192 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Sigmodon iiispidus littoralis Chapman. 
8igmodon Iiispidus littoralis Chapman, Bull. Amer. mus. nat. 
hist., June, 1889, vol. 2, p. 118. 
Type locality. Oak Lodge, east peninsula, opposite Micco, 
Brevard County, Florida. 
Chapman’s cotton rat is a dark-colored form peculiar to the east 
coast of Florida, its range extending from about Miami north to 
northeastern Florida where it intergrades with 8. Iiispidus Iiispidus . 
Its range coincides closely with that of Geomys floridanus flori- 
danus , but extends farther to the south. All through central and 
western Florida it is replaced by A. Iiispidus Iiispidus and in 
extreme southern Florida by still another form, described below as 
subspecies 8. spadicipygus. 
It is extremely abundant and a great nuisance when one is trying 
to trap other animals, as it lives everywhere except in the denser 
hummocks. 8. Iiispidus littoralis differs in color widely from 8. 
Iiispidus Iiispidus , being nearly black above, very finely lined, gray 
or yellowish gray, in marked contrast to the brown upper parts of 
8. Iiispidus Iiispidus coarsely and irregularly varied with brownish 
black. The under parts of the two are quite as different, 8. litto¬ 
ralis being dull whitish below rarely washed with dull buff; 8. 
Iiispidus is much browner below, often strongly suffused with buff. 
I have specimens as follows: Florida: Miami, two; Jupiter 
Inlet, two; Oak Lodge, one hundred and eight; Micco, six ; Eau 
Gallie, one; Point Matanzas, three; Carterville, four; Anastasia 
Island, fourteen. 
Sigmodon iiispidus spadicipygus subsp. nov. 
Type from Cape Sable, Florida, 9 old adult, No. 4,477, collection 
of E. A. and O. Bangs. Collected, April 18,1895, by C. L. Brownell. 
General characters. Size smaller than 8 . Iiispidus Iiispidus or 
8. Iiispidus littoralis. Color different from either, the rump much 
more rufous; skull smaller, molar teeth smaller. 
Color. Upper parts finely mixed owing to the annulation of the 
hairs, brown (raw sienna to cinnamon), and black, the brown color 
predominating on face, cheeks, and sides; rump strong cinnamon- 
rufous, in marked contrast to rest of upper parts. Under parts dull 
