112 



Bangs Birds from Costa Rica and Chiriqui. 



Chlorospingus regionalis sp. nov. 



Type from Cariblanco de Sarapiqui, Costa Rica. cJ 1 adult. No. 17,491, 

 coll. of E. A. and O. Bangs. Collected August 11, 1899, by C. F. Under 

 wood. 



Characters. Similar to Cldoro#pwgus novicius Bangs of Volcan de Chir 

 iqui, but much duller in color, especially below, the rich greenish ochre 

 of jugulum and olive yellow of breast and sides and under tail coverts of 

 C. novicius being replaced in the new form by dull yellowish, olive-green 

 slightly brighter and more yellowish on jugulum and darker and duller 

 on sides and under tail coverts ; back duller and browner olive and size a 

 little larger than in C. novicius. 



MEASUREMENTS. 



At the time I separated C. noticing from C. albitempora (Lafr.) of South 

 America, Ridgway and I together compared very carefully the Chiriqui 

 series with such specimens from Costa Rica as were in the National 

 Museum, and made up our minds that birds from the two regions were 

 subspecifically distinct, as suggested by Ridgway Birds of North and 

 Middle America, Part II, p. 164, foot-note. The use here of a binomial for 

 the form, is not because I consider it very different from C. novicius, but 

 because both may eventually prove to be subspecies of C. albitempora, and 

 in such cases, until the real relationships of the forms are established, 

 binomials are preferable to trinomials. 



Junco vulcani (Boucard). 



The Irazu Junco, the most southern and most aberrant member of the 

 genus, is confined, so far as known, to the summits above timber line, of 

 the Volcan de Chiriqui and of Irazu. One would naturally expect to find 

 a bird of such peculiar habits and habitat differentiated into at least sub 

 species on these two isolated peaks. I have before me now a beautiful 

 suite of specimens, which includes adults and young taken on correspond 

 ing dates from both Irazu and the Volcan de Chiriqui, and while there is 

 a slight difference in birds from the two volcanoes I am unable satisfactorily 

 to separate them. Birds from Irazu area little darker, with slightly grayer 

 heads and with backs more heavily marked with black than in those from 

 the Volcan de Chiriqui, but the differences are trifling and not altogether 

 constant, and after very careful consideration I have decided it would be 

 unwise to divide the species into two subspecies. 



