388 Dr. E. Coues on Central-American Laridse. 
LARINiE. 
1. Blasipus heermanni, Bp., ex Cass. 
A very young female. It is entirely fuliginous, with no 
signs of the white head or of the general plumbeous hue of the 
adults. The bill flesh-coloured, its terminal third black; the 
feet black; the worn wing-coverts, tertials, and tips of the 
wings and tail greyish brown. 
a. Young 5; Chiapam, Pacific coast of Guatemala, January 
1863; (and several other specimens in similar plumage.—0. S.) 
2. Chroicocephalus cucullatus, Bruch, ex Licht. 
A single immature specimen, identical with the numerous 
North American examples which have been identified with the 
Larus cucullatus of Professor Lichtenstein by both Mr. Lawrence 
and myself. There is an incomplete hood; the front and 
cheeks are mostly white; the bill and feet blackish; none of 
the characteristic markings of the primaries as yet apparent. 
a. Chiapam, Guatemala, January 1863. 
3. Chroicocephalus atricilla, Linn.: Coues, Proc. Acad. 
Nat. Sc. Philad. 1862, p. 309. 
We have specimens from both coasts,—those from the Atlantic 
in summer plumage, perfectly or partially assumed; those from 
Chiapam, on the Pacific, in winter or immature dress. The 
latter have the tarsus slightly longer, and the bill somewhat 
stronger, than the former; but these characters, showing varia¬ 
tion between individuals from the same locality, are of insufficient 
value to make any separation of the species justifiable.—0. S. 
STERNINiE. 
4. Thalasseus REGIUS, Gambel. 
The numerous examples of both adult and young are quijte 
identical with the common North American bird. 
«, b. Chiapam, January 1863; c, cl British Honduras, May 
1862 (a. adult ; b } c,d. immature); (and several other speci¬ 
mens.—O. S.) 
Haliplana fuliginosa , and Anous stolidus. These, in order to render Dr. 
Coues s notes perfect as far as our collection is concerned, I have ventured 
to incorporate into his paper. — O. S. 
