On new Forms of South' American Birds. 303 



XXX. — New Forms of South- American Birds. By 

 Charles Chubb, F.Z.S., M.B.O.U., Zoological Depart- 

 ment, British Museum (Natural History). 



(Published by permission of the Trustees of the British Museum.) 



Perissotriccus ecaudatus miser abilts, subsp. n. 



Adult. Differs from P. ecaudatus ecaudatus ( J'Orb. & Laf r.) 

 in being darker green on the back, darker grey on the crown 

 of the head and sides of face, and inclining to grey on the 

 under surface. It differs also in having the lower mandible 

 black and the feet much darker than in the Bolivian bird. 



Total length 58 mm., exposed culmen 11, wing 34, tail 12, 

 tarsus 13. 



Hob. British Guiana. 



The type, which is in the McConnell Collection, was 

 collected on the Bonasika River in 1911. 



Atalotriccus griseiceps whitelyanus, subsp. n. 



Adult male. Allied to A. griseiceps griseiceps (Hellm.), 

 but differs in having the back uniform green. 



Total length 97 mm., exposed culmen 10, wing 42, tail 36, 

 tarsus 16. 



Adult female. Similar to the adult male, but smaller. 



Wing 38 mm., tail 28. 



Hab. British Guiana. 



The male and female types are in the British Museum, and 

 were collected by the late Henry Whitely, Jun., at Quonga in 

 October and November 1887, Salvin-Godman Collection. 



The species that has hitherto been known to authors and 

 usually classified under the title Mionectes oleagineus differ 

 so much from the various localities in its distribution, by the 

 paler or darker plumages, as to be easily separable into 

 subspecific forms. I propose, therefore, that the following be 

 recognized : — 



P ipromorpha oleaginea wallaeei, subsp. n. 



There are three examples from the Amazon Valley, two 

 from Para and one from the Rio Negro, which are similar 

 but paler green than P. o. oleaginea on the upper surface, and 



Ann. & Mag. N. Hist. Ser. 9. Vol. iv. 22 



