ROCK SWALLOW. 103 



the mountains of Auvergne, and Dauphine", and 

 Gibraltar : it arrives at the former place in the 

 middle of April, and retires the middle of August. 



ROCK SWALLOW. 

 (Hirundo rupestris.) 



Hi. murina subtus albida, remigibus caudaque nigricantibus, rec- 



tricibus latere interiore macula ovali alba. 

 Mouse-coloured Swallow, beneath whitish, with the quills and 



tail dusky, the lateral tail-feathers with an oval \vhite spot on 



the inner web. 

 Hirundo rupestris. Gmel.Syst.Nat. 1. 1019- Lath. Ind. Orn. 



2.576. 11. 

 Rock Swallow. Lath. Gen. Syn. 4. 56g. 11. 



SIZE of the Ambergris Swallow : length about 

 five inches and a half: beak black : upper parts 

 of the plumage the same as the Sand Martin, of a 

 pale mouse-colour : the wings and tail darkest ; 

 the latter very slightly forked, and each feather 

 with a white spot on the inner web : under parts 

 of the body whitish : legs black, not feathered : 

 builds in the cavities of rocks a nest of mud and 

 clay j and inhabits Carniola. 



