FLIES OF THE GENUS OGCODES — SCHLINGER 313 



fasciae with very narrow dark brown fasciae immediately preceding 

 each fascia on tergites ii-v; sternites light brown except for white 

 posterior fasciae on ii-v and dark brown anterior fasciae on ii-iv; 

 sternite vi is long and rather broadly overlapping tergite vi at lateral 

 margin ; both dorsum and venter covered with short brown pile. 



Genitalia light and dark brown; aedeagus as in plate 8, figure 50, 

 ejaculatory apodeme as in plate 5, figure 106. 



Female: Unknown. 



Holotype: Male, Nova Teutonia, "27° 11' B. 52° 23' L.," Brazil, 

 Apr. 22 (?), 1938 (Fritz Plaumann, BMNH 1939-66). 



Remarks: This is the first record of the genus for Brazil, and one 

 of the seven species now known to occur in South America. It has 

 no known close relative. 



Ogcodes (Ogcodes) argentinensis, new species 



Plate figures 39, 103 



Species of group v. 



Male: Length of entire specimen 3.50 mm., wing length 3.00 mm., 

 as described for adaptatus, new species, except as follows: 



Head mth brown eyes, antenna light brown. 



Thorax black except for brown mesopleural area, covered with 

 short brown pile; legs dark brown except tibiae light brown and 

 tips of tarsi black; wing venation about as in plate 3, figure 11, but 

 Ml and M2 faint, r-m crossvein absent; squama opaque brown, halter 

 stem light brown, knob dark brown. 



Abdomen with posterior white tergal fasciae somewhat enlarged 

 medially, dorsum covered with sparse, short, nonappressed brown 

 pile, somewhat longer medially; sternites as in adaptatus except brown 

 and white instead of black and white. 



Genitalia brown; aedeagus as in plate 7, figure 39; ejaculatory 

 apodeme as in plate 13, figure 103. 



Female: As described for adaptatus except as follows: legs mostly 

 dark brown ; parts of pleurae light brown ; postalar callus, metanotum 

 and apical margin of scutellum dark brown; abdomen dark brown 

 with narrower posterior white tergal fasciae. 



Holotype: Male, Chascomus, Buenos Aires, Argentina, Feb. 6, 

 1954 (Ibarra Grossa, USNM 64443). 



Paratopotypes: 2cr, 1 9 (EIS). 



Remarks: This is the first record of an Ogcodes species from Argen- 

 tina. Although there are now nine species of this genus known from 

 the Neotropical region, none of those described is apparently closely 

 related to argentinensis, with the possible exception of colombiensis. 

 It appears that the Nearctic adaptatus and boharti are most closely 



