TACHYCINRTA. 



325 



Genus TACHYCINETA Cab. 



Taclujn'nefn Cabanis, Mus. Hein. i. p. 48, ISoO. Tj^e T. tlialassiniis 

 (Swains.). 



/ 





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



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

 length is about four-ninths the length o£ tiie wing, and the hind 

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

 ration : male and female similar. 



555. Tachycineta albiventris. 



White-vexted Tree-Swallow. 



Hirumh albiventris Ijodd. Tahl. PI. Enl. p. 32, 1783 (Cayenne). 



Hirundo leucopfera Cab. in Selioml). llei.'^. Guiaii. iii. p. G72, 18-48. 



Tachycincia albiventris Salvin, Ibis, 1885, p. 20o ( Bartica Grove, 

 Caraacusa) ; Sharpe, Cat. B. Brit. Mus. x. i)p. 113, 031, 1885 

 (Demerara j ; Beebe, Our Search for a Wilderness, pp. 217, 265, 

 378, 379, 381, 1910 (Areniu lliver. Abarv Savannas); Brabourne & 

 Chubb, J3. S. Aiuer. i. p. 320, no. 3327,'l9l2. 



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

 (Abary Savannas). 



Adult maU. Head, back, wing«, and tail glossy steel-blue, the 

 bases of the leathers on the back white; greater upjjer wing- 

 coverts and secondary-quills broadly margined with white; rump 

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

 lout'' u})per tail-coverts are sti'cl-ljlue and others have an arrow 



