BIRDS OF NORTH AND MIDDLE AMERICA. 757 



sciitellation typically exavSpideaii; middle toe, with claw, about as 

 long; as tarsus, its second, as well as first, phalanx adherent to outer 

 toe, the whole of the first phalanx united to inner toe; outer toe, 

 without claw, reachino; to beyond middle of subterminal phalanx of 

 middle toe, the inner decidedly shorter; hallux (without claw) 

 slightly shorter than inner toe, not conspicuously stouter, its basal 

 pad (tylarus) neither expanded nor flattened. 



Plumage and coloration. — Contour feathers broad and blended, 

 rather loosely webbed, the head normally feathered; both sexes plain 

 olive-brown, olive, or olive greenish, paler below. 



Nidification. — (Unknown ?) 



Range. — Southern Mexico to southeastern Brazil and Peru. (Aliout 

 seven species and subspecies.) 



I have removed from this genus the several South American species 

 having a yellow or orange crown-patch and otherwise different in 

 coloration, on account of decided structural differences. So far as I 

 am able to see these belong to the genus Neopelma^ with the type of 

 which (TV. aurifrons) I have carefully compared them. (See ''Key" 

 on p. 727.) 



KEY TO THE SPECIES AND SUBSPECIES OF SCOTOTHORUS. 



a. Upper parts not olive-green. 



6. Throat and chest distinctly different in color from under parts of body. 

 c. Larger (wing more than 95, tail more than 75 mm.) (Southeastern Brazil.) 



Scotothorus turdinus (extraliniital)" 

 cc. Smaller (wing less than 95, tail less than 75). 



d. Under parts of body pale olive or grayish olive, in strong contrast with cin- 

 namon-brown of chest and throat; l)ack, etc., brown or olive-brown, the 

 crown more rufescent. {Scothothorus amazonus.) 

 e. More olive-brown above, the russet-brown crown in stronger contrast; chest 

 less deeply and less extensively cinnamon-brown. (Upper Amazon Val- 

 ley; central Colombia?) Scotothorus amazonus amazonus (extralimital) b 

 ee. More russet or cinnamon-brown aljove, the more rufescent brown of crown 

 less strongly contrasted; chest more deeply and extensively cinnamon- 

 brown. (Venezuela to eastern Panama.) 



Scotothorus amazonus stenorhynchus (j). 762) 

 dd. Under parts of body deeper, more yellowish or greenish, dlive, in slight con- 

 trast with browner olive or olive-brown of chest and throat; back, etc., 

 olive or greenish olive, the crown not more rufescent. (Scotollionts vera;- 

 pacis.) 



uMuscicapa turdina Maximilian, Beitr. Naturg. Bras., iii, pt. ii, 1831, 817 (Province 

 of Bahia, s. e. Brazil; type now in coll. Am. Mus. N. H.). — Ileteropelma turdinum, 

 Sclater, Proc. Zool. Soc. Lond., 1860, 467; Cat. Birds Brit. Mus., xiv, 1888, 319.— 

 Scotothorits turdinus Oberholser, Proc. Ac. Nat. Sci. Phila., June 2, 1899, 209. — 

 Muscicapa rvfo-olivacea Lafresnayc, Mag. de Zool., ann. 3, 1833, text, cl. ii, pi. 12-14 

 (locality not given). — Ptil[ochloris] rufo-olivaceus Lafresnaye, Rev. Zool., 1838, 238. — 

 H[eteropclma] nifo-olivaceum Cabanis and Heine, Mus. Hein., ii, 1859, 100. 



f> Heteropelma amazonum Sclater, Proc. Zool. Soc. Lond., 1860, 466 (Chainiciinis. e. 

 Peru; coll. P. L. Sclater); Cat. Birds Brit. Mus., xiv, J888, 320. — Scotulhorus aviazomis 

 Oberholser, Proc. Ac. Nat. Sci. Phila., June 2, 1899, 209. 



