DASYPROCTA. 407 
15.4; length of palate to palatal notch, 39; to end of pterygoid, 55.4; 
upper tooth row (four molar teeth), 17.2; greatest width of rostrum, 
24; length of single half of mandible, 58; lower tooth row (four molar 
teeth), 18.8. 
424. isthmice (Dasyprocta), Alston, Proc. Zodl. Soc., 1876, p. 347. 
IsTHMIAN AGOUTI. 
Type locality. Colon, Columbia. 
Geogr. Distr. Unknown, probably Costa Rica to Columbia. 
Genl. Char. Long hairs of rump black, with broad pale tips. 
Color. ‘‘Fur ringed with black and yellow; rump black more or 
less washed with orange or yellow, the long hairs being black at the 
base, scarcely annulated except close to the tips, which are broadly 
margined with the light color.”’ 
Measurements. ‘‘Total length about 22 inches; hind foot, 4.25 
inches.’’ (Alston, 1. c.) 
425. coibxe (Dasyprocta), Thomas, Novitat. Zodl., rx, 1902, p. 136. 
Co1spa AGoUTI. 
Type locality. Coiba Island, West Coast of Panama. 
Genl. Char. Size as in D.1sthnuce; fur coarse, sparse; rump 
hairs about three inches in length; nasals parallel, not tapering. 
Color. Upper parts grizzled brown; hairs ringed with brown and 
orange; rump hairs broadly tipped with orange; crown blackish 
brown; under parts soiled yellowish; upper surface of feet black; 
tail naked for about an inch; ears nearly naked, brown. 
Measurements. Head and body, 570; tail, 25; hind foot, 105; 
with hoofs, 115; ear, 32. Skull: basilar length, 78; zygomatic 
breadth, 53; nasals, 40 X 24; interorbital breadth, 32; palatal length, 
38.5; diastema, 26.5; length of palatal foramina, 4.2; length of bulle, 
15.2; length of upper molar series (crowns), 16. 
426. cristata (Cavia), Desm., Nouv. Dict. Hist. Nat., 1, 1816, p. 213. 
antillensis, Sclat., Proc. Zodl. Soc.. 1874, p. 666. 
CRESTED AGOUTI. 
Type locality. “‘Surinam.”’ Probably a West Indian form. 
(Alston.) 
Geogr. Distr. Islands of St. Vincent, St. Lucia, and St. Thomas, 
West Indies. 
Genl. Char. Nuchal crest present; colors dark. 
Color. Hairs ringed with black and reddish or brownish yellow; 
nuchal tuft and rump black, with hairs ringed at base. 
Measurements. Total length, 450; hind foot, 93.75. 
