112 Bangs — Birds front Costa Rica and Chlriqid. 



Chlorospingus regionalis sp. nov. 



Type from Cariblanco de Sarapiciui, Costa Rica, c? adult. No. 17,491, 

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

 wood. 



Characters. — Similar to ChlnyoxjinKjiLs iiov'iv'ms 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 

 dtoeicivs 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. nuvicius. 



MEASUKEMKNTS. 



At the time I separated C. ridriciufi fiom C. idhiteinpom (Lafr.) of South 

 America, Ridgway and I together conipaied very carefully the Ciiiriqui 

 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 

 subspecitically distinct, as suggested by Ridgway — Birds of North and 

 Middle America, Part II, p. 1(54, foot-note. The use here of a binomial for 

 the form, is not because I consider it very different fioin C. iiorlcius, Init 

 because both may eventually prove to be subsj)ecies of C. albileiupdia, 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 C'hiri(jui and of Irazu. One would naturally expect to find 

 a bird of such peculiar haljiits and habitat difl'erentiated into at least sub- 

 species on these two isolated i)eaks. I have Ijefore me now a beautiful 

 suite of specimens, which includes adults and young taken on correspontl- 

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

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

 to sei)arate them. Birds from Trnzii area little daiker, with slightly grayer 

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

 the Volcan de Chiriciui, 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. 



