BIRDS TYRANNINAE — MYIARCHUS LA WRENCH. 
181 
although the tarsi are the same length. The most striking feature is found in the continuation 
of the rufous boundary line on the inner webs of the tail feathers in a straight line to the 
extreme tip of the tail, instead of having this to curve abruptly to the inner edge of the feather, 
leaving the entire tips brown. 
A specimen of this bird, labelled Tyrannula crinita, (to which, indeed, it bears a close resem- 
blance,) was received from Mr. Verreaux. It is probably the species described by Kaup as 
Tyrannula cooperi, though widely different from the real bird. As, however, the two fall in 
different genera, and, especially, as the name of cooperi cannot stand for the other species, I 
very gladly retain it for the present one. 
In all three species the outer primaries are without any rufous, thus distinguishing them 
from M. gossii, which has rufous edging to all the primaries. M. stolidus has the black stripe 
on the inside of the shafts of the tail feathers reaching only to the middle of the feathers. 
I am under the impression that Kaup is not the first to apply the name of cooperi to the 
present species, and that it is also found in Chile. It is probable that the real olive-sided 
flycatcher (T. cooperi, Nuttall,) has not been found in South America. 
List of specimens. 
Catalogue number. 
Locality. 
Whence obtained. 
Original number. 
9100 
M. Verreaux 
29827 
MYIARCHUS LA WRENCH, Baird. 
Lawrence's Flycatcher. 
Tyrannula lawrencii, Giraud, Sixteen Sp. Texas Birds, 1841, pi. ii. 
Sr. Ch. — First quill shorter than the secondaries. Female — Above olive green; lightest on the rump ; the head dusky. 
Throat pale ash ; rest of under parts sulphur yellow. Quills and tail feathers brown, edged externally with brownish rufous ; 
internally witli paler rufous. Rill dark brown ; feet black. Length, (female) 7 inches ; wing, 3.25 ; tail, 3.50. 
Hab. — Northeastern Mexico to the Rio Grande. 
In this species the wing is short and considerably rounded ; the first quill shorter than the 
secondaries ; the second intermediate between fifth and sixth. The tail is slightly emarginated. 
There is a wash of rufous on the wing coverts, especially on their edges, but there are no dis- 
tinct bands. There is a faint trace of rufous only on the outer first primary, and but little 
more on the second ; it is distinct on the outer edges of all the other quills, but turns to yellowish 
on the innermost ones. The light reddish buff of the inner webs is much more extended 
than externally, where the rufous is confined to the extreme edge of the web. The tail feathers 
are, for the most part, olive brown ; the edges only rufous, tills color only extending to near the 
tip ; internally it occupies about one third of the inner vane ; externally it is a mere border. 
The outer web of the outer feather is paler than in the rest, but not at all white. 
This rare flycatcher is similar in general characters to the M. crinitus and mexicanus, but 
readily distinguishable by strongly marked characters. The size is less, and the first primary 
shorter than the secondaries instead of longer. The shades of coloration are those of crinitus ; 
much darker than in mexicanus. It lacks the two white bands of the wings, and the broad 
sulphur yellow edgings to the innermost quills. All the tail feathers are brown on both webs 
