206 rOEMICAEIID^. 



3000 feet. From the State of Panama we have received specimens both from the 

 district of Chiriqui and from Calovevora, lying further in the direction of the isthmus, 

 but the bird has not been noticed on the line of railway nor to the southward. The 

 Panama birds are a little darker on the upper surface than the types, and thus approach 

 the Ecuador form, which has been separated by Mr. Sclater as Thamnistes cequatorialis. 

 The last-named bird is very closely allied to T. anabatinus, and the existence of a,n 

 intermediate form indicates that there is probably no specific difference. 



Of the habits of this species nothing has been recorded ; our Guatemalan specimens 

 were secured by Indian hunters. 



b". Bostrum debile, leviter hamatum. 



DYSITHAMNUS. 



Dysithamnus, Cabanis, in Wiegm. Arch. f. Naturg. 1847, xiii. p. 223 ; Scl. Cat. Birds Brit. Mus. 

 XV. p. 219. 



Dysithamnus is closely allied to the smaller forms of Thamnophilus, and there seem 

 to be no obvious characters by which to distinguish them. The bill is certainly some- 

 what feeble, but when the size of the birds is considered this point loses its value. The 

 bill, as well as the wings and legs, conform to those of such species as Thamnophilus 

 noEvius. The tail seems less rounded. 



Mr. Sclater places fourteen species in Dysithamnus, and mentions the names of two 

 others unknown to him. These are distributed over a wide area, extending from 

 Guatemala to South Brazil. Only three species occur within our region, of which 

 D. semicinereus has a wide range. The other two are both peculiar to the southern 

 section of our Fauna, both occurring in Costa Rica and one of them in the State of 

 Panama. 



a. Pileus unicolor. 



1. Dysithamnus semicinereus. 



Dysithamnus semicinereus, ^(^, P. Z. S. 1855, p. 90, t. 97 ' ; Cat. Birds Brit. Mus. xv. p. 221°; 

 Scl. & Salv. Ibis, 1860, p. 399 ' ; Salv. P.Z. S. 1867, p. 141* j 1870, p. 191.' ; Lawr. Ann. 

 Lye. N. Y. ix. p. 107 " j Boucard, P. Z. S. 1878, p. 60 ' ; Tacz. Orn. Per. ii. p. 29 ' j Zeledon, 

 An. Mus. Nac. Costa Rica, 1887, p. 114 ". 



Olivaoeo-cinereus, capite summo tinicolore pure cinereo ; alia et cauda dorso concoloribus ; tectricibus alarum 

 minoribus nigris, his et reUquis anguste albo hmbatis : subtus cinereo-albicans, pectore obscuriore ; hypo- 

 chondriis vix olivaceo lavatis ; subalaribus et remigibus intus albis flavido tinctis : rostro et pedibus 

 plumbeis. Long, tota 4'5, alse 2-3, caudee 1*55, rostri a rictu 0"67, tarsi 0-75. 



? supra fuscescens baud cinereo tincta ; ahs et cauda concoloribus, hujus tectricibus apicibus paUidis ; capite 

 sumioo rutescente unicolore : subtus ochraceo-alba, gula fere alba, pectore et hypochondriis fusces- 

 centibus ; rostro et pedibus plumbeis. (Descr. maris et feminae ex Verse Pacis septentrional i. Mus. 

 nostr.) 



