386 bulletin: museum of comparative zoology. 



tively identify it as belonging to the eastern Brazilian form, and hence 

 adopt the name siilendens. On account of fading the type is somewhat 

 browner than fresh specimens. 



We have not seen any authentic examples of the female of this form, 

 but a specimen (A. M. N. H. 43,674) marked "Brazil?," the dimen- 

 sions of which are too small for polychoptervs and rather large for 

 irisiis, may possibly belong to this form. The measurements are: — 

 wing, 75.0; tail, 55.5; tarsus, 18.0; exposed culmen, 13.0. 



3. Pachyrhamphus polychopterus variegatus (Spix). 



Pachyrhynchus variegatus 8pix, Av. Bras., 1825, 2, p. 31, pi. 4.3, fig. 3 (cT juv.) 



(No type4ocality stated — we designate Upper Amazon, near Fonteboa). 



Type lost — fide Hellmayr, Abh. K. Bayer, akad. wiss., 1906, 22, abt. 3, 



p. 666. 

 Pachyrhyncfius niger Spix, Av. Bras., 1825, 2, ]). 33, pi. 45, fig. 1 (o^ ad.) (No 



type4ocality stated — "Amazonas prope Fonteboa," designated by 



Berlepsch and Hartert, Nov. zool., 1902, 9, p. 56). Type bst — fide 



Hellmayr, loc. cii., p. 669. 

 PachyrJtamphus nigriventriti Schiter, Proc. Zool. soc. London, 1857, p. 76 (new 



name for Pachyrhynchus niger Spix). 



SuBSPECiFic CHARACTERS. — ■ Similar to Pachyrhaiiiphas polycho plcrus poly- 

 chopterus (Vieillot) of South Brazil, but smaller, and even blacker, the adult 

 male having practically unmottled, black rump, under parts and under tail- 

 coverts. 



Measurements. — ^Male (two specimens) — wing, 73.0-75.5; tail, 

 58.5-56.5; tarsus, 18.0-18.5; exposed culmen, 13.0-12.8. 



Range. — Northern Bolivia, Upper Amazon, northeastern Peru 

 (Hellmayr), eastern Ecuador (Hellmayr). 



Specimens examined. — Northern Bolivia: Lower Beni, 1 d^ (not 

 typical). Western Brazil: Porto Velho, Rio Madeira, 1 im. cf. 

 Total, 2. 



Remarks. — It is by no means certain that a large series of speci- 

 mens from the Upper .\mazon would not prove the identity of this 

 small dark form with the next, the darkest specimens of which quite 

 match the only adult male of P. p. variegatus ( = niger) we have seen. 

 For the present, however, we keep the two forms separate, more on 

 the authority of Hellmayr and other in^'estigators, than on the evi- 

 dence presented by our own specimens. P. p. variegahis is the only 

 form of which we have not been able to examine sufficient material. 



