A MONOGRAPH OF THE BATS OF NORTH AMERICA. 37 



Variations. — The distaure between the tail and the tip of the calcar 

 is inconstant. The sides of the interfenioral nienibiane do not always 

 end at precisely the same level on the tail. 



The basal i)art of the nose-leaf may be separated from the ascending 

 part by a snlcns in the manner seen in Artihciis ;ind I'hyllostoma. The 

 lower margin may be separated from the groove to the outer side of the 

 lateral margin. 



Manal formula. 



Immature 

 44mm long. 



Secoml interspace 

 Third interspace . . 

 Poiirth interspace 

 Forearm 



Skull. — The brain case is raised much above the level of the face. The 

 sagittal crest is defined, except on the metencephalon, where, excepting 

 at the extreme tip of the angle between the vertex and the occiput, it is 

 absent. No convexity exists over the region of the proencephalon, which 

 measures one-eighth of the length of the brain case. The region of the 

 metencephalon measures one-third of the length of the brain case. The 

 tympanic bone is large, almost entirely concealing the cochlea. The 

 basi-occipital bone is without lateral fossa\ The lingual process of the 

 sphenoid bone is rudimentary or absent. The posterior temporal impres- 

 sion is deflected from the sagittal line at metencephalon to define with 

 the aid of the fellow of the o])posite side a large, triangular, convex space. 

 The face vertex is markedly inflated at the side for the greater part of 

 its length; a median ridge extends over the anterior two-thirds, the 

 posterior thirds being depressed; on each side of the median line a 

 small foramen, which transmits a nerve to the auricle, is seen. On 

 the side the inftation occupies the greater part of the superior maxilla 

 and causes the region of the infraorbital foramen to be slightly de- 

 pressed. The anterior border of the orbit is trenchant. The ectoturbi- 

 ual ])lates show through the frontal bone as it forms the orbital inner 

 wall; a small foramen is seen near the rhinencephalon Ijing below an 

 oblique ridge. The ui)per border of the malar bone is incised at the 

 middle third. A liiu^ ])roduced from the ui)per border of the anterior 

 nasal aperture intersects the middle of the first upper premolar. The 

 inner surface of the ascending ramus of the lower jaw is furnished with 

 a ridge which extends fin^ward on a line Avith the teeth. The condyle end 

 reaches the aveolus. The angle is narrowed, curved, and tapering at the 

 tip ; it projects posteriorly beyond the condyle to the outer third of which 

 it lies as the bone is viewed from above. The distance from the con- 

 dyle to the ti}) of the corenoid is equal to the width of the horizontal 

 ramus. 



The cochlea in the PhyUostomida", as a rule, exliibits the loop of the 



