BIRDS OP NORTH AND MIDDLE AMERICA, 



417 



CAMPTOSTOMA PUSILLUM FLAVIVENTRE ( Sclater and Salvin). 

 YELLOW-BELLIED CAMPTOSTOMA. 



Similar to C. p. pusiUum" but yellow of under parts deeper and mucli 

 clearer, with little if any gray shading on throat or olive on chest; 

 the upper parts lighter olive, and size averaging decidedly greater. 



Adults {sexes alike). — Pileum varying from deep hair brown or 

 sepia to dark grayish brown or sooty; back, scapulars, and lesser 

 wmg-coverts plain light greenish olive, the rump and upper tail- 

 coverts similar but paler and slightly more yellowish; tail deep olive 

 or dusky hair brown, the rectrices narrowly tipped with pale brownish 

 huffy or dull brownish white and edged with light olive; wings dusky, 

 the middle and greater coverts broadly tipped with pale yellowish 

 olive or dull whitish, forming two conspicuous bands, the secondaries 

 etlged (except basally) with the sam.e (or a more yellowish hue), 

 more broadly on the innermost, on which the pale edging extends 

 round the tip; sides of head olive-grayish relieved by an indistinct 

 narrow superciliary streak of dull whitish, the eyelids also dull whitish, 

 the auricular region with fuie shaft-streaks of the same; chin and 

 u])per throat dull white, the remaming under parts, including under 

 wing-coverts, light yellow (straw to primrose) very faintly shaded on 

 chest with pale olive; inner webs of remiges edged with pale cream- 

 yellow or creamy white; maxilla dark brown or brownish black, 

 mandible pafer brown, darker terminally; iris brown; legs and feet 

 dusky (in dried skins). 



Young. — Essentially like adults, but middle and greater ^\dng- 

 coverts broadly tipped with cinnamon instead of pale yellowish olive. 



Adult ma?e.^Length (skins), 79-101 (96); wing, 48.5-56 (52.5); 

 tail, 35-42.5 (38.4); exposed culmen, 8-9.5 (8.8); tarsus, 13-14.5 

 (13.8); middle toe, 8-9 (8.4).^ 



Adult female.— Length, (skins), 88-97 (92); wing, 47.5-51.5 (49.2); 

 tail, 33.5-38.5 (35.1); exposed culmen, 8.5-9 (8.6); tarsus, 12-14.5 

 (13.5); middle toe, 8-8.5 (8.2).« 



oSee p. 413. # 



& Fifteen specimens. 



c Eight specimens. 



Specimens from different geographic areas compare as follows in measurements: 



Locality. 



Middle 

 toe. 



MALES. 



Three adult males from Costa Kioa 



Four adult males from Panama 



Five adult males from San Miguel Island, Bay of Panama. . . 



Two adult males from Saboga Island, Bay of Panama 



One adult male from Pacheca Island, Bay of Panama 



Three adult males of C. p. 7iapajUTO( Venezuela and Trinidad) . 

 11422— VOL 4—07 — --27 



8.2 

 8.7 

 8.4 



8.2 



