94 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 51 



bristles, of same strength as frontal bristles, and, except for their 

 downward curve, appearing like a continuation of latter to lower 

 eye border. The second aristal joint is long, the third much shorter 

 than in Chcetogccdia, and the whole arista is widened and flattened, 

 usually geniculate or subgeniculate. Eyes bare. 



Phrissopolia desertorum, sp. nov. 



Las Cruces, New Mexico, Cockerell, No. 4,952. Specimens from 

 Beulah, New Mexico (Cockerell), and Santa Clara County, Cali- 

 fornia, may also be referred to this species. 



Length, 9 to 10 mm. The species differs from van der Wulp's 

 description of crcbra as follows: All the tibiae rufous (male) or yel- 

 lowish (female). Face, including parafacials, silvery roseate white 

 in male without yellowish tinge, which is confined to front ; in fe- 

 male with a faint yellowish white tinge spreading over face. Third 

 antennal joint of male four times as long as second, of female three 

 times as long. Arista thickened nearly to end in both sexes, only 

 the apical one-third or one-fourth appearing slender from certain 

 viewpoints due to flattening; second joint very distinct, elongate, 

 fully one-fourth as long as last joint, the articulation geniculate in 

 some cases. Hind tibiae rather weakly ciliate, with a long bristle in 

 middle. Wings faintly yellowish tinged at base. 



Type.— Cat. No. 10,910, U. S. N. M. (Las Cruces, N. Mex.). 



Genus Chaetogaedia Brauer and von Bergenstamm 



Chcetogccdia acroglossoides Townsend. — This is a good species. 

 It is neither a Frontina nor a BanmJiaucria, but is apparently to be 

 referred to Chcetogccdia. Frontina has the parafacials bare, and the 

 second aristal joint is not elongate. Baumhaneria has the front 

 greatly produced, the parafacials hairy and of exaggerated width, 

 much wider than. the eyes, and the cheeks as wide as eye height. 



The identification of this species with Baumh. analis van der Wulp 

 is quite out of the question, if the description agrees with the type. 

 The second antennal joint is elongate, the third is not over four 

 times as long in male and less than three times as long in female as 

 second joint. The description was of the female. 



Chcetogccdia vilis van der Wulp, the type of the genus, has the 

 frontal bristles in two rows, the outer row usually weaker, and the 

 parafacials are clothed only with fine bristly hairs. 



Genus Gaediopsis Brauer and von Bergenstamm 



Gcediopsis cockerclli Coquillett. — This species appears to be cor- 

 rectly referred to the genus Gccdiopsis. The material from which it 



