Jan. 30"] 

 1902 J 



HANGS — CHIRIQUI BIRDS 43 



Remarks. — After examining the series of Grallariculas in the 

 National Museum, which includes the type of G. costaricensis and 

 other specimens of that species and of G. flavirostris of Ecuador 

 and Colombia, I found no trouble in at once telling these two spe- 

 cies apart. Neither could the one specimen upon which I found 

 G. vegeta be referred to either of them. It differs from both in its 

 much darker, more grayish, back and head. Though most authors 

 lump under one name all of these birds from Ecuador to Costa 

 Rica, there appear to be at least three well-marked forms in this 

 area. 



Siptornis rufigenis (Lawr.). 



Fifteen specimens, adults of both sexes and young in various 

 stages of plumage, Boquete, Volcan de Chiriqui and Caribbean 

 slope of Volcan de Chiriqui, 4000 to 7500 feet, January, Febru- 

 ary, March, April and June. 



This fine series clearly shows that the bird from Costa Rica 

 described as Synallaxis rufigenis by Lawrence was a young example 

 and that the supposed characters of the species are simply those 

 of immaturity. 1 The adult birds, however, are not the same as .5. 

 erythrops Scl. of Pallatanga, Ecuador, as they have been supposed 

 to be, and Lawrence's name holds for a valid form. 



Adult birds from Costa Rica and Chiriqui differ from S. erythrops 

 of Ecuador in being much darker below and above, with wings 

 deeper chestnut, and the chestnut of cap more extended over 

 malar and auricular regions. 



Specimens wholly in young plumage vary somewhat. In no. 

 8553 the cap is dark grayish olive, the postocular stripe is pale 

 yellowish olive and the under parts have but little trace of any 

 ochraceous tinge. In no. 8554 the cap is olive, the postocular 

 stripe and malar and auricular regions are orange rufous, and the 



1 Synallaxis rufigenis Lawr., Ann. L. N. Y., Vol. IX, p. 105, 1868. Type locality : Costa Rica. 



Sclater, Cat. Birds British Museum, Vol. XV, p. 60, describes the same plumage, mentioning a 

 specimen in the Salvin-Godman collection. 



Salvin and Godman, Biol. Centr. Amer., Aves, Vol. II, p. 152, Tab. 45, fig. 2, describe and 

 figure their specimen from Costa Rica, saying that it is immature and that they greatly doubt the 

 validity of the species. 



