90 Merriam — Rediscovcni of the Mex-'ican Kangaroo Bat 



as Saccoj)}iorus, Sacconnjs, and Iletrromyf, with large cheek-iiouclies, whicli 

 o])en externally on the side of the cheeks. T propose to call it 



" r^ipndomiju. 



" Body covered with soft hair. Head moderate, with large cheek- 

 pouches opening externally on the side of the cheeks. Ears and 

 eyes rather large; the fore-legs short; the hind tarsus long and 

 slender; the hind feet very long; the soles covered with hair; 

 toes 5-4. The tail much longer than the body, covered with 

 rather short hair, and with a dilated brush at the enci ; the upjier 

 cutting teeth grooved in front. Grinders — (?) 

 " This genus difFei's from all those above cited in the tail being elongated 

 and covered with hair, with a i^encil at the ends like the Gerboas, and 

 from Saccomys in the soles of the hind feet being hairy. 



^^ Dipodomys plullip'n Gray. 



" Gray-brown, with longer black hairs ; sides sandy; sides of the no.se, 

 sjiot near the base of the ears, band across the thigh and beneath, 

 pure white ; nose, spot at the base of the long black whiskers, and 

 at the base of the tail, black ; tail black-brown, with the band on 

 each of its sides and tip white; penis ending in a long spine- 

 Length : body and head, 5 inches; tail, 6.} inches; hind feet, l-l 

 inch. 



" Inhab. Mexico, near Real del Monte. John Phillips, Esq." (J. E. 

 Gray, Annals and Magazine of Natural History, vol. vir, No. 46, August, 

 184], pp. 521-522.) 



By a fortunate circumstance Gray's type specimen was figured 

 by Audubon in his colored plate (No. cxxx), Avhich plate has 

 the additional merit of tallying with the description and also 

 with the specimens collected by ]Mr. Nelson.* 



The measurements given l)y Gray (and repeated l)y Audubon) 

 are: Head and l)od3^ 5 inches ; tail, Hi inches; hind feet, 1^ 

 inches. Converted into millimeters, tlie length of the tail is 165, 

 and of the hind foot 38. The averages of these measurements 

 in r)4 s[)ecimens collected by ^Ir. Nelson are: Tail, 167.5; hind 

 foot, 41. In several individuals the hind foot fell to 39 nnn. 

 iSIr. Nelson's measurements were taken in the flesh, which ac- 

 counts for the slight dift'erence in the length of the hind foot. 



* Audubon states: "Our drawing was made from a beautiful si^ecimen 

 in the British Museum, which was the first one brought under the notice 

 of naturalists, and the original of Mr. Gray's description of this singular 

 animal ; it was procured near Real del ^lonte, in ^Texico." ((Juadrni>eds 

 of North America, vol. ni, 1854, 140.) 



