338 



BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



Subgenus RuPORNis Kaup 



Small butconine hawks with the tarsus bare for the greater (lower) 

 part and \\dth the longest primary exceeding the distal secondary by 

 much less than one-third the length of the wing. 



Plumage. — Full, fairly compact: coloration brownish above, the 

 underparts whitish barred or sufi'used with grayish rufous. 



7?an.9e.— Tropical America from Mexico and the Lesser Antilles 

 south to Argentina (two species with many races). 



BUTEG MAGNIHOSTRIS GRISEOCAUDA Ridgway 



MiRADOR Insect Hawk 



Adult (sexes alike). — Upperparts nearly uniform grayish brown 

 (dark drab to hair brown) the feathers with dusky shafts, and those 

 of the dorsal region and wings with very narrow and rather indistinct 

 paler margins, especially terminally: longer upper tail coverts bnff, 

 or pale ochraceous, marked with sharply defined transverse, nearly 

 reniform spots of umber brown; tail light drab to drab, crossed by 

 four bands of black, averaging about 12-15 mm. wide, or nearly as wide 

 as the brownish gray interspaces; the ^vidth gradually decreasing, 

 however, from the last, or subterminal one, which is succeeded by a 

 narrower band of brownish gray, gradually passing into dull whitish 

 at the terminal margin; extreme base of the tail (concealed by the 



Figure 20. — Buteo {Rupornis) magnirostris. 



