BIRDS TYRANNINAE MYIARCHUS MEXICANUS. 179 
List, of specimens. 
Catal. 
No. 
Localit 
oca l y. 
When col- 
lected. 
Whence obtained. 
Orig'l 
No. 
Collected by — 
Length. 
Stretch 
of wings. 
13 66 
13.50 
13.16 
13.50 
13.41 
13.25 
Wing. 
4.25 
4.25 
4.25 
4.25 
4.00 
4.08 
1449 
1523 
2634 
2539 
1020 
1426 
7414 
6970 
7532 
8398 
7201 
7202 
3 
3 
3 
S 
3 
Q 
May 4, 1844 
May 16, 1844 
May 11, 1846 
May 5, 1844 
May 24, 1843 
May 2, 1844 
8.75 
9.00 
9.00 
9.00 
8.0b 
8.75 


Q 
3 
May 11, 1844 
May 8, 1857 
33 
8.25 
8.60 
12.50 
12.70 
4.00 
4.10 
3 
July 1, 1857 
108 
MYIARCHUS MEXICANUS, Baird. 
Ash-throated Flycatcher 
Tyrannula mexicana, Kaup, Pr. Zool. Soc. Feb. 1851, 51. 
Tyrannula cinerascens, Lawrence, Annals N. Y. Lyc. N. Hist. V, Sept. 1851, 109. 
Sp. Ch. — Bill black, the width opposite the nostrils not half the length of culmen. Head crested. Tail even, the lateral 
feathers slightly shorter. Secand, third, and fourth quills longest ; first rather shorter than the seventh. Above dull greyish 
olive ; the centres of the feathers rather darker ; the crown, rump, and upper tail coverts tinged with brownish. The forehead 
and sides of the head and neck grayish ash ; the chin, throat, and fore part of the breast ashy white ; the middle of the breast 
white ; the rest of the under parts very pale sulphur yellow ; wings and tail brown. Two bands across the wing, with outer 
edges of secondaries and tertials dull white ; the outer edges of the primaries light chestnut brown (except towards the tip and 
on the outer feather ;) the inner edges tinged with the same. Whole of middle tail feathers, with the outer webs (only) and 
the ends of the others brown ; the rest of the inner webs reddish chestnut, the outer web of exterior feather yellowish white. 
Legs and bill black ; lower mandible brownish at the base. Length about 8 inches ; wing, 4 : tail, 4.10 ; tarsus, .90. 
Hab. — Coast of California, and across by valley of Gila and Rio Grande to northeastern Mexico. Seen as far north in Texas 
as San Antonio. 
In a young specimen the crown is more tinged with brown ; the upper tail coverts and the 
middle tail feathers are chestnut, and, in fact, all the tail feathers are of this color, except alonsj 
both sides of the shaft on the central feathers, and along its outer side in the lateral ones. 
The relationships of this species are clearly with M. crinitus, although the differences are 
readily appreciable. The size is much the same ; the bill narrower and blacker ; the tarsi much 
longer ; the wings not so much pointed. The colors of the upper parts are quite the same ; 
beneath, however, the throat and middle of the fore breast are nearly white (quite white behind) 
instead of ash, and the sulphur yellow of the remaining under parts is exceedingly pale, instead 
of very intense. The wings are similar, but the chestnut brown of the inner web is deeper and 
more abruptly denned in crinitus. In the lateral tail feathers of mexicanus the brown does 
not cross the shaft from the outer webs, but is continued rather broadly round the tips ; while 
in the other the inner side of the shaft is bordered by brown, but the inner web is chesnut to 
the extreme end. 
This species is but briefly described by Kaup, as quoted above, still his comparisons of size, 
&c, with its allies leave no doubt as to the identity with Tyrannula cinerascens of Lawrence. A 
Mexican specimen is a little larger than usual, but otherwise the same. 
