FLIES OF THE GENUS OGCODES — SCHLINGER 275 



posterior fasciae on tergites; meosnotal disc with or without indications 

 of one to three longitudinal stripes; aedeagus as in pi. 7, fig. 35 (United 



States south to Costa Rica) dispar (Macquart) 



Spiracular area concolorous with tergites; abdomen dark or light brown, not 

 orange (South American species) 10 



10. Mesonotal disc dark brown with black median stripe and a black lateral 



stripe which widens and recurves forward near postalar callus; abdomen 

 of nearly uniform blackish brown with distinct posterior white fasciae; 

 tergite ii distinctly raised so as to nearly conceal view of metanotum; 

 aedeagus as in pi. 7, fig. 40 (Colombia) . . . colombiensis, new species 

 Mesonotal disc light brown with three dark brown longitudinal stripes, 

 median one complete, lateral one reaching from postalar callus to little 

 beyond wing base, straight; abdomen mostly light brown, darker brown 

 near each tergal fascia and on anterior one-half of each sternite; tergite ii 

 not raised, metanotum clearly visible, abdomen long and slender; aedeagus 

 as in pi. 8, fig. 50 (Brazil) brasilensis, new .species 



11. Dorsum of abdomen reddish orange with median row of broadly triangular 



black or brown spots; aedeagus as in pi. 7, fig. 34 (Utah). 



rufoabdoniinalis Cole [also dusmeti Arias, from Mexico] 

 Dorsum of abdomen about as in pi. 5, fig. 29, with even fasciae 12 



12. General habitus brown; humerus and postalar callus light to dark brown; 



scutellum rarely all black; aedeagus as in pi. 7, fig. 36 (Canada south to 



Costa Rica) pallidipennis Loew 



General habitus black; humerus, postalar callus and scutellum black . . . 13 



13. Abdominal tergites black with very narrow posterior white fasciae covering 



about one-fifth to one-si.xth of each segment 14 



Abdominal tergites black or dark brown with the wide posterior white fasciae 

 covering about one-fourth to one-third of each segment 15 



14. Thoracic pile short, golden yellow; sternites ii-iv with posterior white fasciae 



expanded medially; squama evenly infuscated; ejaculatory apodeme as 

 in pi. 13, fig. 107; aedeagus as in pi. 8, fig. 44 (Georgia). 



sabroskyi, new species 



Thoracic pile short, whitish yellow; sternites ii-iv with posterior white 



fasciae of even width; squama opaque white except for dark brown circular 



spot covering basal one-third; ejaculatory apodeme as in pi. 13, fig. 105; 



aedeagus as in pi. 8, fig. 49 (Canada) canadensis, new species 



15. Legs mostly black Ig 



Legs mostly brown 17 



16. Abdominal sternites i and much of ii mostly black; abdominal tergites with 



posterior white fasciae covering about one-fourth of each segment; eyes 

 black; r-m crossvein distinct; ejaculatory apodeme as in pi. 6, fig. 32; 

 aedeagus as in pi. 7, fig. 41 (western North America). 



adaptatus, new species 



Abdominal sternites i and one-half of ii mostly white; abdominal tergites 



with posterior white fasciae covering about one-third of each segment; 



eyes brown; r-m crossvein indistinct; ejaculatory apodeme as in pi. 13, 



fig. 100; aedeagus as in pi. 8, fig. 45 (ISew York) . . hennigi, new species 



17. Abdominal tergites with posterior white fasciae enlarged medially; legs mostly 



dark brown, tibiae light brown, apices of tarsi black; r-m crossvein absent; 

 ejaculatory apodeme as in pi. 13, fig. 103; aedeagus as in pi. 7, fig. 39 

 (Argentina) argentinensis, new species 



523799—60 4 



