\YW ASS 
Marcu 13, 1914 Vou. IV, pp. 101-102 
PROCEEDINGS 
OF THE 
NEW ENGLAND ZOOLOGICAL CLUB 
A NEW MAGPIE-JAY FROM WESTERN COSTA RICA. 
BY OUTRAM BANGS. 
In 1897 Nelson separated, as Calocitta formosa azuwrea, the 
Magpie-jay of Chiapas, restricting the typical form (Calocitta 
formosa formosa (Swainson)) to southwestern Mexico, from Colima 
to Oaxaca. Nelson thought his new form ranged from the type 
region south to the extreme southern limit of the species — western 
Costa Rica. 
Ridgway, in ‘Birds of North and Middle America,’ followed 
this geographical arrangement of the races, but pointed out certain 
differences shown by extreme southern specimens, saying that 
he lacked sufficient material to prove whether or not they were 
constant. 
A few years ago C. F. Underwood collected for me in Costa Rica 
a series of nine skins which, when critically compared with numer- 
ous examples of the two accepted races, show at once that three 
instead of two geographical forms must be recognized. Contrary 
to what might be expected, the form holding the middle position — 
C. f. azurea Nelson of Chiapas and Guatemala — is the largest in 
size, and differs more in general color from either of the extreme 
forms than they do from each other. 
To the southern form, which I now describe as new, I should 
