1915.] Chapman, New South American Birds. 369 
on the nape than any of our Trinidad specimens. It may develop that 
hellmayrt is an insular form. 
Leptotila rufaxilla pallidipectus subsp. nov. 
Char. subsp.— Differs from all the known forms of this species in its much paler, 
buff-tinted (vinaceous-buff) breast, paler light brownish olive back, practically without 
purplish reflections; more grayish, less iridescent occiput and nape; the gull-gray 
of crown as restricted as in L. r. dubusi, the throat as extensively white as in hell- 
mayrt; agreeing in size with the former. 
Type.— No. 121397, Am. Mus. Nat. Hist., # ad., Buena Vista (alt. 4500 ft.), 
Eastern Andes above Villavicencio, Col., March 3, 1913; F. M. Chapman. 
Range.— Tropical Zone at the eastern base of the Eastern Andes in 
Colombia (and Venezuela?) probably north of Amazonian forest-line at the 
Guaviare River. | 
Remarks.— The strongly marked characters on which this form is based 
are well shown by four specimens, three of which are from Villavicencio, 
at the foot of the mountains below Buena Vista. Although geographically 
nearer dubust than is hellmayrt, the last two more nearly resemble one another 
than pallidipectus does either. Its paler coloration may doubtless be 
attributed to the less humid conditions prevailing north of the Amazonian 
forest line, which, in Colombia conforms approximately with the Guaviare 
River. About Villavicencio it was found in the growth bordering streams 
and under these conditions its range may extend eastward on the llanos. 
Specimens examined.— Colombia: Buena Vista, 1; Villavicencio, 3. 
Leptotila rufaxilla dubusi (Bonap.). 
Leptoptila dubust Bonar., Consp. Av., IL, 1854, p. 74, (Rio Napo, Ecuador). 
Char. subsp.— Most nearly resembling L. r. hellmayri but upperparts averaging 
more olive, less cinnamomeus, front and sides of the throat and postocular region with 
less pinkish cinnamon; white of throat more restricted, confined largely to the chin; 
forehead darker; gull-gray of crown less extended posteriorly, reaching little if any 
behind the eyes; wings and tail shorter. Easily distinguished from L. r. rufazilla 
by its more cinnamon upperparts, paler crown, deeper vinaceous breast, small white 
throat area, and smaller size. 
Range.— Tropical Zone at the eastern base of the Eastern Andes from the Guavi- 
are River in Colombia southward into Ecuador eastward through the Amazonian 
region to the western border of the range of L. r. rufaxilla. 
Rem specimens of rufaxilla from the Napo region 
but Bonaparte’s description (J. c.) and the close resemblance existing be- 
