156 DAVENPORT ACADEMY OF SCIENCES. 



migrant" (Currier and Praeger). Liini — (Bailey). Pottawattamie 

 — MilLs — "common migrant" (Trostler). Poweshiek — "rare tran- 

 .sient" (Kelse}'). Webster — "frequent migrant" (Somes). Wood- 

 l)ury — "uncommon transient" (Rich); a female specimen in the 

 University museum, taken at Sioux City, May 6" (Anderson). 



15. (60). Larus Philadelphia (Ord). Bonaparte Gull. 



The Bonaparte Gull is one of the most widely dispersed species 

 in North America. Breeding chiefl}- in high latitudes, it onh- 

 reaches Iowa during the migrations. It is not usually as common 

 as the Franklin Gull. Dr. B. H. Bailey has a female specimen 

 taken April 30, 1902, on a slough near Cedar Rapids. Dr. Trost- 

 ler gives it as a conmion migrant in Pottawattamie and Mills, 

 seen in very large flocks in autumn and smaller flocks in spring. 

 Recorded from Linn as a "rare migrant" (Baile}^); Jackson — "tol- 

 erably common transient" (Giddings); Kossuth — "transient" 

 (Bingaman). 



Genus Xema Leach. 



16. (62). Xcma sabiiiii (Sab.). Sabine Gull. 



Only two specimens of this species have been recorded as cap- 

 tured in Iowa. Dr. Paul Bartsch (Auk, xvi, 1899, 86), says: "My 

 collection of Iowa birds contains two immature specimens of 

 Sabine's Gull, l)Oth of which were taken on the sandbar innnedi- 

 ately above Burlington, Iowa. No. 50 (S. U. I. No. 1598 1) male, 

 was shot Oct. 15, 1891; No. 51 (S. U. I. No. 15982) female, Oct. 

 12, 1894. These I believe are the first records of this species for 

 Iowa. The .specimens are deposited at the State University at 

 Iowa City." 



Subfamily STERNIN^. Terns. 

 Genus Sterna Linnaeus. 

 Subgenus Thalasseus Boie. 



17. (64). S/oiia caspid Pallas. Caspian Tern. 



The Caspian Tern appears to be a tolerably common but some- 

 what irregular migrant in Iowa, frequently appearing in consid- 

 erable numbers. The species was listed by Allen (1870), and 

 Cooke (Bird Migr. in Miss. Val. 1884-5, 57, ) states that Mr. J. 

 W. Preston has taken it in central Iowa. Prof. C. C. Nutting 



