274 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



Rather than attempt to make individual keys to the Ogcodes species 

 of North and South America, it was felt that one key would be more 

 practical, particularly since it now seems very possible that a few 

 species may be found to occur in both areas. Parts of this key were 

 adapted from Sabrosky (1948), and although the key was made pri- 

 marily for males, females of most species will key out. Females of the 

 following species are unknown: chilensis Sabrosky, fioridensis Sa- 

 brosky, porteri Schlinger, shewelli Sabrosky, triangularis Sabrosky, and 

 the new species boharti, brasilensis, canadensis, colombiensis, hennigi, 

 and sabrosky I. Males are unknown for niger Cole. 



Key to the American species of Ogcodes Latreille 



1. Vein Ml present and distinct throughout its length, usually attached basally 



to the stub or r-ra crossvein (pi. 3, fig. 6) 2 



Vein Ml absent, or present only as a crease, or possibly veinlike in the distal 

 portion (pi. 3, figs. 9, 12; pi. 4, figs. 16-19) . . . .' 18 



2. Crossvein m-cu present and distinct, though sometimes faint in its approach 



to vein M4 3 



Crossvein m-cu absent 8 



3. Abdominal tergites dark brown to black with light brown to white posterior 



fasciae (about as in pi. 5, fig. 29) ; r-m crossvein present or absent ... 4 



Abdominal tergites with white or yellow spots in addition to posterior fasciae; 



r-m crossvein absent 5 



4. Body ground color black; antenna whitish; r-m crossvein absent; only female 



holotype known (Utah) niger Cole 



Body ground color brown; antenna brown; r-m crossvein present; aedeagus 

 as in pi. 9, fig. 56 (Canada and northern United States) . borealis Cole 



5. Abdominal venter with three rows of blackish brown spots composed of 



a large subquadrate median spot and a lateral spot on each sternite except 



I, which is entirely black ; abdominal pile scarce and quite browned; aedeagus 



as in pi. 10, fig. 63 (Oregon and Washington). . . . vittisternum Sabrosky 



Without the above combination of characters 6 



6. Second tergite entirely yellow, the third and fourth tergites with three 



brown spots, the fifth and sixth almost entirely shining brown; abdominal 

 venter mostly bright yellow including sternite i; aedeagus about as in pi. 



10, fig. 63 (Florida) fioridensis Sabrosky 



Second to fourth tergites each with large median spot; venter mostly white. 7 



7. Second to fourth tergites each with a median triangular black spot; femora 



and tibiae bright yellow; aedeagus as in pi. 10, fig. 62 (eastern Canada and 



New York) shewelli Sabrosky 



Second to fourth tergites each with a broad subquadrate black spot; femora 

 infuscated basally; aedeagus as in pi. 10, fig. 64 (Arizona and California). 



colei Sabrosky 



8. Mesonotal disc with stripes or patterned, or if not striped, then ground color 



dark orange, light brown or yellow 9 



Mesonotal disc not patterned, ground color black 11 



9. Spiracular area usually as dark brown spots contrasting with lighter colored 



tergites; abdomen orange to light brown with white or brownish white 



