BIRDS OF NORTH AND MIDDLE AMERICA. 161 
kk. 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 
phattes cc eechsseastesseeacn Phacellodomus (extralimital).¢ 
a. Bill much more slender, with culmen much less strongly curved 
(usually nearly straight), less compressed, less sharply ridged; 
rictus not deflected...........-....- Asthenes (extralimital).6 
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).¢ 
ii. Smaller (wing less than 70 mm., exposed culmen less than 15 
mm.); without streaks (except sometimes, on pileum.) 
Acrorchilus (p. 183). 
Jf. Rectrices 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 
@ Phacellodomus Reichenbach, Handb. der Spec. Orn., 1853, 169. Type, Anabates 
rufifrons 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 sér., i, 1854, 132. 
b Asthenes Reichenbach, Handb. der Spec. Orn., 1853, 168. Type, Synallazis 
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. hwmicola (Kittlitz), A. modesta (Eyton), A. anthoides 
(King), A. wyatt: (Sclater and Salvin), A. sulphurifera (Burmeister), A. striaticeps 
(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. orbignit (Reichenbach), S. arequipx 
(Sclater and Salvin), S. humilis (Cabanis), and S. pudibunda (Sclater). How nearly 
related may be 8. 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. 
¢ Thripophaga Cabanis, Wiegmann’s Archiv fir Naturg., xiii, pt. i, 1847, 338. 
Type, Sphenurastriolata Lichtenstein. (Southeastern Brazil; Colombia? ; twospecies?.) 
I have not seen 7. guttuligera Sclater, from Colombia, which may or may not be 
congeneric with 7. striolata. 
4 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 
