1S2 BIRDS OF BRITISH GUIANA. 



abdomen and under tail-coverts yellow; under wing-coverts and 

 inner edges of quills below pale sulphur-yellow, remainder oE 

 quill-lining dark brown ; lower aspect of tail brown edged with 

 yellow at the tip. 



Total length 92 mm., exposed cnlmen 7, wing 50, tail 40, 

 tarsus 13. 



The bird described was collected at Bartica in 1912. 



Breeding-season. Unknown in British Guiana. 



Kest. Unrecorded in British Guiana. 



Eggs. Undescribed from British Guiana. 



Range in British Guiana. Bartica (McConnell collection'); 

 Bartica (WJdteli/). 



Extralimital Range. Cayenne {Latham) ; North-east Brazil, 

 Eastern Peru, Colombia. 



Habits. Unrecorded in British Guiana. 



Genus TYRANNISCUS C^ab. & Hein. 



Tyranniscits Cabanis & Heine, Mus. Hejii. ii. p. 57, 1859. Type 

 T. nigricapillus (Lafr.). 



Fig. 78. — Tyranniscus nigrioapillus. 



The members of this genus are likewise small birds, but there 

 is no crest and the crown is uniform. The bill is flattened, the 

 wiilth at the base being about equal to half the length of the exposed 

 culmen. The wing is rounded, the second, third, and fourth 

 primaries longest and equal, the first about equal in length to the 

 sixth. Tail square at the tip and about five-sixths the length of 

 the wing. Tarsiis about twice the length of the exposed culmen. 

 The hind toe and claw are about equal in length to the middle toe 

 and claw. Coloration : male and female similar. 



Key to the Species. 



A. Throat yellow like the breast T. gracilipes, p. 183. 



B. Throat white in contrast to the breast T. acer, p. 183. 



