1915.] Chapman, New Colombian Birds. 637 | 
and forehead dark chestnut passing into black or fuscous-black on the back, upper tail- 
coverts, tail, and exposed surfaces of the wings, all of which are distinctly and evenly 
barred with tawny, which is paler and more ochraceous on the wings; primaries and 
their coverts fuscous, unmarked except for slight marginal ochraceous-tawny spots 
near the ends of the inner ones; throat whitish becoming dusky on the neck; rest of 
underparts deep tawny, mixed with dusky on the breast, most of the breast feathers 
with partly concealed, small, broken, black bars; flanks with broad and conspicu- 
ous black bars which become less distinct on the ventral region; tibise and lower tail- 
coverts barred with black and tawny; feet horn-color; maxilla blackish, mandible 
whitish, darker at the tip and along the commissure. 
Wing, 149; tail, 44; tarsus, 53; culmen, 29 mm. 
Remarks.— I have named this apparently distinct species in honor of 
Mrs. Elizabeth L. Kerr, the collector of the type and only known specimen, 
whose work in the Atrato Valley has added materially to our knowledge of 
the avifauna of that part of Colombia. : 
As an evident representative of Crypturus boucardi, a species unknown 
south of Costa Rica, Crypturus kerrie emphasizes the close faunal re- 
lation existing between the bird-life of western Colombia and that of 
Central America. 
Tachytriorchis albicaudatus exiguus subsp. nov. 
Char. subsp.— Closely resembling 7’. a. sennetti (Allen) but notably smaller with 
the upperparts, particularly the head and sides of the neck, darker and more slaty. 
Type.— No. 130614, Am. Mus. Nat. Hist.,  ad., Barrigon, head of Rio Meta, 
Colombia; Manuel Gonzalez. | 
Remarks.— A specimen from Maripa, lower Orinoco, Venezuela, agrees 
essentially with the type. As stated in the preceding diagnosis, this form 
closely resembles 7. a. sennetti and it is therefore quite unlike true albi- 
caudatus of southern Brazil. Adults of the latter have the upperparts much 
darker (fuscous rather than grayish or slaty) while the chin and throat are 
wholly blackish, instead of pure white or white with some mixture of slaty. 
When fully adult, sennetti (of which we have a large series) has the entire 
underparts, including the throat, pure white. Both my specimens of 
exiquus are adult, one is almost without indication of bars on the tibize and 
abdominal region, the other is but slightly barred on these parts, but in each 
the throat is mixed slaty and white, and I am inclined to regard this marking 
as an approach toward albicaudatus rather than an indication of immaturity. 
This point can be settled, however, only by additional specimens. 
Doubtless the form here described occurs also in British Guiana. I am 
aware that Brabourne and Chubb (Bds. 'S. A., I, p. 66) ‘suggest British 
Guiana’ as the type-locality for albicaudatus, but 1t seems to me beyond 
