( 326 ) 



There is no iliffereuce iu colour between the sexes, the females being only ii 

 little smaller: dS, wing 70—72; tail 47—49 mm.; ??, wing 65—67; tail 

 42 — 44 mm. From C. uniformis it differs chiefly in its much smaller size and in 

 having the axillaries greenish grey instead of yellowish white. 



The various forms of C///oro/>ipo can be distinguished by the following key : — 



A. Plumage glossy black, axillaries and a large tuft of 



silky feathers on the sides of the breast snow-white C. unicolor <?. 



B. No black whatever in the plumage. 



«'. Top of the head bright yellow, breast and abdomen 



jialer yellow G._flavicapilla S ? . 



a-. Head green like the back. 



i'. Axillaries and a large tuft of silky feathers 



on the sides of the breast pure white . . C unicolor ? . 

 b-. No white tuft on the sides of the breast ; 

 axillaries not white, 

 c'. Larger (wing 78 — SO ; tail 55 — 58 mm.) ; 

 axillaries pale yellowish, greyish in 



the middle C uniformis <? ? . 



C-. Smaller (wing 65 — 72 ; tail 42 — 49 mm.); 

 axillaries greyish green 

 r/'. Upper surface bright grass-green . C. h. holocklora 6 f . 

 fP. Ujiper surface {)ale olivaceous green C. h. litae <S ? . 



25. Muscicapa luteocephala Less, should be Heterocercus luteocephalus (Less.). 



Muscicapa lutrocrphala Lesson, Traife d'Oni. (1831), p. 392 [no locality]; Pucheran, Arch. 

 Mils. Paris, vii. (1855), p. 374 [crit. — "rAmerique meridionale "]. 



MiTs. Paris.— etiq. : " Moucherolle, Amerique meridionale." On the bottom of 

 the stand I find the following notes iu Pucherau's handwriting : " Muscicapa 

 luteocephala Lesson (type) de I'Amc'rique meridionale." Wing 7U ; tail (moulting) 

 44 ; bill 111 ; graduation of tail 25 mm. 



This is a very distinct species oi Heterocercus, agreeing in the form of the bill 

 and in the peculiar shape of the tail with the other species, from which, however, it 

 is easily recognisable liy its widely different coloration. That of the uuder-parts 

 reminds one of Seotothorus chrysoccphalus (Pelz.) [= igniceps Scl.] 



Upper surfiice jiale olive-green ; top of the head and uajie ashy grey, middle 

 of the crown briglit Icmon-yclIow ; lores whitish, cheeks and ear-coverts pale 

 olive greenish. Throat and chest dirty whitish, the latter with a slight brownish 

 hue ; rest of under-surface very jjale suljihur yellowish. Upjier wing-coverts, quills 

 and tail-feathers dark brown, exteriorly edged with olive-greeuish. Bill pale 

 brownish, lower mandible almost whitish. 



As will be seen from the above description, it differs from the other known 

 species in having the forehead and sides of the crown ashy grey, and the posterior 

 l)arts of the lower surface pale sulphur yellow. In structure it agrees perfectly with 

 ll.Jlnvixcvtcx Pelz. The tarsi are short and slender, the bill of exactly the same 

 form, and the tail, although not full-grown, shows the characteristic reduction of the 

 onter rcctrices, the outermost pair being short, attenuated, and entirely hidden by 

 the under tail-coverts. The middle pair has not yet reached its full length, hence 

 the tail ajjpears shorter than in the allied species. 



