SACCOMYIDiB— rEUOGNATniDINVB-CltlCBTODIl'UB. 



51 r> 



by Mr. E. R. Alston, from exnminntion of thn originnl sppcimon, Uindly 

 inntlc nt my request, Mr. Alston writes : — " The typeof 'Abromys lordi' is 

 in bad condition, the ears being hopelessly distorted ; but it seems to me 

 to be undoubtedly P. monticolu." 



PEROONATHUS HICOLOR, Gray. 



Hondnrai Focket-monse. 



rirognathiu Mcalor, Gray, P. Z, 8. 1866,803. (Hoiiiluriia. Dmcriptlon oonfiinml with that of a upeoios of 

 Iltitromf — fttto AUTtiN, epkt.) 



Though not an inhabitant of North America as zoologically understood, 

 this species is introduced to complete an account of the genus, and to furnish 

 the occasion for correction of an important error into which the describer 

 was led. The original notice is subjoined.* 



Mr. Alston writes me, afler examination of the type : — " P.bicolorOrny, 

 (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 hod both this specimen and his Heteromys melanoleucus in his hantls 

 when he wrote, and to have confused one with thq other." 



Gekus CRICETODIPUS. Baird. 



= T Crictiodipin, Tralk, U. 8. Expl. Expod. 1848, SB. (Type T) 



= Crlc'eHptii, Baihd, H. N. A, 1858, 4 18. (Type Ptrugaalhu* fiaviu.)—Otixr, P. Z. 8. ISCS, 303.— CoDBS, 



Proo. Phila. Acad. 1875, 300. 

 = OlognoiU, CouKS, Proo. Pbila. Aoail. 1875, 305. (ProvisloDal unme. Type Perognathm flaviu.) 



In treating of this form as a subgenus of Perognalhus, Professor Baird 

 clearly showed its external peculiarities, namely, absence of lobation f)f 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 Ptirognathus. The characters having already been 

 given (p. 496), it is needless to repeat them. 



* " PbroonatIius bicolor, B. H. 



" Ptroffnatkiu monUeola, OerMrd, Cat. Ronea B. H. (not Baird). Black; npper lip, lower edge of 

 the oboek-poocb, head, and ander side of body and ioner aide of limba white. Fur uniform bristly ; 

 bristles olungatu, slender, wiih a slender point, and intermixed with very slendrr elongated hairs. Tail 

 as long aa the body, with rings, sqnare scales, and short bristly hairs. 



" Hob. Honduras (SalU). 



" There is a 8piny Rat from Hoodnras * with a longer tail and smooth frontteeth, agreeing in color 

 with the above." Tho confusion of ideas intimated by Mr. Alston is here obvious. 



* CbsruterlSMl on p. 904 of the P. Z. 8. for IMS m Btltntimt mtlanaUittiu, with " Ferofiuithiu muotieolor [slol, 

 Qemird, B. M not 8 B«ltd ", quoted m ■ Bynonym. 



