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. BALLUS ELEGANS AUD., 



var. OBSOLETUS Ridg. 

 Califoriiiaii Rail. 



No. 470. A peculiar variety of the black rail is described from the 

 Parallones by Mr. Ridgway (Amer. Nat., viii, 1874, 111). 



470a. PORZANA JAMAICENSIS (GM.) CASS., 



var. COTURNICULUS Bd. 

 Pacific mack Rail. 



No. 472. The relationships of this form to the European &. chloropus 

 require further investigation. It will probably stand as 



472. GALLINULA CHLOROPUS LATH., 

 var. GALBATA (Licht.) Hartl. 



No. 479? Compare Key, p. 282. 



No. 489. A lighter colored form of dusky duck, with a buff throat, ie 

 described from Florida (by Mr. Ridgway, I. c.), where it is resident. 



489a. ANAS OBSCURA GM., 



var. FULVIGULA Ridg. 

 Floriclaii Ifcwskj Duck. 



No. 493? The query indicates probability of onl}* 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 th 

 first instance known of its occurrence in this country. 



[575bis.] HYDROCHELIDON LEUCOPTERA (MKIS.) Bora. 

 Wliite-wiiigred Black Tern. 



CHECK LIST BIRDS. 9* 



