264 PROCEEDINGS OF THE NATIONAL MUSEUM vol. i09 



12. Only one radial cell present; wing 0.94 mm. long; costa long, extending 

 to 0.79 of wing length; wing entirely without macrotrichia. 



uniradialis Wirth and Blanton (p. 462) 

 Two radial cells present; wing 0.72 mm. long; costa extending to 0.71 

 of wing length; wing with a few macrotrichia on distal fourth. 



pachymerus Lutz (p. 459) 



13 (11). Legs black, at most with small pale spots; mesonotum blackish, entirely 



dull gray pruinose or dark brown with gray pruinose pattern . . 14 



Legs yellow or with knees broadly yellow-banded; mesonotum yellow 



to brown, usually subshining 15 



14. Mesonotum with pattern of interconnected, subshining, dark brown 



patches luteovenus Root and Hoffman (p. 297) 



Mesonotum uniformly dark pruinose brown, without pattern. 



elutus Macfie (p. 295) 

 15 (13). Proboscis longer than height of head; legs pale including knees; wing 



pale with effect of narrow, irregular, transverse bands 16 



Proboscis shorter than height of head; legs pale with black knee spots 

 or brown with knees broadly pale; third palpal segment more or less 

 swollen 18 



16. Legs brown with knees and apex of hind tibia broadly yellow; third 



palpal segment long and slender with a small pit; mandible with 27 



teeth marshi Wirth and Blanton (p. 302) 



Legs pale including knees; mandible with 20-24 teeth 17 



17. Third palpal segment long and slender with small pit. 



efferus Fox (p. 299) 

 Third palpal segment swollen with open sensory area. 



rostratus Wirth and Blanton (p. 301) 



18 (15). Knees pale; legs brownish with broad pale bands including knees on 



apices of fore and mid femora, bases of all tibia and apex of hind 



tibia covagarciai Ortiz (p. 304) 



Knees with a black spot, at least on hind pair; legs otherwise, mostly 

 yellowish 19 



19. All knees with black spots; femora more or less brownish with subapical 



pale bands; third palpal segment with small sensory pit; basal an- 

 tennal segments monihform, the 11th segment 2-3 times as long as 



tenth 20 



Legs yellow, only hind knee with black spots; third palpal segment 

 without sensory pit; 11th antennal segment not markedly longer 

 than 10th metagonatus Wirth and Blanton (p. 306) 



20. Distal pale spot in cell Mi not attaining wing margin; pale spot strad- 



dhng vein Mi separate from the pale spot in cell R5 at end of 

 second radial cell; pale spot straddling vein M2 in form of a double, 

 more or less quadrate spot; femora blackish from near base to past 

 middle; third palpal segment slightly swollen; wing 1.66 mm. long. 



chrysonotus Wirth and Blanton (p. 312) 



Distal pale spot in cell Mj continuous anteriorly with the pale spot in 



cell R5 at the end of second radial cell; third palpal segment greatly 



swollen 21 



21. All femora dark brown from near base to past middle; tibiae brownish 



with narrow subbasal pale band; wing 1.56 mm. long. 



lutealaris Wirth and Blanton (p. 310) 



