BIRDS OF IsrORTH AND MIDDLE AMERICA. 161 



Tele. Wing very nearly as long as tail (more than eight-ninths as 

 long), the latter graduated for only half its length; tarsus 

 longer than middle toe with claw; bill relatively shorter 

 and deeper; feathers of chest without thickened or widened 



shafts Phaceilodomus (extralimital).'i 



ii. Bill much more slender, with culmen much less strongly curved 

 (usually nearly straight), less compressed, less sharply ridged; 



rictus not deflected Asthenes (cxtralimital).^ 



hh. Tarsus much less than one-third as long as wing; frontal feathers 

 not extending so far forward, the nostrils and nasal operculum 

 being uncovered for much the greater part. 

 i. Larger (wing more than 70 mm., exposed culmen more than 15 

 mm.); conspicuously streaked both above and below. 



Thripophaga (extralimital ) .c 

 ii. Smaller (wing less than 70 mm., exposed culmen less than 15 

 mm.); without streaks (except sometimes, on pileum.) 



Acrorchilus (p. 183). 

 ff. Rpctrices 10. 



g. Tail not more than one and a half times as long as wing (usually much 

 less, sometimes shorter than wing); upper parts not streaked. 



Synallaxis (p. 186). 

 gg. Tail nearly twice as long as wing; upper parts streaked. 



Schceniophylax (extralimital).*^ 

 ee. Basal phalanx of middle toe wholly united to outer toe; bill more wedge- 

 shaped, with culmen nearly straight (if curved more so toward base 

 than terminally), the mesorhinium flattened; wing relatively longer 



^ Phaceilodomus R,eichenbach, Handb. der Spec. Orn., 1853, 169. Type, Anabates 

 rujifrons Maximilian. — Phacelodomus (emendation) Sclater, Cat. Birds. Brit. Mus., 

 XV, 1890, 79. — Placellodomus (emendation) Sclater and Salvin, Proc. Zool. Soc. Lond., 

 May, 1868, 141. — Phacellodromus (emendation) Bonaparte, Ann. Sci. Nat. (Zool.), 

 4 ser., i, 1854, 132. 



b Asthenes Reichenbach, Handb. der Spec. Orn., 1853, 168. Type, Synallaxis 

 sordida Lesson. (Andes of Colombia to Chile, Argentina, etc.; at least eight species.) 



This group unquestionably requires subdivision, but I have not a sufficient repre- 

 sentation of the species to justify an attempt to do so. Besides the type-species I 

 have examined the following: A. humicola (Kittlitz), A. modesta (Eyton), J., anthoides 

 (King), A. wyatti (Sclater and Salvin), A. sulphurifera (Burmeister), A. stria.ticeps 

 (D'Orbigny and Lafresnaye), and A. maluroides (D'Orbigny and Lafresnaye). The 

 three last are almost certainly distinct generically. Probably nearly related to 

 Asthenes, if not actually belonging to it, are the following species, referred, like the 

 others, to Siptornis by recent authorities: S. orbignii (Reichenbach), S. arequipse 

 (Sclater and Salvin), S. humilis (Cabanis), and S. pudibunda (Sclater). How nearly 

 related may be 'S'. albiceps (Lafresnaye and D'Orbigny) and S. albicapilla (Cabanis) — 

 the former being the type of Cranioleuca Reichenbach (Handb. der Spec. Orn., 1853, 

 167) — I am unable to say, not having seen either. 



c Thripophaga Cabanis, Wiegmann's Archiv fiir Naturg., xiii, pt. i, 1847, 338. 

 Type, Sphenurastriolata Lichtenstein. (Southeastern Brazil; Colombia?; two species?.) 



I have not seen T. guttuligera Sclater, from Colombia, which may or may not be 

 congeneric with T. striolata. 



d Schoeniophylax Ridgway, Proc. Biol. Soc. Wash., xxii, April 17, 1909, 71. Type, 

 Sylvia phryganophila Vieillot. (Southern Brazil, Paraguay, Uruguay, and Argen- 

 tina; monotypic?.) 



81255°— Bull. 50—11 11 



