakly divergent below. Parafacial with a 

 row of bristles on the inner margin extending from the lowermost 

 frontals to level with lower edge of eye. Vibrissae situated on the 

 front edge of mouth. Proboscis short, labella fleshy. Palpi rather 

 short and slender. Cheek one-third to two-fifths the eye height. 

 Male with one pair, female with two pairs, of proclinate orbital 

 bristles. Frontals extending below middle of second antennal seg- 

 ment, uppermost larger, reclinate. Ocellars present, proclinate. 

 Inner verticals developed, outer pair moderately developed in female, 

 vestigial in male. 



Thoracic chaetotaxy: Acrostichal, 2, 1 (postsutural pair hairlike, 

 situated in transverse line with hindmost dorsocentrals) ; humeral, 2; 



