No. 416.] MAMMALS IN SAN MIGUEL ISLAND. 637 
Skull: The skull of D. callida is very distinctive, and can 
at once be told from that of any of its allies by its slenderness, 
its long, narrow rostrum and long, narrow nasals. The molar- 
form teeth are very small. 
MEASUREMENTS. 
Mn ula Sex DI 'ToTAL TAIL Hinp EAR FROM 
: i y LENGTH. | VERTEBRÆ.| Foor, Norcu. 
8443, type | ĝ adult | May 8 480 25 102 38 
8444, topotype | QM April 22 460 22 100 38 
, e: | e BELA 465 22 102 37 
8446. “ |,g ^ “ 21| 510 3o 105 38 
$45, Y | ii i 26 485 20 97 35 
Bo. .* | d dnd Uc og 420 20 96 33 
NOTE. — All external measurements are the collector's. Hind foot is measured 
with the claw. 
Skull, basal length, 85.4 ; occipito-nasal length, 98.6 ; zygo- 
matic width, 44 ; mastoid width, 32 ; least interorbital width, 
26.2; length of nasals, 38 ; width of nasals, 15.4; length of 
palate, to palatal notch, 39 ; to end of pterygoid, 55.4; upper 
tooth row (with four molar-form teeth in place), 17.2 ; greatest 
width of rostrum, 24 ; length of single half of mandible, 58 ; 
lower tooth row (with four molar-form teeth in place), 18.8. 
Remarks. — The six specimens were all shot by Mr. Brown 
among mangroves, the leaves of which they are very fond of. 
The animal is much hunted by the negro pearl divers, and is 
exceedingly shy and wary, and for some time Mr. Brown was 
unable to secure one. One day during a storm he noticed 
that when a mangrove blew over it was at once stripped of its 
leaves by the agoutis. Acting upon a plan that this habit of 
the animal suggested to him, he took several large stones with 
him, and concealed himself in a tree. After a little he sent a 
stone crashing through the mangroves and presently saw an 
agouti cautiously approach the spot, thinking a mangrove 
had fallen over. The first day he shot two specimens in this 
way, and afterwards four more. 
