76 
THE CONDOR 
I Vol. Ill 
ally shading into sinoky-drab on the chest and hind neck; the color of the chest ending ab- 
ruptly against the white of the belly. The under parts posterior to fore-breast and axillaries 
and an oblique bar across middle of under wing coverts w'hite. Coloration of naked parts in 
life: bill yellowish-green, becoming more greenish basally; gular sac dark pea-green; bare skin 
before eye purplish-violet; feet pea-green. Length 720 mm., wing 384 mm., tail 200 mm., 
culmen94 mm., depth of bill 32 mm., tarsus 46., middle toe 80 mm. 
Adult female like the male in coloration, exce])ting the head and neck which are uniform with 
the back in color, the feathers bordering the naked parts of the head slightly grayer. Size 
.somewhat larger than in the male. 
Compared with specimens of 5". breivsteri ixorsx Cocos Island, the Clipperton 
specimens are conspicuously lighter with green bills and with feet greenish rather 
than yellowish. This is a common bird on Clipperton Island where it breeds in 
company with S. cyunops on the flat expanse of the coral beach bordering the la- 
goon. 
MR.\suREMiiNTS OF Sill a fiesiotes. 
I,. S. J.U. I.ocality 
Mils. No. 
Sex 
I.ength 
Wing 
Tail 
Tarsus 
Culmen 
Kasai Depth 
of Bill. 
Middle 
Toe 
4271 Clipperton Id. 
ad 6 
720 
3«4 
200 
46 
94 
34 
80 
4^79 
“ ? 
800 
416 
220 
48 
98 
33 
86 
4275 
“ ? 
840 
404 
190 
49 
102 
37 
89 
4272 
“ $ 
800 
405 
220 
45 
lOI 
35 
86 
5. Micranous diamesus, new species. 
Type — Adult male; No. 5079 Leland Stanford Junior University Museum; Cocos Island, Juh' i, 
1899. 
Range — Cocos and Clipperton Islands, tropical eastern Pacific. 
Specific characters. — Near Micranous hawaiiensis Rothschild of the Haw’aiian Islands, but dif- 
ers from this species in being darker on the shoulders, on the lower part and sides of the neck and 
on the sides of the head, and in having a more slender and shorter bill and shorter tarsus. 
Description of the Type — Forehead and top of head almost pure white, back part of head and 
nape with a plumbeous tinge. Back of neck plumbeous, darkening into dark plumbeous on 
shoulders and then into brown on the mantle. Rest of upper parts, except upper tail-coverts 
and tail, dark dusky brown; outer webs of outer primaries sooty-brown, almost black. Upper 
tail-coverts and tail, dark plumbeous-gray. Under parts dark dusk3’-brown, darkest on lower 
breast and on belly. Lower tail-coverts somewhat lighter plumbeous-brown. Tail below same 
color as above. Lores and line extending from lores over eye to middle of posterior side of eye, 
black, a small white spot in this line above posterior part of eye. Lower two-thirds of low’er 
eyelid white. Cheeks deep dark plumbeous, pale color of back of head and neck scarce!}' ex- 
tending upon lateral parts. Length 388 mm., wing 224 mm., tail 130 mm., culmen 45.3 mm. 
tarsus 21.5 mm. 
Iininature male. — Top of head pure white, with a few brown feathers posteriorly. Outer webs 
of outer primaries blackish-brown, that of the first almost black. Lores, supraocular line and 
cheeks, dusky brown. All other parts pure dark brown, but with no dusky tiiige except on the 
lower part of the throat. 
Adult female. — Does not differ from the adult male. 
In Micranous hawaiiensis W\Q. pale slaty plumbeous color of the back of the head 
and neck reaches .so far ventrally on the sides of the head, neck and even on the 
upper part of the breast, that there is distinctly marked off on the chin and throat 
a median longitudinal area of dark plumbeous-brown well defined on each side 
against the paler lateral parts. 
Micranous diamesus is intermediate between M. leucocapillus Gould of the Carib- 
bean Sea, Atlantic and Indian Oceans and the western Pacific, and M. hawaiiensis 
Rothschild of the Hawaiian hslands in both color of the plumage and the size of 
bill. 
One adult male, four adult females and two immature females from Cocos Island 
