430 REVIEW OF AMERICAN BIRDS. [PART I. 
(No. 16,168.) Fresh specimen: Total length, 8.10; expanse of wing, 13.20; 
wing from carpal joint, 4.50. Prepared specimen: Total length, 8.00; wing, 
4.40; tail, 4.40, depth of fork, .42; difference between 10th and longest pri- 
mary, 1.22; exposed portion of Ist primary, 1.00, of 2d, 3.00, of longest, 4th 
(measured from exposed base of Ist primary), 3.45; length of bill from fore- 
head, .60, from nostril, .30, along ‘gape, .71 ; tarsus, .80; middle toe and claw, 
.80, claw alone, .24; hind toe and claw, .50, claw alone, .26. 
On the chin and crissum the tips of feathers are much lighter 
than the ashy bases, producing a mixture of the two colors, although 
this is scarcely appreciable in some specimens. There is a very © 
faint indication occasionally of a dusky line on each side of the chin, 
as in MW. obscurus. 
Young birds have a large triangular pale ri Rite e light spot on 
the end of each feather (rather paler below), bounded externally by a 
narrow border of blackish; the quill- and tail-feathers as in the adult. 
The more important localities of specimens before me are as 
follows :— 
| 
Smith- '|Collec-} Sex When , 
sonian| tor’s | and Locality. Collected Received from Collected by 
No. No. | Age. | 7 
hs | eee — ere 
2,922 are ats | Columbia River. aot 8S. F Baird. J.K. Townsend, 
8,285 “P | Fort Steilacoom. res DraGjBuckloys VP (eee 
16,164 he ! Fort Crook, Cal. ese Jno. Weillinerss -|P oeeocs 
21,942 | 623 -. | Kootenay River. Aug. 1860. A. Campbell. Dr. Kennerly. 
21,943 612 od ! Flathead River. Sept. 8, ’60. ce a 
19,225 | 162 al Pumpkin Butte. Oct. 22. Capt. Raynolds. Dr. Hayden. 
11,056 a8 @ | Fort Bridger, Utah.| May 6. CDrexiers rr | ee tearteret 
18,325 a6 o | Hellgate, ‘Td. 1860. Lt. Mullan. Jno. Pearsall. 
38 427 us Laramie Peak. 1864. Dr Ate oe ei | eee eee 
8,286 ald -» | Zuni. AIC Lt. Whipple. Dr. Keunerly. 
(2,922) Type of species. 
Myiadestes ObDSCUrUS. — Fy 
Myiadestes obscurus, LAFR. Rev. Zool. 1839, 98 (Mexico).—ScLaTER, 
P. Z. S. 1856, 300 (Guatemala) ; 1857, 5, 213 (Orizaba) ; 1859, 
364 (Jalapa) ; 376 (Oaxaca; eggs).—Is. Catal. 1861, 47, no. 288.— 
Bon. Consp. 336.—Scrater & Sarvin, Ibis, I, 1859, 14 (Guatemala). 
Hab. Mountainous regions of Mexico, into Guatemala ; Tres Marias Islands. 
(No. 37,500.) Wing about equal to tail, which is emarginate and rounded. 
Fourth quill longest ; 5th and 3d a little shorter ; 2d longer than 7th ; 1st two- 
fifths the 2d. 
Back olivaceous-rufous, more olive on rump and upper tail coverts: the 
outer surface of wings, including edges of quills, more rufous cinnamon. A 
pale cinnamon concealed patch at base of inner webs of quills, abruptly de- 
fined on the secondaries, fading out gradually in the primaries along their 
inner edges. Head, neck, and under parts plumbeous-ash (the latter less 
pure). Chin (fading out gradually into the ash of throat), sides of lower 
mandibles (separated from chin by a black line), and line from nostril to 
above eye, with middle of belly, dull white; eyelids pure white, the loral 
region dusky, the cheeks below the eye blackish. Tail black, excepting 
