631 



is fully 7'65. Von Heuglin says that examples he has measured vary from 7*3 to 7 - 9 in length 

 of wing ; and there is in the British Museum a specimen from Egypt fully as large as the one 

 from Turkestan, the bird obtained in Heligoland being also similarly large, and in coloration 

 agreeing closely with the smallest of the Egyptian examples. I find also a variation in the pro- 

 portion of the primaries of the specimens I have examined — which shows that no character can 

 be based on these. 



The specimens figured are the pale form from Turkestan above described, and a dark speci- 

 men from Egypt, the latter being in the collection of Captain Shelley. 



In the preparation of the above article I have examined the following specimens : — 



E Mus. H. E. Dresser. 



a, 6 ■ Turkestan (Severtzoff, type of C. arenicolor). 



E Mus. G. E. Shelley, 

 a, 6 . Fayoom, Egypt, March 4th, 1871 (G. E. S.). b, d . Egypt, April 6th, 1870 (G. E. S.). 



E Mus. H. Seebohm. 

 a. Heligoland, June 22nd, 1875. 



