176 
U S. P. R R. EXP. AND SURVEYS-ZOOLOGY—GENERAL REPORT. 
This species, though otherwise similar, is readily distinguished from T. verticalis and vociferans 
by the absence of the very dark brown, almost black, of the tail and its upper coverts, as well 
as by the pale external edges to all the tail feathers. The yellow is much brighter ; the chin 
and throat with more white, and the ashy tinge on the breast is much lighter than even in T. 
verticalis , and does not extend so far down. The inner surface of the wing is very pure yellow. 
The red in the crown has more of an orange shade. The bill is much larger and the tail much 
more deeply forked than in either of the species mentioned. The shafts of the tail feathers are 
white beneath, not brown. The differences from T. melancholicus will be found detailed under 
that species. 
A Tyrannus sulpliuraceus from Cuba and Hayti is indicated in Naumannia by Hartlaub, from 
the MSS. of Prince Paul, of Wiirtemberg, and subsequently referred to by Cabanis, in Journal 
fur Ornith. 1855, 479. The T. couchii, however, has no white stripe under the eye ; the crest 
is not golden yellow ; the tail feathers not pale yellowish beneath, &c. 
List of specimens. 
Catal. 
No. 
Sex. 
Locality. 
When collected. 
Whence obtained. 
Orig. 
No. 
Length. 
Stretch of 
wings. 
Wing. 
Remarks. 
4001 
J' 
Lt. D. N. Couch. 
99 
9.00 
15.00 
5.00 
feet black. 
4002 
March—, 1853 
111 
9.00 
15.00 
5.00 
4003 
3 
April —, 1853 
126 
9.50 
15.50 
5.00 
TYRANNUS MELANCHOLICUS, Vieillot. 
Tyrannus melancholicus, Vieillot, Nouv. Diet. N. H. XXXV, 1819, 84.— Tschcdi, Fauna Per. 1844-’46, 151.— 
Burm. Th. Bras. Vogel, 1856, 464. 
Muscicapa despotes, Licht. Verz. Doubl. 1823, No. 567, a. 
JMuscicapa furcata, Spix, Av. Bras. II tab. xix. 
Tyrannus crudelis, Swainson, Mon. Tyrant Shrikes Quart. Jour. XX, Jan. 1826, 275, (Brazil.) 
g P- Ch. _Bill very large. Quills moderately but abruptly emarginate and attenuated at the end ; the third and fourth longest; 
the first rather shorter than the sixth. Tail quite deeply forked, (depth of fork half an inch.) Top and sides of the head and 
neck light bluish ash ; rest of upper parts bright olive ; browner on the upper tail coverts. Chin whitish, passing gradually into 
pale ash (considerably lighter than above) on the throat, and on the fore part of breast tinged with olive green ; rest of 
lower parts bright gamboge yellow. Wing and tail feathers dark brown ; the tips of the primaries and tail almost black ; all, 
except the primaries, edged with olivaceous gray, which in the secondaries and tertials has a strong tinge of sulphur yellow ; 
edge of outer tail feathers pale brown, and narrow tips of all brownish white. Crown with a vermilion patch encircled by 
yellow. 
Length, 9.00 ; wing, 4.50 ; tail, 4.20. 
Ual> —Southern Mexico, Central and South America. 
I have described this species, although as yet not found near our territory, for the purpose of 
aiding in the determination of the species of this most difficult group, by showing the peculiar 
characteristics of some closely allied species. It has the general appearance of the three species 
just described, but the tail is much more deeply forked than in either verticalis or vociferans, 
although it is almost as black. It differs from both in the laxly fibred olivaceous outer edges 
to the tail feathers, instead of a compact uniform brownish black, without any colored margin. 
The ash color does not extend so far on the breast, which is more tinged with olive ; the yellow 
is more intense ; the light edgings of the wings are olivaceous, instead of grayish white. The 
bill is much larger ; the attenuation of the primaries less. In reality, however, nothing more 
