ART. 19 AMERICAN MUSCOID FLIES — ALDRICH 29 



rohu8ta (the Brazilian specimen from Vienna) these are very deeply 

 grooved, the ridges widening a little toward the tip, which is con- 

 cave at apex with a slight projection in the center. I am unable 

 to make out, in the paratypes returned by Curran, the differences he 

 mentions in tlie width of the male abdomen and the tip of the inner 

 forceps, on which he separated 'nica and texensis. 



Represented in the United States National Museum by 14 para- 

 types of texensw. from Oklahoma, Texas, Arizonia, Mexico, and 

 Costa Rica ; 3 paratypes of inca from Peru ; type, allotype, and 12 

 paratypes of mamiwata from Peru; and 9 other Peruvian speci- 

 mens. Several specimens from Dallas, Tex., were reared from 

 Cirphis um'puncta Haworth, the armj' worm. 



The type of rohusta has on the second abdominal segment only a 

 small depressed median marginal on one side, none on the other, 

 while both of the Brazilian specimens which I have considered the 

 same have a normal large pair. On examining the paratj^pes of 

 texensis^ I find one female which has this pair small and depressed, 

 while another has one bristle small and depressed, the other repre- 

 sented by a scar. This character is evidently subject to a slight de- 

 gree of variation and I do not think raises a serious question. Mr. 

 Curran, who revised the genus PeJetena a few years ago, has seen 

 this Brazilian material and the type, and agrees with me that 

 texensis is the same. 



130. DIAPHANOMYIA DIAPHANA Brauer and Bergenstamm 



Paragymnomma diaphana Bkauek and Bergenstamm, Zweifl. Kais. Miis., pt. 

 5, 1891, p. 384. 



Three males and one female, labeled as types; one of the males is 

 from Venezuela (Lindig. 1864), the rest of the series are from 

 Ypanema, Brazil (Natterer). The only locality mentioned by 

 Brauer and Bergenstamm is Brazil, hence the Venezuelan specimen 

 can not be considered a type, although it is the same species. 



The genotype of ParagyuDiomma is hystrix Brauer and Bergen- 

 stamm (syn. Gahardinym hystricosa Townsend), which belongs to 

 the genus Trichophora Macquart. It differs considerably from d/ia- 

 phana in having the abdomen densely bristly. Townsend has pro- 

 jiosed Diaphanomym aurea new genus and species ^° for a species 

 almost exactly like diaphana, yet differing in several slight characters. 

 His tabulation of the differences between his murea and diaphuna 

 Brauer and Bergenstamm is mostly illusory, as shown by the types, 

 which are nearer to aurea than he supposed. He was endeavoring to 

 interpret the description of diaphana without specimens. All the dif- 

 ferences I can make out are the following: The front in aurea is 



'"Bull. Amer. Mus. Nat. Hist., vol. 37, 1917. p. 229. 



