200 Proceedings of the Biological Society of Washington. 



In this, the typical race, the general coloration averages considerably 

 deeper than in any of the other known forms, as shown by a comparison of 

 freshly collected specimens. Old skins are almost invariably faded, and 

 worn specimens are not suitable for comparison either. Some British 

 Guiana skins seem to be nearer to this form, while others are indistin- 

 guishable from venezuelensis. Specimens from the upper Orinoco and 

 Amazonian Colombia are also best referred here, as well as those from Peru. 

 Fresh Bahia skins are certainly typical ferox, and not swainsoni, which 

 indicates the limit of the form in this direction. 



Mr. Hellmayr has described the bird from Tobago as a distinct race, 

 insulicola, on the ground of larger size and darker coloration. The single 

 specimen (unsexed) we have been able to examine from this island measures : 

 wing, 90; tail, 89; bill, 20; tarsus, 19.5. It is thus no larger than many 

 French Guiana skins, nor is it any darker colored, allowing for its rather 

 worn plumage. The posterior under parts, however, are much duller and 

 paler than the average, but are approached by some Guiana specimens. 

 The rusty color on the rectrices is significant of immaturity. The outer 

 web of the outer rectrix, however, is markedly paler than in any specimens 

 of ferox in the series consulted, and this may be a good character. It will 

 require a series to demonstrate the validity of this supposed form, in our 

 opinion. 



Specimens examined. — French Guiana: Cayenne, 11; Mana, 27; Pied 

 Saut, 3. Dutch Guiana: Meerzorg, 1; Parako Sarammatta, 1; Geyersvlyt, 

 1. British Guiana: unspecified, 1. Venezuela: Boca de Sina, Cunu- 

 cunuma R., upper Orinoco, 2. Colombia: La Morelia, 2; Florencia, 1. 

 Peru: Candamo, 1; Rio San Miguel, 1. Brazil: Benevides, 4; Santarem, 

 22; Colonia do Mojuy, 1; Villa Braga, 1; Apacy, 2; Obidos, 2; Islands, 

 Obidos, 2; Avojutuba, Rio Negro, 4; Monte Alegre, 1; Conceicao, 1; Isla 

 do Papageio, 1; Isla de Goyana, 1; Arumatheua, 2; Terra Nova, Rio Iriri, 

 1; St. Antonio da Cachoeira, 1; Sta. Maria, Mexiana I., 1; Mexiana I., 1; 

 Rio Maicuru, 1; Manacapuru, 1; Forte Ambe, Rio Xingu, 1; Bom Lugar 

 Rio Purus, 2; Flor do Prado, 2; Bahia, 6. Total, 112. 



Myiarchus ferox swainsoni Cabanis and Heine. 



Tyrannus ferox (not M uscicapa ferox Gmelin) Swainson, Quart. Journ. Sci., 

 XX, 1826, 276 (Brazil; descr.; crit.). — (?)D'Orbigny and Lafresnaye, 

 Mag. de Zool., 1837, Syn. Avium, 43 (Chiquitos, Santa Cruz, and Yungas, 

 Bolivia).— D'Orbigny, Voy. Am. Mer., Oiseaux, 1844(?), 306, excl. syn. 

 part (Yungas, Moxos, and Santa Cruz de la Sierra, Bolivia; diag.). 



Muncicapa ferox (not of Gmelin) Wied, Beitr. Nat. Bras., Ill, ii, 1831, 

 855 (de.scr.). 



Myiarchus ferox (?)Burmeister, Syst. Ueber. Thiere Bras., II, 1856, 470, 

 part (Brazil; descr. female; crit.). — Euler, Journ. f. Orn., XV, 1867, 

 228 (Cantagallo, Brazil; descr. nest and eggs). — von Pelzeln, Orn. 

 Bras., ii, 1869, 116, part (locahties in southern Brazil; crit.). — Rein- 

 HARDT, Vidensk. Med. Nat. For. Kjobenhavn, 1870, 141, part (Lagoa 

 Santa, Brazil; crit.).— Sclater, Cat. Birds Brit. Mus., XIV, 1888, 253, 

 part (localities and references for Bolivia, southern Brazil, and Argen- 



