Oilk- 
THAMNOPHILUS. 201 
(Boucard °); Panama, Santiago de Veraguas (Arcé>), Lion Hill (M‘Leannan 2 14), 
Chepo (Arcé 1°), R. ‘Truando (Wood !).—Sourn America, Colombia? and Western 
Ecuador !, 
The typical form of this bird, the true Thamnophilus nevius, is from Cayenne, and 
compared with specimens from British Guiana the Central American bird is a little 
darker with rather more black on the middle of the back and nape; the female, too, is 
darker and not nearly so rufescent on the crown. 
These differences, which were noticed by Taczanowski ®, seem to be so strictly 
associated with the definite range indicated above, that we think it best to separate 
this northern and western form from the true 7. nevius; with the latter bird we 
associate v. Pelzeln’s 7’. cinereinucha, but whether the bird of South-eastern Brazil 
forms another distinct race we are hardly in a position to determine, the series before 
us being insufficient. A Brazilian bird in the British Museum we believe to be a 
female of this form differs considerably from specimens of that sex from Guiana and 
Central America, and also from the female of 7. cwrulescens, which is another closely 
allied race of 7. nevius. 
At one time Mr. Lawrence considered the Panama bird to belong to ZT. amazonicus, 
Scl. 11, but he subsequently referred Costa Rica examples to 7. nevius+, and this has 
been the practice of all subsequent writers until now. ‘The colour of the iris was 
noted by M‘Leannan as brown !!, whilst Salmon gives it as white®. As this section of 
the genus has little to do with that of which 7. doliatus, a white-irised species, is 
typical, we are inclined to consider M‘Leannan’s determination correct. 
The same collector states that the bird is not common at Panama, where it is found 
in low trees and bushes!!,_ Mr. Wood, who accompanied Lieut. Michler’s expedition to 
Darien, frequently saw individuals of this species, generally on the ground in patches 
of the plant called Spanish bayonet, where they seemed to be catching insects !. 
e. Minores: caput plus minusve cristatum ; ale nigre, albo marginate ; 
cauda albo terminata. 
7. Thamnophilus pulchellus. 
Thamnophilus, sp.?, Cassin, Pr. Ac. Phil. 1860, p. 189. no. 88°. 
Hypolophus pulchellus, Cab. & Heine, Mus. Hein. ii. p. 16’. 
Thamnophilus pulchellus, Berl. Ibis, 1881, p. 245°; Scl. Cat. Birds Brit. Mus. xv. p. 204°. 
Supra rufo-brunneus, capite toto nigro, lateribus cum fronte et gula:albo variegatis ; alis nigricanti-fuscis albo 
late limbatis, tectricibus supra caudalibus longioribus nigris albo terminatis; cauda nigra albo terminata, 
rectrice extima in pogonio externo quoque albo: subtus albus, pectore et abdomine antico nigris, hypo- 
chondriis rufo lavatis: rostro nigricante, mandibula infra pallida, pedibus plumbeis. Long. tota 6:0, 
alee 2°8, caude rectr. med. 2°3, rectr. lat. 1-7, rostri a rictu 0-9, tarsi 1*1. (Descr. maris ex Santa 
Marta, Colombia. Mus. nostr.) 
Q supra rufa, capite summo dorso concolori, capitis lateribus albidis nigro variegatis: subtus cervina, abdomine 
medio albicantiore ; alis fuscis, tectricibus et secundariis internis albido limbatis, reliquis cum remigibus 
BIOL. CENTR.-AMER., Aves, Vol. II., February 1892. ? 26 
