A MONOGRAPH OF THE BATS OF NORTH AMERICA. 77 



iiVesperuf/o or All Adelo7iycteris, which have '"iiofiilso molars above and 

 but one below" is in direct testimony that this writer treated the last 

 premolar as a molar and the smaller premolars as " false molars." The 

 language implies the same as the modern expression that there are two 

 minute i)remolars in each jaw in the Vcspvrtilio and but one minute 

 premolar in the lower jaw oi Adelonycteris. 



The following embraces the salient points in Temmiiick's account of 

 the coloration in V.caroli: "Jcmes, cotes du con et toutes h's parties 

 superieures d'un brune-roussatrea base des poils noire; en dessous d'un 

 blauc jaunatre 51 la pointe et brun-fonce a. la base." 



Dlaffnosis. — Subacuminate, tapering ears. Interfemoral membrane 

 below the level of the ankles triangular; tip of tail exsert; penis large, 

 with distinctly expanded but concealed glans; prepuce never i^igmeu ted. 

 Lateral maxillary incisor disposed to outward rotation, almost always 

 Avith crenulated cingulum. The face broad, from 9'" to 10'" between the 

 ears, and, owing to the presence of large nmzzle- glands, giving the region 

 in front of the eyes a swollen appearance. A sui)ralabial groove not 

 distinctly inclines toward the mouth anteriorly; gape of mouth rarely 

 extends back beyond the internal canthus. The tragus is slender and 

 pointed; theinner border is straight, with the outer border inclined out- 

 ward, thus forming two sides of an isosceles triangle. Above the notch 

 the tragus is falciform and turned outward. Itis rarely crenulate on the 

 outer border. Membranes incline to be brown above (never black ex- 

 cepting in the lucifugan variety) and gray with tawny shades below. 

 The hair on the dorsum of the interfemoral membranes ends abruptly 

 at the level of the knees. Manal formula variable. The following are 

 expressions of it : 



First interspace ) „, 



Second interspace | . ^ 



t n't 

 Third interspace ] .^^ 



Forearm \i. 



I 3» 



Description. — The auricle is elongated, Avith slightly acuminate in- 

 ternal basal lobe, and moderately convex anterior border and rounded 

 tip. The external border directly below the tip and for a short dis- 

 tance is emarginate. The first scallop is distinct; the second indistinct, 

 and the ridges are scarcely developed. The external basal lobe is 

 rounded, small, incurved as a rule, thickened, and broader than high. 

 The internal and external basal lobes lie near together, while the two 

 borders of the auricle lie far apart. Hence tlu' form of the ear is that 

 of an oval, the lower external part being concealed by hair. IJotli 

 sides of the auricle in well-preserved examples are marked by numer- 

 ous laised arborescent lines; no transverse plicae, such as .ire often 

 conspicuous in the ears of ])ats, are here, as a rule, noticeable. 



The tragus is acuminate, the anterior border straight, the external 



