34 BULLETIN NO. VII. 



the pelage being plumbeous at the base. Below, either grayish 

 white or as above. On the head the hair is more lanuginous, 

 extending nearly to the nose. The wing membrane is not 

 furred. The skull is large, with a slight occipital crest; the 

 orbital space is large. Dentition i. J, c. |, ra. |x2=32. 



The first incisors above are much larger than the second and 

 are irregularly bifid, the internal cusp beir,g longest; canines 

 large, with a minute basal cusp; first molar narrow. The six 

 incisors of the lower jaw are crowded, tricuspidate. The two 

 anterior molars (premolars) simple. 



I have no notes as to the abundance of this species. 



The following description will apply to a male captured early 

 in June, and will illustrate the typical condition of the species 

 in Minnesota: 



Total length, 4.1; tail to anus, 17.4; expanse, 12.70; radius, 

 1.70; thumb, 0.25; first finger, 1.62; first phalanx second fin- 

 ger, 1.69; first phalanx third finger, 1.58; first phalanx fourth 

 finger, 1.50; tibia, 0.71; hight of ear medianly, 0.47; tragus, 

 0.30; hight of ear externally from base of opening, 0.65; ear 

 from nose, 0.70; eye from nose, 0.38; distance between nostrils, 

 0.15; tail beyond web, 0.20. 



General color yellowish brown, inclining to chestnut; below 

 lighter and more olivaceous; face, ears and web black, chin 

 and throat dark. Webs scarcely at all hairy. Cheeks tumid, 

 slightly warty; barbse fine, short; ears high, somewhat acute, 

 convex on the front margin; tragus over one- third the height 

 of ear, curved forward; basal lobe of ear of moderate size. 

 Thumbs small. Tail exserted; soles with a callous at the heel. 



GENUS LASIONYCTERIS. 

 (=Vesperides, Coues. ) 



This genus is characterized by the dental formula i. f , c. }-, 

 ra. |x2=36. Central upper incisors bicuspid. Skull rather 

 flat, not crested. Thumb rather small. 



Lasionycteris noctivagans LECONTE, SP. 



SILVER-HAIRED BAT. 



Vesperiilio noctivagans LECONTE. Guv. An. King., 1831. 



COOPER. Ann. Lye. N. Y., 1837. 



DBKAY. Nat. Hist. N.-Y., 1842. 



WAGNER. Schreb. Saug. 1855. 

 Vespertilio auduboni HARLAN. Month. Am. Journ., 1831. 



