624 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY-GENERAL REPORT. 
D. octo-einctus, Linn. (D. uroceras, Lund.) Medium sized species, with eight molars, eight bands, and tail somewhat shorter 
than the body, and enveloped at the tip in a horny sheath. 
D. septem-cinctus, Linn. (D. hybridus, Desm.) Smallest species, with seven molars, seven bands, and tail much shorter than 
the body. Inhabits Paraguay and Patagonia. 
The Texas species is as large as the D. novem-cinctus of the above diagnoses, and has the tail, 
in the young, as long as the body, exclusive of the head ; in the adult, as long as the body 
and half the head. It has eight free bands on the median line of the back, and nine on 
the sides. The tail has twelve free whorls, the tip plaited, but not enveloped in a sheath. 
The molars are eight on each side of each jaw. These characters are remarkably constant in a 
considerable number of specimens. There is, therefore, a good deal of uncertainty as to the 
species, which can only be settled by critical comparisons of a large amount of material from 
different localities. A single shell from Brazil has nine free bands on the back, and is other¬ 
wise quite different from the Texas armadillos. 
List of specimens. 
‘ This skull measures 4.07 inches by 1.65. 
