E. LÖNNBERG, BIRDS FROM TRANSBAICALIA AND MONGOLIA. 31 



broader than those found in these' specimens and therefore 

 it is suitable to retain the subspecific name even if in some 

 instances the difference is very slight and intermediate stages 

 can be found, as of ten is the cases with geographic subspecies. 

 The hepatic form is paler cinnamon than Swedish speci- 

 mens of the corresponding variety. 



Coluiuba rupestris (Pallas). 



Kjachta ö' (n:o 81) ^"A 1908. 



This specimen is by far not so påle, especially not below, 

 as specimens from Tian Shan which belong to the subspecies. 

 pallida Rotsch. & Hart. 



Hydrochelidon leucoptera (Meissner & Schtnz). 



Orchon ef (n:o 78) ''Vö 1908. Dschargutscheji Lake ef, ?, 9'^& (n:o 72, 76, 

 77, 79, 92) 23/5 1908. 



The length af the wing (measured without straightening) 

 is in the males resp. 215, 212 and 208 mm., in the females 

 resp. 196, 206 and 194 mm. In n:o 78 the tips of some tail- 

 feathers and in n:o 79 the greater visible part of the tail is 

 pearl grey, in the others the whole tail is pure white. 



Sterna loiigipennis Nordmann. 



Kiran ef (n:o 68) -^k 1908. Kudara ef (n:o 69) ^o 1908, Bura (f (n:o 85) 



-75 1908. 



Wing 262 — 280. This tern has been, reported from Ar- 

 gun river, but the localities mentioned above appear to ex- 

 tend its boundarv further west than was known before. 



Larus cacliinnaiis Pallas. 



Kossogol Lake cT (n:o 1) ^e 1908. 



Middle toe and claw 58, tarsus 64 mm. 

 .Egiatilis dubia (Scopoli). 



Burgatai ef (n:o Hl) ^"/r 1908. 



Yaiiellus vaiiellus (Linnjeus). 



Kiran $ (n:o 87) ^^5 1908. Kudara ef (n:o 88) ^c 1908. 



