portion is occupied by a narrow entrance. The eggs are pure white, five or six in 

 number, and are deposited in the wider part of the nest, which is lined with hair, wool, 

 and feathers. The young leave the nest about the middle of summer ; but in a single 

 instance we found, on the 20th of September, in Din-juan-in, close to the Ala-shan 

 Mountains, a nest with some unfledged young in it. 



" It arrives in S.E. Mongolia much later than Hirimdo gutturalis (i. e. about the 

 10th of May), although in the mountains of Kalgan we once observed it on the 23rd of 

 April. The first birds in Kan-su were seen on the 14th of May. The autumnal migra- 

 tion takes place in the early part of September ; and on the 12th of this month we saw 

 a large flock about the river Tetunga, which occupied about two hours in passing us. 

 In the Ussuri country we only once observed it." 



As regards the winter habitat of this Swallow we do not know much. Mr. Seebohm 

 says that it winters in Mongolia and Tibet, and we know that it goes to Assam and 

 Cachar. It may even be resident here, as Mr. Hume's specimens of H. intermedia from 

 Sadhyia, in Assam, were killed in June ; but these were probably early winter arrivals, 

 or laggards behind the main body of northward migrants. The type of H. substriolata 

 of Hume came from Cachar, and is undoubtedly R. daurica. A slight error occurs in 

 Mr. Oates's book, for he considers that " two specimens from Cachar, February (types of 

 Lillia substriolata, Hume)," belong to E. striolata ; but these cannot be the types of 

 L. substriolata, as they were shot in February 1879, whereas Mr. Hume's bird was 

 described in 1877. There was only one Cachar specimen in his collection at that date, 

 and consequently it must be the typical one, which we refer without hesitation to 

 S. daurica. 



The descriptions are taken from specimens in the British Museum, and the figure 

 is drawn from a Daurian specimen in Mr. Seebohm's collection. 



