822 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



rather strongly iiiiciiiate; gonys about as long as mandibular rami, 

 nearly straight, sometimes with a distinct median ridge; basal width 

 of interramal space about equal to its length; maxillary tomium 

 'gently concave for anterior portion, gently or faintly convex pos- 

 teriorly, with very distinct subterminal notch. Nostril mostly 

 exposed, rather large, roundish or broadly oval, with distinct carti- 

 laginous tubercle showing within upper posterior portion. Rictal 

 bristles distinct, the latero-frontal antia^ also with well-developed 

 bristles in two series, the lower decurved and overlying basal half of 

 maxillary tomia the upper arching over nostrils and base of culmen. 

 Wing moderate, with primaries exceeding secondaries by more than 

 length of exposed culmen; seventh and eighth, or sixth, seventh, and 

 eighth, primaries longest, the tenth equal to or longer than fourth. 

 Tail nearly as long as wing (longer than distance from bend to end of 

 secondaries), nearly even (sometimes faintly emarginate), the rectrices 

 moderately broad, with rounded tip. Tarsus about as long as exposed 

 culmen, or longer, its scutellation essentially pycnaspidean, but 

 acrotarsal scutella occupying less than anterior half on outer side, 

 which sometimes has a single continuous row of large hexagonal 

 scutella; middle toe, with claw, about as long as tarsus, its basal 

 phalanx wholly adherent to outer and at least half united to inner toe ; 

 outer toe much shorter than the middle, reaching but little beyond 

 subterminal phalanx of the latter, the inner toe still shorter; hallux 

 about as long as inner toe or a little shorter, its basal pad (tylarus) 

 but very slightly expanded and flattened. 



Plumage and coloration. — Contour feathers broad and blended or 

 but faintly outlined, those of the pileum slightly lengthened and more 

 individually defined. Color plain gray, cinnamon-rufous, or olive- 

 green, tw^o species with yellow axillars and under wing-coverts and a 

 crown-spot of black or chestnut, another with a collar round neck 

 and under tail-coverts rose-pink. 



Nidification. — (Unknown ?) 



Range. — Southern Mexico to southeastern Brazil and eastern 

 Ecuador. (Eight species, only one of them occurring north of the 

 Isthmus of Panama.) 



KEY TO THE SUBSPECIES OF LATHRIA UNIRUFA.O 



a. General color paler, more cinnamomeous. 



b. Coloration darker or duller, especially on back and chest; larger (male averaging 

 wing 140, tail 108.9; female, wing 134.7, tail 105.2). (Eastern Mexico to Gua- 

 temala.) Lathria unirufa unirufa (p. 823) 



oThe several South American species are very differently colored from L. unirufa, 

 and having seen only two of them — L. cinerea (Vieillot)and L. /u.scocinerf a (Lafresnaye) — 

 I will not venture to include them in the key, especially since I have doubts as to 

 some of them being really referable to this genus. 



