110 Proceedings of the Biological Society of Washington. 



showing two closed triangles). Soles partially naked, bearing five pads — 

 four at the bases of the toes, and a large metatarsal pad, elliptical in 

 shape, situated about midway between the heel and the base of the toes;* 

 tail slightly flattened, full and bushy, narrowing decidedly towards the 

 tip; ears large, subtriangular in shape, more acutely pointed than in 

 either Glaucomys or Pteromys. 



Remarks. — The genus, so far as known, is monotypic. In external 

 appearance it bears no close resemblance either to the American Glauco- 

 mys or to the small Palaearctic flying squirrels of the genus Pteromys, 

 being readily distinguished from either by the characters of the soles, as 

 well as by large size and bushy, tapering tail. In cranial characters, the 

 resemblance to Glaucomys is certainly striking, as Mr. Thomas has 

 pointed out,t but in assigning the animal to the latter group, he evidently 

 overlooked the important structural differences in the anterior premolar 

 and in the plantar tubercles. 



Qlaucomys volans saturatus subsp. nov. 



Type from Dothan, Alabama; adult female, No. 178,366, U. S. Nat. 

 Mus. ( Biological Survey collection); collected March 13, 1912, by A. H. 

 Howell; original number 1960. 



Characters. — Similar in size and skull characters to volans, but upper- 

 parts darker at all seasons ; toes not conspicuously whitened in winter. 

 Compared with querceti: Upperparts darker, face grayer (less buflfy), hind 

 feet grayer (less brownish), and audital bullae smaller. 



Measurements. — Average of 12 adults from southern Alabama: Total 

 length, 226; tail vertebrae, 100; hind foot, 30. Skull (of type): Greatest 

 length, 34.9; zygomatic breadth, 20.4; mastoidal breadth, 17.4; inter- 

 orbital breadth, 7.2; length of nasals, 9.5; alveolar length of maxillary 

 tooth row, 6.5. 



Remarks.— This dark race of volans occupies the Gulf States, excepting 

 Florida and Texas (and perhaps Louisiana), extending north to eastern 

 Tennessee and western North Carolina and west to Arkansas and Okla- 

 homa. It differs in color from all the surrounding races and from 

 querceti and texensis also in skull characters. 



Glaucomys volans texensis subsp. nov. 



Type from 7 miles northeast of Sour Lake, Texas. Adult male, No. 

 136,400, U. S. Nat. Mus. (Biological Survey collection); collected March 

 15, 1905, by J. H. Gaut; original number 3480. 



Characters.— ShmlsLT in size and color to volans; upperparts slightly 

 more ochraceous and toes without conspicuous white markings in winter ; 

 skull decidedly shorter and relatively broader. Compared with saturatus: 

 Colors much paler; skull shorter and broader. Compared with querceti: 

 similar in color, but skull shorter, with smaller audital bullae. 



• A small, circular, supplementary tubercle appears in some specimens on the outer 

 side of the sole, directly posterior to the pad at the base of the fifth digit. 

 + Ann. & Mag. Nat. Hist. (Ser. 8), 1. 1908, p. 6. 



