366 



Bangs, Collection of Birds from Chiriqui. 



TAuk 

 LOct. 



Measurements (in millimeters). 



Remarks. The type locality of Ccrcomacra tyrannina is Bogota ; from 

 this region north to Panama the form extend? without change. Speci- 

 mens collected by Mr. Brown at Loma del Leon, precisely matched skins 

 from the type locality. In Nicaragua and Chiriqui the present form re- 

 places C. tyrannina, and the two may prove only subspecifically distinct, 

 but the differences in color are so marked that it seems best, for the pres- 

 ent at least, to regard them as distinct species. 



I am a little astonished that this bird, which is not rare in Nicaragua 

 and Chiriqui, and is often found in collections from these countries, should 

 not have been named before, it is .so noticeably different in color from C. 

 tyrannina. 



Gymnocichla nudiceps (Cassiti). — Seven males, Divala, October, 

 No\-ember and December. 



Formicarius umbrosus Ridg-v. — One $, not fully adult, Divala, De- 

 cember II. 



Thamnophilus transandeanus Scl. — Thirteen specimens, both sexes, 

 Di\ala, October, No\ember and December. 



Thamnophilus doliatus {Linn.). — Thirteen specimens, both se^es, 

 Divala and David, October, November and December. The races of this 

 species are rather difficult to understand. Birds from Chiriqui and north- 

 ward have the general appearance of true T. doliatus of Guiana, but from 

 the region lying between the ranges of these two comes the quite different 

 black-crested T. doliatus nigricristatus. The northern bird has been 

 called T. doliatus affinis (Cab. & Heine), but Bonaparte's name T. rutilus., 

 based on a female from Guatemala, appears to be the proper name of the 

 race, should it prove distinct. I do not use it here because, so far, in 

 spite of its curious distribution, I ha\e been unable to find anj satisfac- 

 tory way of distinguishing it even as a subspecies. 



Thamnophilus punctatus Cab. — Fourteen specimens, both sexes, 

 Divala and David, October, November and December. The females are, 

 of course, the so-called T. bridgesi. Mr. Cherrie, was, I believe the first 

 to discover that T. punctatus and T. bridgesi are but the male and female 

 of one and the same species. 



Gymnopithys bicolor olivaceus Ridgtv. — Two specimens, J and $, 

 Divala, November and December. 



