ART. 15 BIRDS COLLECTED IN" CENTRAL CHINA RILEY 11 



Family LARIDAE 



GTTLLS AND TERNS 

 40. LARUS ICHTHYAETUS Pallas 



Larus ichthyaetus Pallas, Reise Russ. Reichs, vol. 2, 1773, p. 713 (Caspian 

 Sea). 



One male and one female, southeast corner of Lake Kokonor, Au- 

 gust 14. 



Both of these specimens are immature, molting into the first win- 

 ter plumage. 



41. LARUS EIDIBUNDUS SIBIRICUS Buturlin 



Larus ridihundus sibiricus Butxtrlin, Mess. Orn., vol. 2, 1911, p. 66 (Kolyma 

 Delta). 



One adult male and one not quite fully adult female, 157 miles 

 west-northwest of Paotow, Inner Mongolia, April 11. 



42. LARUS BRUNNEICEPHALUS Jerdon 



Larus brunneicephalus Jerdon, Madras Journ. Lit. and Sci., vol. 12, 1840, 

 p. 225 (India). 



One immature female, southeast corner of Lake Kokonor, Tibet, 

 August 14. 



43. STERNA HIRUNDO TIBETANA Saunders 

 Sterna tibetana Saunders, Proc. Zool. Soc. London, 1876, p. 649 (Tibet). 



One male, 15 miles south-southwest of Ninghsia, Kansu, June 5; 

 two males and three females, Lanchow, Kansu, June 24-25 ; one male, 

 southeast corner of Lake Kokonor, Tibet, August 14. 



Two males in the United States National Museum from Ladak, 

 taken July 29 and September 11, are considerably darker on the 

 upper surface than any in the above series, and the Kansu specimens 

 may constitute another recognizable form from the arid interior 

 country, or they may possibly belong to the form named by Doctor 

 Sushkin, Sterna hirundo minussensis.^ 



44. CHLroONIAS LEUCOPAREIA SWINHOEI (Mathews) 



Hydrochelidon leucopareia swinJioei Mathews, Birds Austral., vol. 2, 1912, 

 p. 320 (Foochow, China). 



One male, 15 miles south-southwest of Ninghsia, Kansu, June 5. 



The series at my command is inadequate to properly determine the 

 form of the above specimen. It closely resembles in color two males 

 in the United States National Museum from Mindanao taken in May, 

 but has a slightly longer wing. The wing measures 230 mm. 



• List and distr. birds Russian Altai, 1925, p. 64. 



