124 BULLETIN 43, UNITED STATES NATIONAL MU.SEUM. 



long or slightly longer tliau the lioad; second interspace without pig- 

 ment. Predigital line absent in fonrtli interspace, as a rule. The nerve 

 may arise from angle as in A.fnscus. Very rarely on one side only is 

 the arrangement as in Vespertilio. Transverse lines of the interfemoral 

 membrane numerous, regular, furnished with minute dots which 

 are hairy. Post-calcaral lobe absent. Foot one-fourth the length 

 of the forearm. Tip of coracoid furnished with two coequal processes. 



Descripilon. — Ear oval with slightly convex anterior sinuate, or 

 straight outer border and blunt tip. The internal basal lobe much 

 longer than high, as in Adelonycteris. The external basal lobe begins 

 at the pilwse post-rictal wart as a low skin-fold. Gradually it becomes 

 higher, and at the posterior half is a thickened nodule with an inclina- 

 tion to incurve on the concavity of the auricle. The second scallop 

 (hem) is larger than the external basal lobe. The external basal 

 ridge ends on the border of the ear in a thickened convex border (first 

 scallop) which extends one-half the height of the ear. It is followed 

 by a shallow emargination, above which underlies the blunt tip. The 

 tragus is erect, with blunt tip and straight inner border. The outer 

 border is wider just above the well-defined notch than elsewhere and 

 is slightly convex. The basal lobe is rounded and diverted forward. 



The face more hairy than in A. fuscus and less blunt at the snout, which 

 is scarcely, if at all, concave on the outer border. (No. G0S8 U. S. IST. M.) 

 The fur of the back dark brown, almost black at basal half, apical 

 half abruptly contrasted to base as being pallid, dull yellow, or light 

 chestnut, the last-iiamed hue predominating, the extreme tip again 

 darker sienna, though of lighter shade than the base. The fur of the 

 venter the same as that of the back', but without dark tips. A harmony 

 exists between the colors of the two sides ; thus, when the back is dull 

 yellow the venter is of the same color, and so for each of the shades; 

 the hair on the membranes unicolored. In specimen No. 4979 S. I., 

 Woburn, Mass., the dark tip to the fur, especially on the dorsum, was 

 so long as to give a somber cast to the entire pelage. In new examples 

 from Bee County, Tex. (Nos. 3482 and 3483, Am. Mus.), this character- 

 istic was particularly well marked and suggested the style of colora- 

 tion seen in Atalajyha. The hair on the membrane on the dorsal aspect 

 covered the proximal third of the arm, and extended thence on the 

 membrane outward to a line answering to the knee; hence the mem- 

 brane is curved for a greater distance than would be indicated by the 

 extent to which the humerus is covered. The species is distinctive in 

 the entire thigh being hairy. The interfemoral membrane is hairy at 

 its basal half and of a uniform iron-rust hue. The haired surface in- 

 cludes the proximal half of the tibia. 



On the ventral aspect the membranes are furred at the proximal 

 third of the humerus, and thence as a sparse thin growth in tJie inter- 

 val between the elbow and the knee. The interfemoral membrane is 

 heavily furred below the pubis, and very sparcely so on the transverse 



