68 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



Skull— The sagittal temporal crest is high and conspicuous over the 

 mesencephalon and rudimentary over the metacephalon and proenceph- 

 alou. A distinct convexity lies over the proencephalou. The an- 

 terior temporal crests are well defined. A tubercle lies at the basal 

 end of each crest. From this tubercle forward the imperfectly defined 

 upper border of the simple inner orbital wall extends. The vertex of 

 the face is without nasal enunence; a groove extending from the be- 

 ginning of the sagittal temporal crest to the anterior nasal aperture. 

 The maxilla is without concavities. The anterior border of the vomer 

 corresponds to the middle of the first maxillary molar. The nasal 

 bones and the horizontal plates of the superior maxilliii advanced 2 

 millimeters beyond the vomer. Anterior nasal aperture incised. The 

 inner wall of the orbit is convex. The lachrymal foreamen is one-half 

 as large as the infraorbital. The infra-orbital foramen relatively large 

 and placed near orbit. The two parts of .the tympanic bone do not 

 unite but conceal the cochlea; the basisphenoid bone retains a nearly 

 vertical auditory process. The mastoid is smaller than the paroccipital 

 process. The sterno-mastoid impression is narrow, eh)ngate, not in- 

 tiated. The external semicircular canal is almost entirely, and the hor- 

 rizontal quite, covered with bone. The posterior and upper surfaces 

 are as in Atalapha. The apertures in the cranium by which the otic 

 capsnles approach the periphery are circumscribed. The inner bor- 

 der of the condyle of the lower jaw is produced, acumiiuite. The mas- 

 seteric impression is weak interiorly; the angle is broad and fiat, quite 

 unlike other vespertilionine forms excepting perhaps Harpiocephalus. 

 It lies in a line with the middle of the condyle and is therefore not de- 

 flected; the lower border of the fossa for the insertion of the tenqwral 

 muscle forms a ridge which is continuous with the line of the alveolus. 

 The ethmoid bone in this genus closely resembles that of other Vesper- 

 tilionida;. The ectoturbinal is compressed medio-laterally. 



N-otes on the skeleton.— Scapula: coracoid process turned forward at 

 tip. Axillary border markedly convex below impression for triceps 

 muscles. Humerus : epitrochlea projects horizontally, deflected down- 

 ward, and is flat and broad; lateral trochlea weak, scarcely defined; no 

 olecranon fossa. Carpus not distinctive: pisiform lies across palmar 



aspect. 



Penis with a cauliflower-like thickening to prepuce. 



EaUtat.—T\xe pale bat is found in California, Oregon, Cape St. Lucas, 

 Mexico and Arizona. It is abundant at Fort Yuma. E. Cones states 

 that it infests the houses and annoys the inmates by its scrambling about 

 the recesses in the walls and coping s. The naked muzzle has " a pe- 

 culiar livid hue in life, rendering the animal more repulsive andlorbid- 

 ding than is usual even in this family." 



