100 Brewster on the Black- Capped Vireo. 
males, were obtained by Dr. Woodhouse on the 26th of May, 1851, 
near the source of the Rio San Pedro in Southwestern Texas. About 
three years later a third, also a male, was shot in the same locality 
by Mr, J. H. Clark, one of the naturalists of the Mexican Boundary 
Commission. Still a fourth, probably a female,* the date of whose 
capture has not been recorded, was taken at Mazatlan, Mexico, by 
Colonel A. J. Grayson. Upon these data alone our knowledge of 
the species lias until very recently rested, and the Black-capped 
Vireo, with Baird’s and Leconte’s Buntings, and several other birds, 
seemed in a fair way to be assigned a permanent place among the 
lost species. In this Bulletin for January, 1879, however, Mr. 
Deane brought the species once more to the front by an interesting 
announcement of the capture of three Texas specimens, which were 
taken by Messrs. George H. Ragsdale and W. Norris in April and 
May, 1878. Shortly after the appearance of Mr. Deane’s note on 
this species, Mr. Edmund Ricksecker of Nazareth, Penn., wrote 
me that he had received two sets of the eggs of the Black-capped 
Vireo, which he felt sure were correctly identified, and that a friend, 
Mr. W. IT. Werner of South Bethlehem, Penn., had still a third set, 
together with the nest and both parent birds. Knowing well from 
past experience Mr. Ricksecker’s thorough reliability in such mat- 
ters, I at once obtained from him one of these sets, which, with the 
nest, is now in my collection, and will presently be considered in 
detail. In reply to my further inquiries, Mr. Ricksecker informed 
me that all these nests had been collected in Comal County, Texas, 
in May, 1878, by Mr. Werner and a gentleman with whom he was 
at the time staying, and who, during a residence of several years in 
Texas, has collected for Mr. Ricksecker many rare eggs and nests. 
The latter’s name I am for obvious reasons requested to withhold. 
Mr. Ricksecker, however, very kindly put me in communication 
with Mr. Werner, who has answered all my inquiries in a very full 
and satisfactory manner, leaving no doubts in my mind as to the 
correct identification of these Vireo’s nests. 
I am also indebted to him for the following interesting account 
* Since the above article was written I have examined all Mr. Werner’s speci- 
mens of the Black-capped Vireo, and find that there is no obvious difference be- 
tween the sexes. Several females, whose sex was determined by careful dissec- 
tion, have the head-markings as dark and strongly defined as the males. Mr. 
Ridgway informs me that he is now doubtful whether the Mazatlan specimen 
realty belongs to this species. 
