EMPIDONAX. 79 
overlooked by subsequent writers. Mr. Ridgway makes no reference to Tyrannula 
affinis, and the name does not appear in Mr. Sclater’s recently published catalogue. 
The latter author, though he otherwise adopts, almost in its entirety, Mr. Ridgway’s 
classification of Himpidonax, does not admit the distinctness of E. fulvipectus, Lawr., 
from FE. obscurus. But with a more extensive series before us we have little difficulty 
in separating them by the characters pointed out above. 
Li. affinis occurs throughout the valley of Mexico, together with E. obscurus and the 
species next described as /. canescens, all of them being equally common. It also 
occurs with 7. obscurus at La Parada, in the Sierra Madre del Sur, and northwards in the 
Sierra Madre of Durango and Sonora. Whether the three birds occupy different areas 
in the breeding-season remains to be proved. 
13. Empidonax canescens, sp. n. 
E. obscuro quoque affinis, sed corpore supra multo magis griseo, dorso vix olivaceo tincto: subtus usque ad 
pectus griseus, gutture medio albicante, abdomine albicante flavo vix lavato: rostro angusto elongato, 
mandibula ad basin pallida. Long. tota 5-8, ale 3-1, caude 2°6, tarsi 0°7, rostri a rictu 0-7. (Deser. 
maris ex Mexicalcingo prope urbem Mexico. Mus. nostr.) 
@ mari similis. 
Hab. Mexico, Ixtapalapa, Culhuacan, Huipulco, Coapa, Mexicalcingo, and Chimalpa, 
near city of Mexico (ferrari-Perez). 
In Prof. Ferrari-Perez’s collection of birds made during the winter and spring months 
of 1887-88 are many specimens of this species, all taken in the valley of Mexico and 
the surrounding hills. Compared with £. obscurus and E. affinis it is a much greyer 
bird, with a longer narrower bill. Two specimens, in ragged plumage, g and r of 
Mr. Sclater’s Catalogue, and there considered young birds of E. obscurus, belong to this 
species. 
B. Pileus niger. 
14. Empidonax atriceps. (Tab. XL. fig. 3.) 
Empidonaz atriceps, Salv. P. Z.S. 1870, p. 198"; Ridgw. Pr. U.S. Nat. Mus, vi. p. 413°. 
Mitrephanes atriceps, Ridgw. Ibis, 1886, p. 461°; Scl. Cat. Birds Brit. Mus. xiv. p. 220°. 
Supra fuscus; uropygio et collo postico paulo dilutioribus; pileo toto nigro; alis et cauda nigricanti-fuscis, 
secundariis et tectricibus alarum majoribus sordide albo marginatis; rectricibus utrinque extimis extrorsum 
albo limbatis: subtus ochraceo-fuscus ; gula et ventre imo albicantibus ; loris et macula postoculari albidis ; 
campterio et subalaribus sordide albis: rostri maxilla nigra, mandibula flava; pedibus nigris. Long. tota 
4-5, ale 2:3, caude 2:0, tarsi 0-6. (Descr. exempl. typ. ex Volcan de Chiriqui. Mus. nostr.) 
Hab. Costa Rica, Irazu (Rogers*), Pirris (J. Cooper?); Panama, Volean de Chiriqui 
(Arcé +). 
This very distinct species was discovered by our collector Arce on the southern slope 
of the Volcan de Chiriqui, and it has since been found in Costa Rica. 
Mr. Ridgway, followed by Mr. Sclater, places /. atriceps in the genus Mitrephanes, 
but we still think it fits much better in Empidonaz. It has no crest, the tail is not 
