TACHYOINETA. 



325 



Genus TACHYCINETA Oab. 



TacJit/cineta Cabanis, Mus. Hein. i. p. 48, 1850. Type ' T. thalassinus 

 (Swains.). 



Fig. 129. — To show the long under tail-coverts. 



In this genus the tail is short and only slightly emarginate, its 

 length is about four-ninths the length of the "wing, and the hind 

 toe and claw are superior in size to the outer toe and claw. Colo- 

 ration : male and female similar. 



555. Tachycineta albiventris. 



White-vented Tree-Swallow. 



Hirundo alliventris Bodd. Tabl. PL Enl. p. 32, 178.3 (Cayenne). 



Sirundo leucoptera Cab. in Sohomb. Reis. Guian. iii. p. 672, 1848. 



Tachycineta albiventris Salvin, Ibis, 1885, p. 205 (Bartica Grove, 

 Camacusa) ; Sharpe, Cat. B. Brit. Mus. x. pp. 113, 631, 1885 

 (Demerara) ; Beebe, Our Search ' for a Wilderness, pp. 247, 265, 

 378, 37%, 381, 1910 (Aremu Kiver, Abary Savannas); Brabourne & 

 Chubb, B. S. Amer. i. p. 326, no. 3327, 1912. 



? Tachycineta hicolor Beebe, Our Search for a Wilderness, p. 370, 1910 

 (Abary Savannas). 



Adult male. Head, back, wings, and tail glossy steel-blue, the 

 bases of the feathers on the back white ; greater upper wing- 

 coverts and secondary-quills broadly margined with white; rump 

 and upper tail-coverts with narrow black shaft-lines, some of the 

 long upper tail-coverts are steel-blue and others have an arrow 



