BIRDS OF NORTH AND MIDDLE AMERICA. 607 



Genus HENICORHINA Selater and Salvin. 



Heterorhina (not of Westwood, 1845) Baird, Review Am. Birds, Aug., 1864, 94^ 



115. (Type, Scytalopus prostlieleucus Sclatei.) 

 Henicorhina Sclater and Salvin, Proc. Zool. See. Lond., 1868, 170 (substitute 



for Heterorhina Baird, preoccupied). 



Very small Troglodytidee (wing 49-60 mm.) most resembling Nami- . 

 orchilus, but with tail only half as long as wing, nostril opening through 

 middle of nasal fossa, and coloration verj^ different (sides of neck 

 streaked with black and white). 



Bill shorter than head^ nearly straight, moderately compressed 

 anterior to nostrils, its depth at latero-frontal antise equal to or slightly 

 less than its width at same point, and equal to one-third the distance 

 from nostril to tip of maxilla, or less; exposed culmen longer than 

 middle toe without claw, very much shorter than tarsus, very faintly 

 if at all curved until near tip, where gradually decurved; gonys much 

 shorter than distance from nostril to tip of maxilla; maxillary tomium 

 straight or very faintly concave, distinctly notched subterminally ; 

 rictus slightly deflexed. Nostril longitudinal, fusiform or elliptical, 

 surrounded by membrane except in front. Eictal bristles obvious, two 

 or three of them quite distinct. Wing short, much rounded, very con- 

 cave beneath; seventh and sixth, or seventh, sixth, and fifth primaries 

 longest; eighth intermediate between first and second; ninth very 

 much shorter than secondaries, much less than twice as long as tenth. 

 Tail very short, about half as long as wing, much rounded, the rectrices 

 broadly rounded at tip. Tarsus very long (about half as long as 

 wing), the acrotarsium distinctly scutellate, the planta tarsi booted; 

 middle toe with claw much shorter than tarsus; outer toe (without 

 claw) reaching to considerably beyond subterminal joint of middle toe, 

 its claw not reaching to base of middle claw; inner toe slightly shorter 

 than outer; hallux (without claw) as long as outer toe (without claw), 

 but much thicker, its claw decidedly shorter than the digit; basal 

 phalanx of middle toe adherent to outer toe for greater part of its 

 length, to inner toe for more than half its length. 



Coloration. — Above brown, the wings and tail barred with black; 

 pileum and hindneck (at least laterally) black; sides of head and neck 

 black streaked with white, these streaks very conspicuous on sides of 

 neck; under parts white, becoming gray on sides and brown on flanks, 

 or else almost wholly gray. Young not essentially different from 

 adults. 



Nidification. — Nest (oiH. prosthele^ica) "formed of mosses inter- 

 woven with great skill . . . lined with red feathers from the abdomen 

 of Trogon mexicanus . . . suspended or rather fastened to the branches 

 of shrubs, and so skillfully done ... as to be readily mistaken for a 

 bunch of moss."" 



Range. — Southern Mexico to Peru, Bolivia, and Guiana. 



oSumichrast, Mem. Bost, Soc N. H., i, 1869, 545, 



