146 SOME CHINESE VERTEBRATES. 



COLYMBIDAE. 

 COLYMBUS CRISTATUS Linn<3. 



One male, in winter plumage, Chachianghsien, western Szechwan, Decem- 

 ber 7, 1908. 



TACHYBAPTUS RUFICOLLIS POGGEI (Reichenow). 



Two adult females, Ichang, Hupeh, September, and October. 



The collection of the Museum of Comparative Zoology contains also two 

 fine adults, <? and 9 , from Pekin. These specimens indicate that the slight 

 characters that distinguish the Chinese form from true T. ruficollis (Pallas) 

 and T. r. philippensis (Bonnaterre) are not wholly constant, and the subspecies 

 is certainly not a strongly marked one. 



LARIDAE. 



STERNA SINENSIS Gmelin. 



Seven specimens, adults of both sexes, Luchow, and Kiating, Szechwan, 

 April, and May. 



LARUS RIDIBUNDUS Linne". 



Four specimens, three adults of both sexes in winter plumage and one 

 immature female, Ichang, and Changhsien, Hupeh, February, and March. 



LARUS AFFINIS Reinhardt. 



One female, immature, in probably its second year, Chachianghsien, western 

 Szechwan, December 7, 1908. 



LARUS CANUS Linne". 

 One immature female, Yachow, western Szechwan, December 5, 1908. 



CHARADRIIDAE. 



MICROSARCOPS CINEREUS (Blyth). 



Three specimens, two adult females and a youngish male, Ichang, Hupeh, 

 March, and October. 



VANELLUS VANELLUS (Linne 1 ). 



Five specimens, both sexes, Ichang, Hupeh and Chiachianghsien, Kiating, 

 Kungyahsien, and Omeihsien, Szechwan, autumn, and winter. 



