18 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.83 



Lachnomma Townsend, Trans. Amer. Ent. Soc, vol. 19, p. 103, 1892. [Geno- 

 type, L. magnicornis, new species (male only) ^Atrophojjoda singularis 

 Townsend. I have examined the type specimen.] 



Microchira Br.\ueb and Bekgenstamm, Die Zweifliigler des kaiserlichen Mus- 

 eums zu Wien, no. 6, p. 188, 1893. [Genotype, M. mexicana, new species 

 (male only) —Paradidjjma apcrta Brauer and Bergenstaram, loc. cit., p, 

 187.] 



Lachnommopsis Townsend, Proc. U.S. Nat. Mus., vol. 49, p. 421, 1915. [Geno- 

 type, L. armata, new species (male only).] 



Phytoadmontia Townsend, Proc. U.S. Nat. Mus., vol. 49, p. 626. 1916. (Geno- 

 type, Admontia sctigera Coquillett.) 



Ill arranging the foregoing synonymy, I have examined all the 

 type species involved. Atrophopoda hraiceri Williston, listed as a 

 synonym of Paradidyma by Aldrich ^ and Coquillett,^ does not come 

 within the limits of the genus as restricted herein. I have examined 

 a male type specimen in the Kansas University Museum. It has 

 the eyes practically bare, and the first vein of the wing is setulose 

 on almost the entire length. For this species Townsend ^ estab- 

 lished Diaphoropeza^ which Coquillett ^ also placed in synonymy 

 with Paradidyvia. Under the rules of the International Code the 

 genus is valid, although no description of the generic characters was 

 given. 



Generic characters (from the type species). — Eyes distinctly hairy. 

 Front in male narrowed behind and rather prominent at base of 

 antennae. Face receding, moderately excavated, its ridges normally 

 divergent downward, in profile concave above mouth with the front 

 edge of latter slightly prominent between vibrissae. Antennae in- 

 serted about on level with middle of eye, extending almost to oral 

 margin, basal segments subequal in length in male. Second seg- 

 ment of arista short. Parafacial with a row of macrochaetae on the 

 inner margin extending from lowermost frontal almost to lower 

 edge of eye. Vibrissae situated on level with oral margin. Facial 

 ridges bearing a few bristles and hairs above the vibrissae. Pro- 

 boscis shorter than height of head, distal segment moderately slender, 

 labella fleshy. Palpi normal in size, slender, tips hardly thickened. 

 Frontal rows moderately divergent beneath base of antennae, extend- 

 ing to base of third segment. Ocellars present, proclinate. Orbitals 

 absent in male. Cheek about one-half the eye height. Back of 

 head densely pale haired, with a row of black hairs below the orbital 

 fringe. 



Thoracic chaetotaxy: Acrostichal, 2, 1 (postsutural pair well de- 

 veloped, situated in transverse line with posterior dorsocentral pair) ; 



* A catalogue of North American Diptera. Smithsonian Misc. Coll., vol. 46, p. 474, 

 1905. 



2 The type-species of the North American genera of Diptera. Proc. U.S. Nat. Mus., 

 vol. 37, p. 532, 1910. 



8 Smithsonian Misc. Coll., vol. 51, no. 2, p. 64, 1908. 



