158 THE BIRDS OF MONGOLIA ETC. 



till the 20th of July. In this month, however, they make less noise, and do 

 so only late in the evenings and early in the mornings. 



26. Caprimulgus plumipes, n. sp. 



Fulvo-isabellinus nigro striatus et vermiculatus ; alarum primariis fasciis latis transversis rufis 

 notatis, tectricibns alarum lunulis numerosis isabellinis signatis, subalaribus pallide rufis; 

 crisso subcaudalibusque isabellinis immaculatis ; tarsis totis vestitis. 



We met with this species only once, and then in the tamarisk -bushes at 

 the northern bend of the Yellow River, obtaining a single specimen (young 

 female ?), w^hich, by its general colour, approaches Caprimulgus arenicolor, Sev.*, 

 from Turkestan, and C. isabellinus, Temm., but differs from both these species 

 by having long black streaks all over the head and the upper parts of the 

 body similar to those of (7. europcEUs ; these streaks, however, are narrower 

 and not so numerous. Again, our species has thirteen cross bars on its tail, 

 whilst C. arenicolor, Sev., has only eleven. The primaries are marked on the 

 outer as well as on the inner webs with large reddish brown spots ; the upper 

 wing-coverts are spotted at the ends with pale yellow ; the back portion of 

 the stomach and the under tail-feathers are pale yellow, without any markings; 

 the tarsus is feathered down to the toes. Measurements of our specimen- 

 length 10"-5, width 2r'8, wing 7"-5, tail 5"-2, gape l", tarsus 0"-5, middle 

 toe (without the serrated edge) 0"-66. Quills, longest 2>1>3. Culmen 

 black ; legs dark brown ; iris brown. We did not see this bird anywhere, 

 except in the Hoang-ho valley. 



27. Cypselus apus, L. Strish hashenney. 



Cypselus apus is tolerably common throughout Mongolia, and breeds 

 there on the clay walls of the houses or in earth banks. In Kan-su it is very 

 scarce, and w^e observed a few specimens (which most probably were breeding) 

 in the alpine circle of the mxOuntains. 



^ [r/. Ibis, Oct. 1875, 3rd ser. vol. v. p. 491, ''falso C. isabellinus , Sev., nee Temm.''— 

 Editor of O. M.] 



