this larger size is indicative of intergradation with G. b. lutescens as represented by the specimens examined by us from Pueblo.

Our examination of an adult female, No. 128242 BS and a juvenal female, No. 128243 BS, from 15 mi. E Texline, Texas, recorded by Bailey (N. Amer. Fauna, 25:132, October 24, 1905) under the name Geomys lutescens reveals that the specimens are referable to Geomys bursarius jugossicularis instead of to Geomys bursarius major on the basis of (1) mastoid part of tympanic bulla more inflated posteriorly, (2) narrowness of frontals between posterior tongues of the premaxillae and, (3) lighter color.

Liomys irroratus irroratus Gray

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

When Bole (Sci. Publ. Cleveland Mus. Nat. Hist., 5(2):6, December 4, 1937) named and described Perognathus longimembris salinensis, he listed as comparative material of P. l. bangsi, a specimen in the Museum of Comparative Zoology from Parker, Yuma Co., Arizona. There was some reason to doubt the identification of the specimen since it is the only record of occurrence of the subspecies from east of the Colorado River. There is no specimen of Perognathus longimembris from Arizona in the Museum of Comparative Zoology. There is one specimen of pocket mouse (18213, a skin only) from 30 miles east of Parker. We think that this is the specimen seen by Bole because at one time according to the label, it had been identified as Perognathus panamintinus [= longimembris] bangsi. If the identification of this skin-only had been made by means of Osgood's key (N. Amer. Fauna, 18:14-15, September 20, 1900), the animal would have "keyed out" to P. longimembris because the total length is recorded on the label as 130. Seth B. Benson has subsequently examined the specimen. The label now bears in handwriting the name of P. amplus pergracilis and is followed by Benson's initials as the identifier. Although we lack adequate comparative material, we consider the specimen to be P. amplus pergracilis Goldman, because the skin answers well to the description of P. a. pergracilis and because of the name currently on the label with Benson's initials.

Perognathus longimembris panamintinus Merriam

In the current literature, Californian specimens of the little pocket mouse stand identified as Perognathus longimembris nevadensis from Oasis and vicinity of Benton Station (Grinnell, Univ. California Publ. Zool., 40:147, September 26, 1933). When one of us (Hall, Mammals of Nevada, p. 360, July 1, 1946) reported specimens from southwestern Nevada as Perognathus longimembris panamintinus he did so on the basis of study of specimens which included those from Oasis (in the California Museum of Vertebrate Zoology) that he at that time (in ms.) identified as P. l. panamintinus. Those specimens from Oasis have the hair on the underparts white all the way to the base as also do specimens from Morans, 5000 ft. (29583/41638 BS), in contrast to the plumbeous underparts of P. l. nevadensis. It is on this basis that we identify specimens from the places mentioned above as Perognathus longimembris panamintinus. "Vicinity of Benton Station" as given by Grinnell (loc. cit.) is interpreted to include Morans, Mono County.

Dipodomys agilis martirensis Huey

Elliot (Field Columb. Mus., Zool. Ser., Publ. 79, 3(12):221, August 15, 1903) referred specimens from Rosarito and Rosarito Divide, San Pedro Mártir Mts., Baja California, to Perodipus [= Dipodomys] agilis. According to the currently known distribution of Dipodomys agilis in Baja California (see Huey, Trans. San Diego Soc. Nat. Hist., 11:237, April 30, 1951), the specimens seemed likely to belong to the subspecies D. a. martirensis. An examination of the specimens (10644, 10690-10693 CMNH from Rosarito, and 10694 from Rosarito Divide) shows that, on the basis of large ear and comparatively narrow braincase, they are in fact referable to D. a. martirensis. Only No. 10693, with its broader braincase, seems atypical. Comparative materials used are in the Chicago Natural History Museum as follows: D. a. martirensis: Baja California: San Matias Spring, 2. D. a. simulans: Baja California: Ensenada, 8. California: Dulzura, 1 (topotype); San Luis del Rey, 3.

Dipodomys agilis simulans (Merriam)

J. A. Allen (Bull. Amer. Mus. Nat. Hist., 5:184, August 18, 1893) listed as Perodipus agilis a specimen (6306/4941 AMNH) from Valladares, Baja California. Subspecies of this species were subsequently named without mentioning this specimen that, on geographic grounds, might be either D. a. martirensis or D. a. simulans. Certain measurements of the specimen are as follows: Total length, 288; length of tail, 171; length of hind foot (dry), 41.0; greatest length of skull, 39.5; width of maxillary arch at middle, 4.5. The long tail and wide (4.5) maxillary arch are characteristic of Dipodomys agilis simulans and constitute the basis