petrochelidon albif rons melanogaster S'.vainson 

 Petrochelidon swain soni Scl. Type 



No. 58. 9. 27.1- Collection. B. LI. , Wing 103, Tail 

 A7, o T^pe of swainsoni Scl. June 1857. 

 Locality Oxaca. 



Plumage abraded probably = 105 or more 

 if fresh. Forehead and throat dark like Mexican 

 birds in general. 



A. J. Van Rossem 



