FLIES OF THE GENUS OGCODES — SCHLINGER 311 



Discussion: The male of alhiventris is distinguished from all other 

 New World species of Ogcodes by the strikingly patterned abdomen; 

 however, the female (aside from subgeneric features) is hardly differ- 

 entiated from a number of species, particularly those of the colei 

 group. The closest relative of albivtntris is no doubt mttisternum, 

 but colei, shewelli, and floridensis are also related. 



Ogcodes species of Neotropical region 



There are now nine species known to occur in this region. Two of 

 these, dispar (Macquart) and pallidipenms Loew, are primarily 

 Nearctic in distribution and reach into this region only as far south as 

 Costa Rica. Four of the species are found in Chile and its islands, i.e., 

 chilensis Sabrosky, kuscheli Sabrosky, porteri Schlinger, and triangu- 

 laris Sabrosky. The three remaining species are herein described as 

 new and are known only from their respective type localities. These 

 are argentinensis, new species; brasilensis, new species; and colombien- 

 sis, new species. 



At least four species groups are found in this region, and it seems 

 very probable that more will be uncovered when future collecting 

 permits, since the first species of Ogcodes was only recently described 

 from this region by Sabrosky (1945). 



Ogcodes (Ogcodes) colombiensis, new species 



Plate figures 40, 108 



Species of group v. 



Male: Length of entire specimen 5.30 mm., wing length 4.55 mm. 



Head reddish brown, occiput black and narrow; antenna with one 

 seta on apex of st3de. 



Thorax with only central part of mesonotum black, remainder 

 brown, that of humerus and parts of pleura light brown, whole thorax 

 covered with short light brown pile; legs mostly light brown, hind 

 femur and tibia infuscated, the apices of tarsi nearly black as are 

 pul villi; wing evenly infuscated light brown, costal area somewhat 

 darker, vein Mi distinct, longer than R4+6, reaching to margin of wing, 

 r-m crossvein present but short, vein M2 present and distinct, all 

 veins dark brown; squama opaque, yellowish brown, margin darker, 

 entirely covered with white pile; halter brown, its stem somewhat 

 paler. 



Abdomen with tergites i-vi mostly brownish black with yellowish 

 white posterior fasciae as in plate 5, figure 29, tergites ii-iv each with 

 submedian light brown oval spot, somewhat as in guttatus, though 

 not as prominent; sternites white except that each one has a narrow 

 anterior blackish brown fascia; dorsum entirely covered with very 

 short, light brown pile. 



