VIREO. 367 
again as a small yellowish spot above the posterior corner, seems 
quite peculiar. 
A specimen (male, June 16) from Mazatlan agrees closely in form 
with the present bird, although rather larger. The first quill is only 
a little more than half the second. The colors are duller, and the 
under parts paler; the white markings are less distinct, owing to the 
worn condition of the feathers. The extension of the range of the 
species from Southern Guatemala to Mazatlan is an interesting fact, 
paralleled by the facts in the case of Hirundo albilinea, various Tro- 
chilidx, etc., no specimens of which have hitherto been observed in 
the intermediate coast of Mexico. 
The type of the species described above has been kindly furnished 
by Mr. Salvin. 
Vireo semiflavus (the type of which I have before me from Mr. 
Salvin) I can hardly consider as distinct from ochraceus, as it re- 
sembles it very closely in 
size, form, and _ propor- 
tions. The first quill, in 
the type, is shorter than 
in ochraceus—being not 
quite half the second ; the 
other quills are as in V. 
ochraceus. The upper 
parts are rather brighter 
green ; the under parts lack the ochrey tinge, and the light markings 
on the wing are narrower. The same peculiarities of the eye stripe 
are seen in both types. The difference of coloration is what might 
be expectea between birds killed in January and in April, and the 
difference in length of outer quills such as is met with frequently in 
well established species. 
Vireo semifiavus. 
(No. 428.) Total length, 4.40; wing, 2.10; tail, 1.95; difference between 
10th and longest quills, .20; exposed portion of lst primary, .62, of 2d, 1.25, 
of longest, 5th and 6th (measured from exposed base of 1st primary), 1.60; 
length of bill from forehead, .54, from nostril, .50, along gape, .60; tarsus, 
78; middle toe and claw, .52, claw alone, .18; hind toe and claw, .44, claw 
alone, .20. 
A specimen from Merida, Yucatan (April), a locality nearly due 
north of Lake Peten, and closely related to the region of the latter 
in its zoological geography, agrees in general characters, but has the 
outer primary a little more than half the second, although not as 
long as in the type of ochraceus—about what it is in the Mazatlan 
specimen. The bill is darker and rather narrower. 
