THAMNOPHILUS. 203 
Buctzotz and Peto in Yucatan, Meco and Cozumel Is. (G. F. Gaumer); Brivisu 
Honpuras, Orange Walk (G. F. Gaumer), Belize, San Antonio and Cayo (Blan- 
caneaux); GuatemaLa (Velasquez !?!, Constancia ”), Choctum, Chisec, Cahabon, 
Coban, San Gerdénimo, Savana Grande, Escuintla road, Volcan de Fuego, Duefias § 
(O.S.& F. D. G.), Retalhuleu (W. B. Richardson) ; Honpuras, Omoa (Leyland °), 
San Pedro (G. M. Whitely 27), Truxillo (Townsend #1); Satvapor, La Libertad and 
Volcan de San Miguel (W. B. Richardson); Nicaragua, Chinandega and Volcan 
de Chinandega (W. B. Richardson), Sucuyd? and Los Sabalos18 (Nutting), 
Greytown (Holland ?3) ; Costa Rica, San José (v. Frantzius 2+), San Mateo 
(Cooper *+, Boucard ), Sarchi (Cooper 24), Bebedero de Nicoya (Arcé), La Palma 
(Nutting *°), Jimenez, Las ‘Trojas, Cartago, Naranjo de Cartago, Pozo Azul de 
Pirris (Zeledon *°); Panama, David (Bridges*), Bugaba (Arcé°), Lion Hill 
(M‘Leannan ?°),—VuEnnzveLA?; Trintpap?7; Gurana!?; Lower AMAzoNS 7. 
The position of the Central American form of this species with respect to the typical 
bird from Guiana has long been a matter of doubt. When the bird was first found in 
Guatemala by Velasquez? his specimens were referred by Bonaparte the male to 
T. doliatus (L.) and the female to 7. rutilus (Vieill.); the relationship of the sexes 
being then not understood. The birds obtained by Sallé and Boucard in Southern 
Mexico and by ourselves in Guatemala were also called 7. doliatus. Cabanis and Heine, 
in 1859, separated the Mexican bird as 7. affinis 2? on its supposed larger size and the 
wider separation of all the transverse bands. Mr. Allen, in 1889 22, endorsed these 
differential characters, but changed the name of the Mexican bird to 7. doliatus 
mexicanus, the term affinis having been used for a bird of the same or an allied genus. 
The name 7. affinis had in the meantime been often applied to the Central American 
bird. A further separation was made by Mr. Ridgway when he described a male and 
a female from Honduras as 7. intermedius 31. The latter birds he compared with 
T. nigricristatus, but from the fact of the bases of the feathers of the crest being white 
T. doliatus must be its nearest ally. The type of the male, which Mr. Ridgway has 
kindly sent us for examination, proves this to be the case, and we are inclined to think 
T. intermedius to be an unusually dark form of 7. doliatus, just as the Yucatan birds 
are unusually light. | 
We have now a large series of this bird before us from all parts of its range, and 
comparing Mexican specimens with others from Guiana we do not see any tangible 
grounds for separating them. Difference in size there is practically none, and as for 
the width of the alternate black and white bands of the plumage, so much variation 
occurs everywhere that we are unable to associate any particular style with any parti- 
cular area. We believe that the birds which have the narrowest white bands on the 
upper surface are the oldest, as young birds with only a trace of immaturity are often 
widely banded, and even, as in the case of some Yucatan specimens before us, nearly 
spotless white on the abdomen. 
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