64 BANGS — A NEW PHAETHORNIS (ee 
specimens, perhaps, average slightly grayer below, and their bills 
are slightly weaker and straighter, but the differences are so 
small that it is not worth while to recognize the form by name. 
Two skins collected by Mr. W. W. Brown, Jr., at Divala, Chiriqui, 
however, are decidedly darker below than any other Central 
American specimens I have seen, and if other specimens from 
the same region bear out the characters of these two, the form 
must be named as a local race. This would be a case parallel to 
that of Agyrtria amabilis and A. decora; A. amabilis ranges from 
Costa Rica through Panama and Colombia to Ecuador, while the 
very different 4. decora is confined to a small area in Chiriqui— 
the same one from which these dark-colored examples of Phaé- 
thornis come. 
Phaéthornis longirostris (as a species) greatly resembles P. super- 
ciliosus (aS a Species), almost the only way of telling them apart 
being that the former has the gular stripe broader and more con- 
spicuous, and the latter has a greener back and rump. The 
different representative forms of each vary much in size and in 
the length of the bill; and some of the races of the one approach 
very nearly to some of the races of the other, and it is doubtful 
if intergradation does not actually take place between some of 
them. At all events, the interrelationships of the numerous 
representative forms, into which these two species divide in the 
immense area occupied by them in tropical America, are very 
intricate and interesting. 
While collecting in the Santa Marta region of Colombia, Mr. 
W. W. Brown, Jr., took a fine series of a race of Phaéthornis 
Jongirostris that I now describe as new. The bird is rather 
common in the mountains at an altitude of from 3000 to 8000 
feet. Mr. Brown took adults at all seasons of the year and one 
young, February 9, 1899, at La Concepcion, 3000 feet, and one, 
March 17, 1899, at Chirua, 7000 feet. 
Phaéthornis longirostris susurrus’ subsp. nov. 
Type, from Chirua, Sierra Nevada de Santa Marta, Colombia, 7000 feet 
altitude, ¢ adult, no. 6806, coll. of E. A. and O. Bangs, collected March 17, 
1899, by W. W. Brown, Jr. 
1 Susurrus — humming, buzzing. 
