Page:Birds of North and Middle America partV Ridgway.djvu/66

38 to ochraceous-buff; rest of under parts plain deep buff to nearly ochraceous-buff (or between ochraceous-buff and clay color); length (skins), 134-155 (147); wing, 67-71 (68.6); tail, 54-59 (56.3); culmen, 17-20 (18.7); tarsus, 25-27 (26.1); middle toe, 15-16.5 (15.8). Eight specimens from Panamá (mainland).

The series examined from Panamá comprises three adult males in dark, heavily barred plumage, like the type, and ten which are more or less decidedly lighter in color, some of them indistinguishable, so far as I am able to see, from Colombian examples labeled Thamnophilus albicans. In fact, unless there are two forms of the species in Panamá, which is hardly probable, the individual variation in this species is much greater than in T. doliatus, which is reasonably constant within definite geographic areas. At present I have neither the material nor time necessary for more satisfactorily working out the problem, which, judging from the material examined, is a very complicated one.

The following measurements of specimens belonging to the radiatus group are given below for comparison with those of Panamá examples: