Jan. #2] 
1902 
BANGS — CHIRIQUI BIRDS Si 
MEASUREMENTS (in millimeters). 
Sex Exposed 
No. and age Wing Tail ‘Tarsus culmen 
8651 é ad. 59.0 23.5 22.0 17. 
$652 ad. G7/aS 25.0 20.5 17. 
8653 Guage 58.0 24.0 22.0 17s 
Remarks.— Microcerculus divides into local species, each with a 
comparatively limited range, in the most astounding manner. So 
many forms had already been described from near-by localities 
that it was with some hesitation that I made up my mind to name 
another, and only after the most careful comparisons, when I 
found it impossible to refer the bird of the Volcan de Chiriqui to 
any of them. 
The neighboring species are: — 
M. luscinia Salv. of Santa Fé de Veragua and Santiago de 
Veragua, south to Panama. 
M. daulias Ridg., Atlantic side of Costa Rica. 
M. orpheus Ridg., Pacific side of Costa Rica. 
M. philometa (Salv.), Guatemala. 
From all of these JZ. acentetus differs much, except from JZ. 
orpheus, which is its nearest ally. From this species the new 
form can be told by its wholly unbarred back, rump and upper 
tail coverts, its much less varied under parts, and shorter bill. 
Cyanolyca argentigula(Lawr.). 
Eleven specimens, adults of both sexes, Volcan de Chiriqui, 
gooo feet, June. 
This jay and the following species appear to be extremely local 
in their distribution. A small colony of C. argentigu/a was found 
at the spot where these were taken, but the species was seen 
nowhere else on the Volcan de Chiriqui. On the Caribbean slope 
Mr. Brown took the three specimens of C. cucu//ata, but saw no 
more of that species. 
