MAMMALIA — CHIROPTERA. 
27 
which alone the genera and snh-genera can be established; and he adheres 
to those which serve merely for defining the species. I will therefore 
abridge my account of them. Under Scotophilus, Gray will only admit 
the species whose flying membrane is fixed from the heel to the root of 
the toes (V. serotinus^ discolor, Leisleri, murinus). Noctulinia is a 
new genus like Scotophilus, but the flying membrane is only fixed to 
the heel ( V. proterus and fulvus ). Vespertilio comprises the species 
which have the feet free, with the wings only attached to the ankles ; and 
the interfemoral membrane is furnished only with a few scattered hairs, 
and the face is short and hairy (V. mystacinus, Daubentonii, Caroli). 
From these Gray separates five new genera: — 1. Trilatitus ( ! ) feet free; 
interfemoral membrane with cross tufts of hair beneath ( V. Hasseltii, 
macdlus, hlepotis). 2. Kerivoula, the same; but the wing arises from 
the root of the toes ( V. Hardwickii, pictus, tenuis ) ; and two new spe- 
cies, K. griseus! habitat unknown; and K. poensis, from Fernando Po. 
3. My Otis ; wing extending to root of toes ; ear large ; tragus long ( V. 
murinus, already cited by the author at Scotophilus !i V. Bechsteinii 
and Natereri). From Vespert. suillus, the genus (4.) Murina is made; 
and from F. harpyia, the genus (5.) Harpiocephalus. 
On the genus Centurio of Gray, with ^ incisors ; large ears ; short 
indented tragus ; no tail ; deeply cut in flying membrane ; I will refer 
for further information to S. Muller and Schlegel, as the Centurio senex 
of Gray from Amboyna, occurs in their Fauna of the Indian Archi- 
pelago. 
Bachmann in the Journ. of the Acad, of Nat. Science of 
Philadelphia, viii. 2 (1842), p. 280, has described four species 
of Vespertilio, collected from North America. 
As the author was unacquainted with the work of Keyserling and 
Blasius, he has overlooked the value of some important characters, as for 
example, those derived from the grinders, whose number he does not 
give, whilst he notes all the incisors and canine teeth, although these 
are universally present in the same number as a constant generic mark, 
and thus possess no value for specific definition. 1. Vespertilio monti- 
cola ; “ Vesp. subulata brevior, auriculis brevioribus, tragis non exce- 
dentibus dimidium longitudinem auriculas ; colore fulvo ;” body 1" 8'" ; 
tad 1^" : from Virginia ; 2. F. virginianus ; “V. monticola paululum 
longior, auriculis paululum longioribus, magisque acutis ; dentibus prim- 
max. sup- simplicibus; interfem. membrana nuda; corpore supra fuligineo- 
fusco, subtus cinereo-fuscato from Virginia: 3. F. Leibii; “ V. supra 
fusco-ferrugineus, subtus cinereus, alis auribusque nigris ;” body 1" 7 '" ; 
tail 1" 4z "' : from Michigan : 4. F. calif ornicus ; “ V. fusco-lutescens, 
vellere longo et molli, trago longitudine dimidium ;” body 1" 7'" ; tail 
71 
