BIRDS OF NORTH AND MIDDLE AMERICA. 357 
Large Trochilide (length about 115-140 mm.) with bill much longer 
than head, straight to decidedly decurved; tail two-thirds to three- 
fourths as long as wing, slightly rounded; very weak feet; and shafts 
of outer primaries thickened basally Gn adult males excessively so). 
Bill slightly longer than head (in C. hyperythrus) to one and a half 
times as long, straight (C. hyperythrus, C. rufus, C. largipennis, and 
C. obscurus) to decidedly decurved (C. ensipennis, C. hemileucurus, 
C. lazulus, and C. villavicencio); tomia smooth; both mandible and 
maxilla with a distinct lateral groove, the former on basal half, mainly. 
Nostril narrow, slit-like, overhung by a broad, convex, tumid, mostly 
unfeathered membrane, but frontal feathering reaching to or beyond 
middle of upper portion. Tarsus densely feathered, slender, about as 
long as anterior toes; middle and inner toes equal in length, the inner 
very slightly shorter; hallux decidedly shorter than outer toe; middle 
toe united to outer for whole of its basal phalanx, to inner toe for 
less that distance; all the toes weak and slender, and claws rela- 
tively small. Wing about three times as long as exposed culmen, the 
outermost primary longest; three outer primaries with shafts more 
or less thickened basally, especially in adult males, in which the shaft 
of the outermost is greatly enlarged and strongly bowed toward 
middle portion. Tail two-thirds to three-fourths as long as wing, 
slightly rounded, the rectrices very broad, rounded terminally (in 
C. obscurus tapering and pointed terminally). 
Coloration.—a. Saepiopterus: Metallic green or green and violet 
above, the tail black, with lateral rectrices extensively white termi- 
nally, or Gn C. lazulus) chestnut tipped with green; adult males with 
under parts metallic blue or violet, or green with violet throat; adult 
females with under parts gray mixed with green on sides and blue on 
throat. 6. Campylopterus: Above metallic bronze green, including 
middle rectrices, the outer rectrices blackish with broad white tips; 
beneath wholly light gray; sexes alike. (C. largipennis, C. obscurus.) 
c. Platystylopterus: Above metallic bronze green, the middle rec- 
trices greenish bronze or golden bronze; other rectrices (at least in 
part) light cinnamon-rufous; under parts wholly light cinnamon- 
rufous. Sexes alike, or very nearly so. 
Although for present purposes it may be as well to retain the genus 
Campylopterus with its generally recognized limits I am convinced 
that the genus as so recognized is not a natural group, but a combina- 
tion of at least two and probably three generic groups, as indicated in 
the paragraph describing coloration. The species with uniform gray 
under parts (in both sexes) closely resemble those of the genus Pampa 
in coloration (except for the absence of a blue or violet frontal patch), 
and the relationship is still further indicated by the form of the rec- 
trices in C. obscurus, for, while the tail is slightly rounded (not gradu- 
