8l6 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



appearing again by the middle of October. He found it apparently breed- 

 ing at Paso Flores and Rio Limay in December. 



Genus PROGNE Boie. 



Type. 



Progiie, Boie, Isis, 1826, p. 971 H. purpurea = H. subis. 



Geographical Range. — North, Middle and South America; the Antilles ; 

 the Galapagos. 



Progne furcata Baird. 



Prague furcata Baird, N. Am. Birds, p. 278 (1864). 



Description. — Adult male, P. U. O. C. 8985, La Plata, Argentina, 

 January, 1898. Total length, 7.75 inches ; wing, 5.40 ; culmen, .42 ; tail, 

 3.20 ; tarsus, .62. Uniform glossy purple above and below, wings and tail 

 dull black with slight glossy reflections, bill and feet black. 



Female similar above but duller, below dark gray with paler edgings 

 to the feathers, middle of the abdomen whitish. 



Geographical Range. — Chili and Paraguay through Argentina to Pata- 

 gonia (Chupat Valley). 



The Fork-tailed Martin does not invade, so far as known, the southern 

 portion of Patagonia, but is a characteristic form found as a migrant in the 

 Chupat Valley south to about 45° South Latitude. Here the birds arrive 

 in the spring and breed in December, retiring to the north again in the 

 early autumn. 



Mr. Peters found it rather locally distributed in western Rio Negro and 

 it was apparently nesting in rocky walls of a valley running from Puesto 

 Horno to Talagapa, December 21 (Bull. M. C. Z. Ixv, No. 9, p. 327). 



Genus PYGOCHELIDON Baird. 



Type. 



Pygochelidon Baird, t. c. p. 308 (1865) A. cyanoleuca. 



Geographical Range. — Central America from Guatemala southward 

 throughout South America as far south as Central Patagonia (Chupat 

 Valley). 



Pygochelidon patagonica patagonica d'Orbigny and Lafresnaye. 

 Hirundo patagonica d'Orbigny and Lafresnaye, Syn. Av. Mag. de Zool. 

 1837, P- ^9 (Patagonia). 



