POLIOPTILA. 445 



Culicivora diimicola, UOth. Voy. Amer. Merid. p. 331 (1835-44) ; 



Hartl. Lid. Azam, p. 11 (1847) ; Grai/, Gen. B. i. p. 176 (1848) ; 



Burm. Bets. La Plata, St. ii. p. 473 (1861). 

 Culicivora boliviana, Scl. P. Z. S. 1852, p. 34, pi. 47. 

 Polioptila diimicola, Scl. P. Z. S. 1855, p. 12 ; id. Cat. Amer. B. p. 12 



(1862) ; Baird, Revieiu Amer. B. p. 73 (1864) ; Scl. 8,- Salv. P. Z. S. 



1868, p. 139 ; Gray, Hand-l. B. i. p. 237, no. 3438 (1869) ; Pelz. 



Orn. Bras. p. 70 (1871); Scl. ^ Salv. Nomencl. Av. Neotr. p. 4 



(1873) ; Hudson, P. Z. S. 1874, p. 158 ; Durnf. Lbis, 1876, p. 157, 



1877, p. 167 ; Scl. Sj- Salv. P. Z. S. 1879, p. 592 ; Salv. Ibis, 1880, 



p. 352 ; White, P. Z. S. 1882, p. 593. 

 Polioptila boliviaua, Gray, Hand-l. B. i. p. 237, no. 3435 (1869). 



Adult male. General colour above dark slaty blue, the head slightly 

 deeper than the back ; wing-coverts like the back, the bastard-wing 

 black, conspicuously edged with white ; primary-coverts and quills 

 edged externally with slaty grey, inclining to hoary white near the 

 ends of the secondaries ; upper tail-coverts and tail glossy black ; 

 the outer tail-feather white excepting a concealed base of black ; 

 penultimate feather black at base of outer web and obliquely black 

 across the inner web, the third feather white for the terminal fourth 

 and along the edge of the outer web ; base of forehead, lores, feathers 

 round the eye, sides of face, and ear-coverts black ; cheeks slaty 

 grey, separated from the black face by a line of white ; throat, breast, 

 and sides of body dark leaden grey, rather lighter on the abdomeu ; 

 the under tail-coverts whitish ; thighs leaden grey, hoary white an- 

 teriorly ; under wing-coverts and axillaries silvery grey, washed with 

 slaty blue, and clearer slaty blue along the edge of the wing; quills 

 blackish below, silvery white along the edge of the inner web : " bill, 

 legs, and iris black " {A. Feel). Total length 5"3 inches, culmen 0-45, 

 wing 2-05, tail 2"3, tarsus 0-7. 



Adult female. Differs from the male only in the facial markings, 

 the base of the forehead and lores being light bluish grey ; round 

 the eye a ring of white ; ear- coverts silvery white, with a broad 

 crescentic mark of black round their hinder margin. Total length 

 4*5 inches, culmen 0-5, wing 2-05, tail 2-25, tarsus 0-75. 



The Eolivian bird {P. boliviana) differs from P. dumicola in its 

 white belly and the conspicuous white on the malar line and throat, 

 the lower throat, breast, and flanks being light ashy grey, much 

 paler than in P. dumicola. Total length 4'8 inches, culmen 0"45, 

 wing 2-1, tail 2-2, tarsus 0-7. 



The type of Sclater's C. boliviana is somewhat intennediate between 

 some of the Bolivian specimens and P. dumicola, having a whiter 

 beUy than the latter, but having the throat and fore neck grey like 

 the breast. It is quite possible that it may be the winter plumage 

 of /-*. dumicola, which certainly extends to Bolivia, as one of Mr. 

 Bridges's specimens is indistinguishable from La-Plata birds. 



Hah. Southern Brazil and La Plata, ranging across to Bolivia. 



a. [ d ] ad. sk. Uniguav, Sept. 1877. Alan Peel, Esq. [C.]. 



b. 2 ail- sk. llio rU. la Plata. Srlater Collection. 



c. [$] ad. sk. Paysandu,Banda Oriental. Henry Durnford, Esq. [C.J, 



