Jan. oe) 
ee BANGS — 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. favirostris 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 Syzallaxis rufigenis by Lawrence was a young example 
and that the supposed characters of the species are simply those 
of immaturity.’ The adult birds, however, are not the same as 5S. 
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. eythrops 
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 
ure their specimen from Costa Rica, saying that itis immature and that they greatly doubt the 
alidity of the species. 
