When Hooper and Handley (Occas. Papers Mus. Zool., Univ. Michigan, 514:1-34, October 29, 1948) published a revised map (_op. cit._:3) showing the geographic distribution of the subspecies of _Liomys irroratus_ they did not mention a specimen from Agusinapa, Guerrero, which inferentially from their map would be _L. i. irroratus_ although it previously had been recorded as _L. i. torridus_ by Goldman (N. Amer. Fauna, 34:55, September 7, 1911). We have examined the specimen (70228 BS), which retains the upper deciduous premolar. Its long foot (32 mm.) and broad cranium (13 mm.) are the bases for identifying the specimen as _Liomys irroratus irroratus_ instead of _L. i. minor_, which is smaller. ~Liomys irroratus minor~ Merriam When Hooper and Handley (Occas. Papers Mus. Zool., Univ. Michigan, 514:1-34, October 29, 1948) published a revised map (_op. cit._:3) showing the geographic distribution of the subspecies of _Liomys irroratus_ they did not mention five specimens from Tlapa, Guerrero, which inferentially from their map would be _L. i. irroratus_ although these specimens previously had been recorded as _L. i. torridus_ by Goldman (N. Amer. Fauna, 34:55, September 7, 1911). We have examined the five specimens (70221-70225 BS), three of which retain the upper deciduous premolars and two of which have the upper fourth premolar unworn. The short, wide rostrum is unlike the long slender rostrum of topotypes of _L. i. torridus_ of comparable age, and agrees with the condition in topotypes of _L. i. minor_ of comparable age. It is on this basis of wider rostrum that we refer the five specimens from Tlapa to _Liomys i. minor_ which Hooper and Handley (_op. cit._:13) described as differing from the geographically adjacent _L. i. irroratus_ in "short and strongly tapered rostrum." We would add that we have not independently verified this difference between _L. i. minor_ and _L. i. irroratus_ for want of specimens of _L. i. irroratus_ comparable in age to the five individuals from Tlapa. The map of Hooper and Handley (_loc. cit._) inferentially excludes Tlalixtaquilla, Guerrero, from the geographic range of _L. i. minor_ (and places Tlalixtaquilla within the range of _L. i. irroratus_) although Goldman (_op. cit._:56) previously had identified specimens from this place as _L. i. minor_. Our examination of the two immature specimens (70227 and 70230 BS) from Tlalixtaquilla reveals that they closely resemble the holotype of _L. i. minor_ and leads to the conclusion that they are _Liomys irroratus minor_. ~Perognathus amplus pergracilis~ Goldman