APPENDIX TO CHECK LIST. 137 



No. 450? For occasion of the query see Key, p. 2G7. 

 No. 4:GG. A pale form is described from California. See Ridgway 

 (Am. Nat., viii, 1874, 111). 



46Ga. BALLUS ELEGANS Aud., 

 var. OBSOLETUS Ridg. 

 Ci»lii'ornii&n Kiiil. 



No. 470. A peculiar variety of the Ijlack rail is described Irom the 

 B'aralloues by Mr. Ridgway (Amer. Nat., viii, 1874, 111). 



470a. PORZAWA JAMAICENSIS (Gm.) Cass., 

 var. coTUKNicuLUh Bd. 

 Pacific lIl»cE4 Rail. 



No. 472. The relatio!iship.sof this form to tlic European G. chloropus 

 require further investigation. It will probably stand as 



472. GALLIWULA CHLOROPUS Latu., 



var. (iALEATA (Licht.j llartl. 



No. 479? Compare Key, p. 282. 



No. 481). A lighter colored form of dusky duck, with a bull' throat, is 

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



48'Ja. ANAS OBSCURA Gm., 

 var. I'liLViGULA Ridg. 

 ff^lOB'ieliaia l&is.<>ili.y lliack. 



No. 493? The query indicates probal)ilitv of only varietal distinction 

 from No. 492. 



No. 501 ? The query indicates probability of only varietal distinction 

 from No. 500. 



No. o75bis. A specimen of the European white-winged tern. Hi/dro- 

 chelidoii leucoptera. was taken in Wisconsin, July 5, 1873, by Tli. Kum- 

 leiii, and presented to the Smithsonian by Dr. Brewer. This is the 

 tirst instance known of its occurrence in this country. 



[575bis.] HYDROCHELIDON LEUCOPTERA (Meis.) Boir, 

 liVliitc^wiiigred ltB»el& Tern. 

 Checic List Bikds. 9* 



