FLIES OF THE GENUS OGCODES — SCHLINGER 297 



Discussion: The question of the relationship of rufoabdominalis to 

 dusmeti Arias from Mexico was discussed by Sabrosky (1948, p. 419) 

 and resulted in the questionable synonymy of the latter species. A 

 thorough study of the original description of dusmeti does not reveal 

 any significant differences between the two. However, since there are 

 no available intervening records (Mexico to Utah), I feel it best to 

 retain dusmeti as a distinct species with the hope that the type or 

 topotypical material can be studied in the future to clarify its status. 



Both Cole (1919) and Sabrosky (1948) noted the similarity of 

 rufoabdominalis to varius Latreille from Europe. An examination of 

 a small series of the latter species from Germany and Hungary (4cf , 

 29) showed the following distinctive features: 



O. nifoabdominalis: Male genitalia with aedeagus more rounded apically (com- 

 pare pi. 7, fig. 34 and pi. 8, fig. 47); humerus, postalar callus, and scutellum black; 

 femora not usually heavily infuscated; spiracular area very dark in comparison to 

 surrounding tergal area. 



O. varius: Male genitalia with aedeagus rather pointed apically (pi. 8, fig. 47) ; 

 humerus, postalar callus, and scutellum usually brown, not all black, if any; 

 femora heavily infuscated; spiracular area hardly differentiated in color from 

 tergum. 



The females of varius are more similar to j^f^H^dipennis than to 

 rufoabdominalis. Unquestionably, all three are rather closely related, 

 a fact which points to a possible Holarctic connection in the recent 

 past. 



Ogcodes (Ogcodes) dusmeti Arias 



Ogcodes dusmeti Arias, Bol. Soc. Espana Hist. Nat., vol. 20, p. 191, figs. 1, 2, 1920. 



Types: d^ and 9, Mexico (Conradt, 1903). Although the types are 

 said to be in the Museo Nacional de Ciencias Naturales, Madrid, I 

 had direct correspondence with the Museum authorities and was 

 unable to verify their presence. 



Discussion: Species of group v, judging from the description and 

 figure of wing venation. The status of this species was given b}^ 

 Sabrosky (1948) under rufoabdominalis, and is further discussed above 

 under the latter. The type locahty "Mexico" gives little help in 

 understanding dusmeti, for we actually do not know whether it is a 

 Nearctic or Neotropical representative. A study of the type material 

 will be necessary to ascertain the correct placement of this species. 



Ogcodes {Ogcodes) ndaptatiis, new species 



Plate figures 1-5, 11, 24, 25, 29, 32, 41 



Ogcodes melampus, Sabrosky, Amer. Mid. Nat., vol. 31, pp. 391-392, 1944 (not 



Loew, 1872). 

 Ogcodes pallidipennis (western subspecies ?), Sabrosky, in part, Amer. Mid. Nat., 



vol. 39, pp. 416-418, pi. 2, figs. 11, 14, 17, 1948 (not Loew, 1865). 



