E. Raymond Hall

“ The color is lighter than in the average of specimens from the mainland (for instance those from Victoria and Soto la Marina) but can be matched by selected specimens. In animals of equal age, the hind foot and basilar length are shorter in S. h. solus than in berlandieri. The broadening of the rostrum, which occurs with advanced age, is attained in solus when the skull is yet short; the maximum breadth of the rostrum in the adults is more, instead of less, than a fourth of the basilar length. ”

“ Color paler on pigmented areas; white areas more extensive; skull averaging smaller except in basilar length and length of nasals which are approximately the same as in D. o. sennetti. From Dipodomys ordii compactus True of Padre Island, D. o. largus differs in: Body longer; tail shorter; skull narrower across tympanic bullae and across maxillary processes of zygomatic arches; nasals shorter. From Dipodomys ordii parvabullatus of the coastal island south of Padre Island, along the gulf coast of Tamaulipas, D. o. largus differs in: Body and tail longer; basilar length of skull averaging less ”

“ Fauna, 29:129, 1909) may not reveal the full measure of difference in size between L. c. curti and other subspecies because Nelson (op. cit.) pooled males and females in obtaining the average measurements that he records. For example, he used three males and two females of Lepus altamirae in obtaining an average (op. cit.:117) . The specimens of L. c. curti here recorded are thought to be of full size inasmuch as the degree of fusion of bones in the skull, and the density of the cranial bones indicate full adulthood for each specimen. Reproductive-wise, there is no question as to adulthood ”

“ The crabs and worms conceivably are two of the environmental features inhospitable to the rats.
Specimens examined.—Total, 14, all from Tamaulipas, Mexico, as follows: 88 mi. S and 10 mi. W Matamoros, 7; 90 mi. S and 10 mi. W Matamoros, 7.
When Setzer (Univ. Kansas Publ., Mus. Nat. Hist., 1:473–573, December 27, 1949) reviewed the subspecies of Dipodomys ordii he lacked specimens of Dipodomys ordii compactus from the type locality or from anywhere else on Padre Island. He used as representative of D. o. compactus specimens from Mustang Island, Texas, the island next northeast of Padre Island. ”

“ Incipient tidal inlets were frequent; they were where storm-driven waves of high tides had broken across the island between the adjacent ends of two dunes. The windward side of a dune was toward the Gulf and the slope of that side was gentler than that on the leeward side. According to the cycle described by Davis (Proc. Amer. Acad. Arts and Sciences, 22:303–332, 1896) and recently figured on page 364 by Lobeck (Geomorphology, 1st ed., xii + 731 pp., 1939, McGraw Hill Book Co., Inc., New York) the barrier beach concerned was in the early part of the "Middle Youth Stage". ”

“ Specimens examined.—Two from the type locality.
Lepus californicus curti new subspecies
Black-tailed Jack Rabbit
Type.—Female, adult, skull and skin, No. 35470, Mus. Nat. Hist., Univ. Kansas; from island, 88 miles south and 10 miles west of Matamoros, Tamaulipas, Mexico; obtained 19 March 1950 by E.R. Hall; original No. 6783.
Range.—Islands along coast of Tamaulipas, Mexico.
Diagnosis.—Color pale; size small; ears short; tympanic bullae small. ”

“ Soc. Washington, 55:25–26, May 12, 1942) that the californicus group should be divided into two groups (each group possibly amounting to something more than a species and something less than a subgenus) on the basis of a white rump and complex infolding of the enamel layer of the front of the first upper incisor versus a dark rump and simple infolding of the mentioned layer of enamel. ”