1908.] NATURAL SCIENCES OF PHILADELPHIA, 495 



in size and color; and then identified the macroura of Cabanis with his 

 new race cabanisi, a pale bird differing only slightly in measurements 

 from pallescens Cab., from which it does not seem separable. 



As a matter of fact macroura and " cahanisi" differ more in color than 

 do mexicana and mehleri, which Dr. Allen regarded as the most distinct 

 of any of the races. 



Dr. Allen used Bonaparte's name mehleri for the Ecuador bird, 

 apparently overlooking Sclater's statement, but he rightly surmised 

 that the Bolivian birds were separable, though he allied them to the 

 Ecuador form instead of to macrowra, to which they are closely related. 

 P. dree Bon., correctly referred to macroura by Cabanis, is doubtfully 

 referred to mehleri by Dr. Allen. 



Hellmayr {Nov. Zool., XIII, p. 43) describes as new the Trinidad 

 bird, calling it insulana, and gives a good resume of the several forms 

 recognized by him. He here distinguishes guianensis from cayana, 

 although he later regards them as not separable; he also adopts 

 Dr. Allen's cabinisii for the big dark colored macroura, apparently 

 overlooking the fact that Dr. Allen's bird, which ''differs little in color 

 from pallescens," could hardly have the ''crissum black," 



Von Ihring {Revista Museo Paulista, 1904, p. 448) recognizes Allen's 

 error in writing P. macroura and P. cabanisi and again renames the 

 former var. yuarania. 



Key to the Species and Subspecies. 



Plieum gray sharply contrasted with the rest of the upper parts, 



melanogastra. 

 Pileum uniform with the upper parts or very nearly so. 



Size very small; wing 4.12 in. ; throat cinnamon rufous, . minuta. 

 Size medium or large, wing 5.50-6.80; throat vinaceous. 

 ferruginous above, 

 large, tail 11.30-12.70. 



tail strongly rufous below, black subterminal bands strongly 

 defined. 



bill large, columbiana. 



bill small, mexicana. 



tail dull blackish brown below, black subterminal bands not 



clearly defined, pallescens. 



small, tail 9.30, insulana. 



bay above. 



tail uniform dull black beneath, no trace of subterminal bands. 



crissum gray, cayana. 



crissum black, nigrocrissa. 



tail below with rusty on the outer webs at least. 



thighs gra}^, tail 10.50-11, mehleri. 



thighs black, tail 12, • . caucce. 



