APPENDIX TO CHECK LIST. 137 
No. 450? For occasion of the query see Key, p. 267. 
No. 466. A pale form is described from California. See Ridgway 
(Am. Nat., viii, 1874, 111). 
466a. RALLUS ELEGANS Aovbp., 
var. OBSOLETUS Ridg. 
Californian Bail. 
No. 470. A peculiar variety of the black rail is described from the 
Farallones by Mr. Ridgway (Amer. Nat., viii, 1874, 111). 
470a. PORZANA JAMAICENSIS (Gm.) Cass., 
var. COTURNICULUS Bd. 
Pacific Blach Rail. 
No. 472. The relationships of this form to the European G. chloropus 
require further investigation. It will probably stand as 
472. GALLINULA CHLOROPUS Larn., 
var. GALEATA (Licht.:) Hartl. 
No. 479? Compare Key, p. 282. 
No. 489. A lighter colored form of dusky duck, with a buff throat, is 
described from Florida (by Mr. Ridgway, J. c.), where it is resident. 
4892. ANAS OBSCURA Gm., 
var. FULVIGULA Ridg. 
Floridan Dusky Dueck. 
No. 493? The query indicates probability of only varietal distinction 
from No. 492. 
No. 501? The query indicates probability of only varietal distinction 
from No. 500. 
No. 575bis. A specimen of the European white-winged tern, Hydro- 
chelidon leucoptera, was taken in Wisconsin, July 5, 1873, by Th. Kum- 
lein, and presented to the Smithsonian by Dr. Brewer. This is the 
first instance known of its occurrence in this country. 
(575bis.]} HYDROCHELIDON LEUCOPTERA (Mets.) Bor. 
White-winged Biack Tern. 
CHECK List BIRDS. 9* 
