THE FAMILIES AND GENERA OF BATS. 
237 
not specially exaggerated ; m 3 with second triangle not unusually 
reduced, the entoconid small but distinct. Skull with form of 
brain case, and relative length of brain case and rostrum about as 
in Antrozous , but interorbital region not deepened, the forehead 
therefore rising at a distinct though slight angle with upper surface 
of rostrum; posterior portion of palate gradually narrowed (much 
more so than in Antrozous , which in this respect is essentially 
normal), much as in Natalus or Kerivoula. No basisphenoid pits. 
Ears large, extending nearly to or beyond extremity of muzzle when 
laid forward, usually joined across forehead by a conspicuous band of 
membrane, but this obsolete at middle in one species; tragus rather 
short and broad. Muzzle squarely truncate as in Antrozous , but 
with the horseshoe-shaped ridge developed into a low but distinct 
nose leaf; flattened swellings behind leaf more prominent than in 
Antrozous. Second and third metacarpals about equal, the third 
somewhat shorter. 
Species examined —Nyctophilus timoriensis ( Geoff roy ), N. microtis 
Thomas, and N. walkeri Thomas. 
Subfamily TOMOPEATIN^]. 
Geographic distribution. — Peru. 
Characters. — Seventh cervical vertebra fused with first dorsal; ear 
with no anterior basal lobe, but with a distinct rudimentary keel; 
audital bullse disk-shaped, owing to the great emargination of inner 
border. Otherwise as in the Vesper tilioninse. 
Remarks. — This subfamily combines in a very remarkable manner 
the characters of the Vespertilionidse and Molossidse. The general 
external appearance, the thin membranes, broad wings, slender leg 
and foot, and the long tail wholly included in the uropatagium are 
strictly Vespertilionine. The same is true of the skeleton as a wdiole. 
The fibula, though perhaps larger than in most Vespertilionidse, is 
scarcely better developed than that of Tylonycteris , while its form 
shows no departure from the general rule in the family. On the other 
hand, the seventh cervical vertebra is fused with the first dorsal, a 
character that I have not seen in any other genus of Vespertilionidse, 
but which is apparently universal in the Molossidse. The ear, both 
externally and in the peculiar emarginate- flattened form of the 
tympanic bone, is essentially Molossine in structure, though the conch 
shows no tendency to assume the leathery texture usually character- 
istic of this group. The upper lip, though more widely expanded 
than in any Vespertilionine bat that I have examined, is not heavily 
wrinkled, and the nostrils have no trace of the horny processes so 
characteristic of the Molossidse. Neither are there any of the modi- 
fied, spoon-shaped hairs on muzzle or chin. 
Principal subdivision. — The subfamily is represented by the genus 
Tomopeas only. 
