BIRDS OF NORTH AND MIDDLE AMERICA. 477 



but not concave adjacent sides of the maxilla; gonys about twice as 

 long as mandibular rami, faintly convex but not prominent basally, 

 slightly concave terminally (the tip of mandible slightly decurved), 

 broadly rounded but with a very faint indication of a narrow median 

 ridge; serrations of tomia very minute, obsolete only at extremities 

 of tomia. Nostril exposed, rather large, broadly oval or roundish, 

 in anterior end of nasal fossa. No prefrontal (postnasal) bristles; 

 rictal bristles moderately developed, those of the malar apex very 

 large and strong; feathers of chin with small, slender, recurved 

 bristly tips. Head completely feathered; the feathers of the super- 

 ciliary and auricular regions elongated, somewhat stiffened, forming 

 two very conspicuous tufts on each side of head, those of median 

 portion of throat also elongated but broad and blended, margined 

 along each side by narrow, stiffened feathers. Wing rather short and 

 rounded, the longest primaries exceeding longest secondaries by less 

 than half the length of tarsus; fifth, sixth, and seventh primaries 

 longest, the eighth nearly as long as fifth, ninth intermediate between 

 third and fourth, the tenth (outermost) more than one-third as long 

 as ninth. Tail nearly twice as long as wing, excessively graduated, 

 the middle pair of rectrices nearly twice as long as the next pair, their 

 shafts denuded for a distance equal to more than half the length of 

 the second pair, the very large racquet-shaped tip much longer than 

 the cuhnen; rectrices ten, the outer pair a Httle more than two-thirds 

 as long as next pah'. Tarsus nearly as long as middle toe with claw, 

 much shorter than distance from nostril to tip of maxilla. 



Coloration. — General color olive-green, the remiges and rectrices 

 bluish green broadly tipped with black, the posterior under parts and 

 center of back tawny; conspicuous superciliary tufts light turquoise 

 blue passing into white anteriorly; orbital, loral, and auricular regions 

 black; throat-patch black margined laterally with a Hne of narrow 

 turquoise blue feathers. 



Range. — Yucatan to Costa Rica. (Monotjrpic.) 



KEY TO THE SUBSPECIES OF EUMOMOTA SUPERCILIOSA. 



a. Olive-greenisli, or greenish olive-tawny, color of breast passiiig gradually into the 

 cinnamon-rufous color of abdomen, etc., or at least the two differently colored 

 areas not abruptly contrasted; cinnamon-rufous interscapular area usually 

 smaller or less distinct. (Yucatan, Oampeche, and Tabasco.) 



Eumomota supeiciliosa snperciliosa (p. 478). 

 aa. Olive-greenish color of breast abruptly contrasted with cinnamon-rufous of abdo- 

 men, etc. ; cinnamon-rufous interscapular area usually larger and more distinct. 

 b. Coloration darker, superciliary tufts bluer, and bill relatively broader. (Southern 



Vera Cruz to Honduras.) Eumomota superciliosa bipartita (p. 480.) 



hb. Coloration paler, superciliary tufts more silvery whitish, and bill relatively nar- 

 rower. (Northwestern Costa Kica and western Nicaragua; Salvador?). 



Eumomota superciliosa australis (p. 481). 



