( 54 ) 

 188. Machaeropterus pyrocephalus (Scl.j. 



Pipra pyrocephala Scl., Ret: <t Mii</. Zonl. 1852 p. 9 (Hab. loc. ignota — we substitute Upper 

 Amazons, Ucayali). 



Lii Pricion, ('aura River: cJ c? ad. 13, l.j. xii. 1900. " Irides reddish, upper 

 mandible blackish brown, lower jiale brown, feet very pale brown" (E. Andrd). 



189. Scotothorus amazonum (.Scl.>. 



Heteropehna amazonum, Scl., P.Z.S. 1860 p. 466 (typ. ex Chamicuros, Huallaga). 



Nerieagua: "? ?" 23. iii. 7. iv. '99 (nos. 12224, 12407). 



Mnndnaiio : c?c? 4, 12. iii. '09 ; ? 20. ii. '99. 



(Nos. 12U30, 12176, 1219() Cherrie coll.) 



"Iris seal, feet slate-grev, bill dusky lilackish, paler at base of mandible, feet 

 greenish olive-grey." 



Hartert lias corajiared the type s])eeimens in the British Museum, and found 

 that they had the outer aspect of the wings, the tail and rump a shade more 

 reddish brown, but he does not consider the evidence of so few skins sufficient for 

 separation. 



189a. Scotothorus wallacei (Scl. & Salv.). 



Heteropelma icallacii Scl. & Salv., I'.Z.S, ISl'iT pp. o79, 595 (Lower Amazons — typ. ex Pari in 

 Brit. Mu9.). 



Nicare, Caura R. : January isth, 1901 (E. Andre). "Iris black; bill black; 

 feet dark bine-grey." 



La Pricion, ('aura R. : February 17th, 1901 (E. Andre). 



Both these birds are marked " ? ," bnt one being mnch larger is probably a male. 



The two specimens from the Caura River agree fully with the specimens of 

 H. wallacei in the British Museum. They lack the reddish throat and crown of 

 //. amazonum. 



(The generic name Heteropelma Bp. 1S54 is preoccupied by Heteropelma Wesm. 

 1849. Of Oder/i. Proc. Philad. Ac. 1899, p. 208.) 



190. Heterocercus flavivertex Pek. 



Heterocercusfliivlivrle.r Pel/,., Zur. (Ini. lims. (187U) pp. 1'2D, 18G (ex Rio Negro, etc.). 



Maipnres : <? c? ad. 12, 18, 20. xii. '98 ; ? ? 13, 17, 22, 24, 29. ,xii. '98. 



Perico: ? ? 20. xi., cJ juv. 23. ix. '98 ; J ad. 22. ix. " Iris seal, feet slate, 

 bill black, slate at base of mandible." 



(Nos. 11194, 11211, 11285, 11280, 11396, 11448, 11449, 11458, 11492, 11510, 

 11511, 11520, 11579, 11594, 11595, 11012, 11045 Cherrie coll.) 



The young male is perfectly like the female, only the wing is 2 mm. longer. 



The Maipnres birds do not diifer materially from typical specimens collected 

 by Natterer on tlie Rio Nigro and the Rio Vaupe, with which we have compared 

 them. Our skins are generally a little lighter green on the upper parts, and the 

 chestnut on the ujijier breast is also of a somewliat lighter shade. In the Rio 

 Negro specimen the vertical sjiot is of a deeper anrautious colour than in the 

 specimens from the Orinoco and the Rio Vaup6. 



Should these small differences prove to be constant the Orinoco form might 

 perhaps be called H.J/avivertex angosturae Berl. & Lev., but as yet we have not 

 seen the malr bird from Angostura. 



