the Lower Yangtse Basin. 509 



fresh waters of the interior/^ That it must pass through the 

 Yangtse basin on its way north is certain, but I believe none 

 winter so far north_, and though I liave kept a careful look 

 out, and have several times shot doubtful-lookiug L. ridi- 

 bundus in mistake for it, not a single specimen has come 

 under my notice. 



351. Sylochelidon caspia (Pall.). 



(755.) Large flights passed through Kiukiang in Sep- 

 tember, October, and November one year, but, as in the case 

 of most Terns, their visits are irregular. 



352. Hydrochelidon hybrida (Pall.). 



(757.) Abundant at Kiukiang one year in July and 

 August, 



353. Hydrochelidon leucoptera (Scliinz). 



(758.) Passes Kiukiang every May, sometimes in very 

 large flights. 



354. Sterna sinensis (Gm.). 



(762.) Passes through Kiukiang and Shanghai every 

 April and May, returning again in July and August with 

 y-oung birds. 



355. Sterna fluviatilis. 



(759.) 8. hirundo, L.; Swinhoe, P. Z. S. 1871, p. 422. 

 Passes and returns at the same dates as the last two, but is 

 less abundant. 



Order PYGOPODES. 

 Fam. CoLYMBiD^. 



356. COLYMBUS septentrionalis, L. 



(737.) I have seen two shot at Shanghai in February, and 

 a third is in the Museum. 



Fam. PoDiciPiD^. 



357. PODICEPS CRISTATUS (L.). 



(741.) Found on the river in winter, but scarce. 



