, 
6 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
of C. acutipennis (Bodd.) Cass., of South America. (See Sclater, P. Z.S. 
1866, p. 154, and Hist. N. Am. B., II, pp. 400, 407.) 
267. Chordeiles POPETUE (Vieill.) Baird.—Brisson’s name virginianus 
was not restricted to this species until many years after the institu- 
tion of Vieillot?’s name popetue ; the latter, therefore, notwithstanding 
its barbarous character, is, by all the rules, entitled to retention. 
269. CYPSELUS sawatilis (Woodh.) Ridgw.—This species agrees so very 
closely in details of strueture with C. melba, Linn., that there seems to be 
no good reason for separating it genericaly fore the genus Cypselus, 
unless CO. melba also is removed to another genus. The type of Panyp- 
tila being the Cypselus cayannensis, Ginel., the elimination of CO. 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 C. 
apus, the latter being the type of Cypselus. C. apus has the feet much 
weaker and the tarsus much more densely feathered than C. melba; 
C. saxatilis is nearly intermediate in this respect, though coming much 
nearer to C. melba. 
273. BASILINNA wantusi (Lawr.) Elliot.—See Elliot’s “Synopsis of 
the Trochilidz* ”, p. 227. 
234. Trogon Hee Gould.—The species described in “Birds of 
North America,” and figured in the atlas to that work, is the present 
one, and not 7. 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. XENOPICUS albolarvatus (Cass.) Bd.—In addition to the very 
tangible external characters pointed out by Professor Baird in his char- 
acterization of a subgenus Xenopicus (B. N. Am., p. 83), may be men- 
tioned the fact that the tongue is scarcely extensile, its tip, when fully 
protruded, reaching only ? of an inch beyond the tip of the bill, or just 
the same as in Sph ieee thyroideus, while in Picus villosus ieee the 
protrusion amounts to 24 inches, or 13 inches more! (See Orn. 40th 
Parallel, pp. 546, 548, and 552, under lists of specimens of the above 
species.) 
301. Picoides TRIDACTYLUS americanus (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 Classification and Synopsis of the Trochilide. By Daniel Giraud Elliot, F. R. 
8. E., etc. Washington City: Published by the Smithsonian Institution [‘Smith- 
sonian Contributions to Knowledge,” No. 317.] [March, 1879.] 
