s 
SACCOMYIDAZ—PEROGNATHIDIN &—CRICETODIPUS. pla 
by Mr. E. R. Alston, from examination of the original specimen, kindly 
made at my request. Mr. Alston writes :—‘ The type of ‘Abromys lordi’ is 
in bad condition, the ears being hopelessly distorted ; but it seems to me 
to be undoubtedly P. monticola.” 
PEROGNATHUS BICOLOR, Gray. 
Honduras Pocket-mouse. 
Perognathus bicolor, Gray, P. Z. S. 1868, 202. (Honduras. Description confused with that of a species of 
Heteromys—teste ALSTON, epist.) 
Though not an inhabitant of North America as zodlogically understood, 
this species is introduced to complete an account of the genus, and to furnish 
the occasion fur correction of an important error into which the describer 
was led. The original notice is subjoined.* 
Mr. Alston writes me, after examination of the type :—‘‘ P. bicolor Gray, 
(from Honduras,) appears to be a good species, but has been curiously 
badly described. It is dark brown above, not black, and tho’ the fur is 
sparse and somewhat harsh, it is not in the least bristly! Gray seems to 
have had both this specimen and his Heteromys melanoleucus in his hands 
when he wrote, and to have confused one with the other.” 
Genus CRICETODIPUS, Baird. 
=? Cricetodipus, Prax, U.S. Exp]. Exped. 1848, 52. (Type ?) 
= Cricetodipus, Barrp, M. N. A. 1858,418. (Type Peregnathus flavus.)—GRay, P. Z. 8. 1868, 202.—CovugEs, 
Proce. Phila. Acad. 1875, 300. 
= Otognosis, Couns, Proc. Phila. Acad. 1875, 305. (Provisional name. Type Perognathus flavus.) 
In treating of this form as a subgenus of Perognathus, Professor Baird 
clearly showed its external peculiarities, namely, absence of lobation of the 
‘antitragus, hairy soles, and diminutive size. To these points are to be added 
the cranial peculiarities coincident with decidedly greater development of the 
mastoid than that seen in Perognathus. The characters having already been 
given (p. 496), it is needless to repeat them. 
*“ PEROGNATHUS BICOLOR, B. M. 
“ Perognathus monticola, Gerrard, Cat. Bones B.M.(not Baird). Black; upper lip, lower edge of 
the cheek-pouch, head, and under side of body and inner side of limbs white. Fur uniform bristly ; 
bristles elongate, slender, with a slender point, and intermixed with very slender elongated hairs. Tail 
as long as the body, with rings, square scales, and short bristly hairs. 
“ Hab. Honduras (Sallé). 
“There is a Spiny Rat from Honduras* with a longer tail and smooth front teeth, agreeing in color 
with the above.” The confusion of ideas intimated by Mr. Alston is here obvious. 
«Characterized on p. 204 of the P. Z. S. for 1868 as Heteromys melanoleucus, with ‘* Perognathus monticolor [sic], 
Gerrard, B. M. not S. Baird", quoted as a synonym. 
