6 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



of C. acHtipenms (Bodd.) Cass., of South America. (See Sclater, P. Z. S. 

 18G6, p. 131, and nist. X. Am. B., TI, pp. 400, 407.) 



2G7. ChordeilcH popetue (Vieill.) Baird. — Brisson's name virgimanus 

 was not restricted to this S])ecies until many years after the institu- 

 tion of Vieillot's name popetve : the latter, therefore, notwithstanding 

 its barbarous character, is, by all the rules, entitled to retention. 



201). CvpsELUS Ha.mtUh{\\oo(\\i.) Ridgw. — This species agrees so very 

 closely in details of structure with (J. nielba, Linn., that there seems to be 

 no good reason for separating it genericaly from the genus Cypselus, 

 unless C. melba also is removed to another genus. The type of Panyp- 

 tila being the Cypselus cayannensis, Gmel., the elimination of C. saxatilis 

 does not, of course, affect the validity of the latter genus, as properly 

 restricted; still, there is not much more difference of form between 

 '•'■ Panyptila'''' cayennensis and C. saxatilis than between C. melba and G. 

 apus, the latter being the type of Cypselus. C. apus has the feet much 

 weaker and the tarsus much more densely feathered than G. melba; 

 G. saxatilis is nearly intermediate in this respect, though coming much 

 nearer to C. melba. 



273. Basilinna xantusi (Lav/r.) Elliot. — See Elliot's " Sj^nopsis of 

 the Trochilidiii* ", p. 227. 



284. Trogon AivmiGUUS, Gould, — The species described in "Birds of 

 Xorth America," and figured in the atlas to that work, is the present 

 one, and not T. mexicanus. The latter is chiefly distinguished by the 

 absence of white bars on the tail-feathers, which are uniform black un- 

 derneath, except the broad white tip. 



295. Xenopious albolarvatns (Cass.) Bd. — In addition to the very 

 tangible external characters pointed out by Professor Baird in his chai'- 

 acterization of a subgenus Xe)iopicus (B. X. Am., p. 83), may be men- 

 tioned the fact that the tongue is scarcely extensile, its tip, when fully 

 protruded, reaching only f of an inch beyond the tip of the bill, or just 

 the same as in Sphyropicus thyroideus, while in Ficus villosus harrisi the 

 protrusion amounts to 2J inches, or If inches more! (See Orn. 40th 

 Parallel, pp. 546, 548, and 552, under lists of specimens of the above 

 species.) 



301. Picoides tridactylus americamis (Brehm) B. B. & R. — As 

 pointed out in "History of North American Birds" (Vol. II, pp. 529- 

 534), the differences between the American and European white-backed 

 species of this genus are very slight, and by no means sufficient to warrant 

 specific separation. The common form should therefore be known as 

 above, and the Rocky Mountain race, if deemed sufficiently distinct, as — 



* A Classilication and Synopsis of the l^ocbilidse. By Daniel Giraud Elliot, F. R. 

 S. E., etc. Washington City: Published by the Smithsonian Institution ["Smith- 

 sonian Contributions to Knowledge," No. 317.] [March, 1879.] 



