308 Bangs, Birds from Western Costa Rica. [jn^ 



Remarks. The two geographical races into which Cyanerpes lucidus 

 divides are easily separated by the measurements, as given above; the 

 color differences are not altogether constant, though they show very well 

 in series. 



True Cyanerpes lucidus, originally described from Guatemala by Sclater 

 and Salvin, I should restrict to Guatemala, Honduras and Salvador and 

 call all specimens from Nicaragua, Costa Rica and Panama Cyanerpes 

 lucidus isthmicus. Specimens from eastern Costa Rica and from Nica- 

 ragua show some signs of being intermediate, but still, on the whole, 

 go better with the more southern race than with true C. lucidus. 



The distribution of these two races of C. lucidus conforms to that of 

 many species of birds that occupy the same area in Central America and 

 points to a general faunal division, the exact lines of which vary a little, 

 separating the biota of northern and southern Central America. 



Dacnis cayana callaina Bangs. Nine specimens, adults of both sexes 

 and young males, Boruca and Paso Real, May and July. 



Dacnis venusta Latvr. Five males, four adult, one young, Boruca, May 

 and June. 



Coereba mexicana (Sclater). Thirty-six adults, both sexes, Boruca, 

 Barranca, and Pozo del Rio Grande, April-August. 



ICTERID.E. 



Cacicus microrhynchus (Scl. & Sal v.). Four adults, both sexes, Pozo 

 del Rio Grande and Lagato, April and May. 



Amblycercus holosericeus (Licht.). Thirty-seven specimens, both sexes, 

 Boruca and Pozo del Rio Grande, April-August. 



Icterus spurius (Linn.). One adult male, Pozo del Rio Grande, August 

 10. 



Tanagrid.e. 



Euphonia gracilis (Cabanis). Nine specimens, adults of both sexes 

 and young, Boruca, Paso Real, Barranca and Pozo del Rio Grande, June- 

 August. 



Euphonia luteicapilla (Cabanis). Twenty-eight specimens, adults of 

 both sexes and young, Boruca, and Paso Real, April-July. 



Euphonia minuta humilis (Cabanis). Two males, neither quite adult, 

 Boruca, May. 



Euphonia crassirostris Sclater. Three males, none of them fully adult, 

 May and July. 



Calospiza guttata chrysophrys (Scl.). Four specimens, adults of both 

 sexes and one young male, Boruca and Barranca, June. 



Calospiza gyroloides (Lajr.). Thirty-eight specimens, adults and young 

 of both sexes, Boruca and Barranca, April-June. 



Calospiza larvata fanny (La jr.). Forty specimens, adults and young 

 of both sexes, Boruca and Paso Real, April-July. 



