Carriker: Costa Rican Formicariid.^. 9 



Boruca de Terraba, 2 c? and 2 9, Jul}^ 1907. 



Buenos Aires de Terraba, i 9, August, 1907. 



These skins, with the sole exception of the Bebedero specimen, are 

 identical in coloration and agree exactly with descriptions of the type 

 of Cercomacra tyrannina (Sclater). 



On the other hand there are 21 skins (7 c? and 14 9) from various 

 points along the Caribbean watershed from Carrillo to the Lower Rio 

 Sicsola, all agreeing perfectly one with another, with the specimen 

 from Bebedero, and exactly with Mr. Bangs' description of Cercomacra 

 crepera ! Such obvious facts can point to but one conclusion, namely, 

 that Cercomacra tyrannina tyrannina (Sclater) inhabits the Pacific 

 slope from Colombia northward to, and including, the Terraba and 

 Pirris valleys of Costa Rica, while the variety Cercomacra tyrannina 

 crepera is the form confined (?) to the Caribbean coast, a parallel to 

 what we have in so many other cases. However, there still remains 

 to be explained the presence of Cercomacra tyrannina crepera at 

 Divala, Chiriqui. It is very evident that it has crossed from the 

 Caribbean to the Pacific through the valley of the San Juan, as ex- 

 plained by the Bebedero bird. Could it be possible that such a thing 

 has occurred farther south ? If so, it would explain the presence of the 

 Caribbean form at Divala. 



Drymophila stictoptera Lawrence = D. laemosticta Salvin. 



During all my collecting in Costa Rica, covering a period of five 

 years, I have never taken or seen a skin of a male D. Icemosticta, or a 

 female of D. stictoptera, and am forced to the conclusion that the same 

 error has been made and perpetuated in regard to these birds, which 

 was made in the case of Thamnophilus bridgesi (Sclater) and T. punc- 

 tatus Cabanis, and which was corrected by Mr. Cherrie (Auk, X, p. 

 279), who showed that T. punctatus was the male of T. bridgesi. 



The type of Drymophila Icemosticta, from Tucurriqui, Costa Rica, 

 had no sex indicated, and the only other specimen in existence at the 

 time was a female from Santa Fe de Veragua, both collected by Arce. 

 The type of D. stictoptera is a male, collected at Angostura, Costa 

 Rica, by J. Carmiol. The inference is obvious, and I would therefore 

 reduce D. stictoptera to a synonym of D. Iczmosticta Salvin. 



