4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 56 



tibia, 17 ; ear from notch, 13 ; tragus from notch, 6.7 (from dry skin). 

 Skull: Condylobasal length, 13.7; breadth of braincase, 8.0; interor- 

 bital breadth, 4.4; upper tooth row, including canine, 5.4. 



Remarks. — This bat is immediately distinguishable from any species 

 known from the United States and Canada by the peculiar high and 

 inflated braincase and apparent shortness of the rostrum. The color 

 is even slightly darker than the darkest skins of M. I. alasccnsis and 

 M. y. satiiratns that I have seen. It is slightly larger than M. kecnii, 

 with smaller ear and tragus. The species is based upon a single 

 specimen. 



MYOTIS PERNOX, sp. nov. 



Type from Henry House, Alberta. Cat. No. 174 134, U. S. National 

 Museum; skin and skull, adult male. Collected September 6, 191 1. 

 J. H. Riley; original No. 2318. 



General characters.- — A dark brown Myotis, externally resembling 

 M. lucifugns hicifugus, but with larger foot. Interfemoral mem- 

 brane edged with scattering hairs. Skull differs from that of luci- 

 fugus in its larger size and more depressed braincase. 



Color of type. — Upperparts uniform glossy brown, nearest to the 

 bistre of Ridgway ; underparts dark Isabella color ; ears and mem- 

 branes blackish. 



Skull and teeth. — The skull is essentially like that of M. lucifugns 

 lucifugns, except that the size is greater, and the braincase is much 

 flattened. The ventral surface, including the teeth, presents much the 

 same appearance, except for size, as does that of lucifugns. 



Measurements. — Type and topotype, the latter in parentheses : Head 

 and body, 53 mm. (54) ; tail vertebrae, 39 (44) ; hind foot, 11 (12), 

 measured in flesh by collector. Forearm, 37.7 (38.6) ; tibia. 16.7 

 (17) ; ear from notch, 12.5 (12.2) ; tragus from notch, 7.6 (8.0), from 

 dry skin. Skull : Condylobasal length, 14.8 (14.9) ; breadth of brain- 

 case, 8.0 (8.0) ; interorbital breadth, 4.1 (4.2) ; upper tooth row, in- 

 cluding canine, 5.5 (5.7). 



Remarks. — This bat might, from external examination, be readily 

 mistaken for M. lucifugns lucifugns, but the characters of the skull 

 will at once distinguish it. The black ears and membranes also serve 

 to separate it ; M. I. lucifugns has brown wings and interfemoral mem- 

 brane. Two specimens of this species, both males, were collected the 

 same evenine. 



