THE FAMILIES AND GENERA OF BATS. 205 



Teeth strictly normal and not differing in any essential features 

 from those of Myotis and Lasionyvteris, except in the absence of both 

 pm 3 and pm „. Outer upper incisor not as large as inner, but extend- 

 ing considerably beyond its cingulum. Inner upper incisor simple, or 

 more often with a well-developed secondary cusp." Canines usually 

 rather stout, the posterior cutting edge of upper tooth often, though 

 not invariably, with incipient secondary cusp. Anterior upper pre- 

 molar barely or not in toothrow. Other teeth with no special peculi- 

 arities. Skull (fig. 32) essentially as in Myotis, though with a tend- 

 ency to greater breadth. External charac- 

 ters not essentially different from those of 

 Myotis, but ear usually shorter and broader, 

 and tragus less acutely pointed ; in some spe- 

 cies bent forward at tip. 



Species examined.— About half the known 

 species have been examined. 



Remarks. — As stated by Flower and 

 Lydekker, the coracoid in Pipistrellus is bi- 

 fid at tip, though very slightly. It differs 

 further from that of Myotis in its much 

 slighter curvature. The members of the 

 genus are recognizable by their dental for- FlG - 32.-pipistrellus pipistrel- 

 mula, large outer upper incisor, unmodified 



skull and ears, and the normally long fifth finger. The species are all 

 small, some of them the smallest of known bats. 



Genus GLISCHROPUS Dobson. 



1875. Glischropus Dobson, I'roc. Zool. Soc. London, p. 472 (nanus and tylo- 



pus). Subgenus of Vesperugo. 

 1878. Vesperugo Dobson, Catal. Chiropt. Brit. Mus., p. 183 (part). 



Type-species. — Vesperugo tylopus Dobson. 



Geographic distribution. — Borneo and Batchian. 



Number of forms. — This genus, as here understood, contains the 

 species tylopus Dobson and bate hianus Matschie and href til Peters; 

 nanus, although referred to it by Dobson, proves to have the teeth 

 of true Pipistrellus. 



Characters. — Externally like Pipistrellus, but with the callosities 

 on sole of foot and ball of thumb usually more developed. Teeth 

 as in Pipistrellus except that outer upper incisor is forced outward 

 from the toothrow and so turned that its convexity is directed out- 

 ward instead of backward. 



Species examined. — Glischropus tylopus ( Dobson "> and G. kreftii 

 (Peters). 



« This cusp is present in Pipistrellus abramus, P. eeylonicus, P. chrysothri.r, 

 P. imbricatus, P. Icuhlii, P. mimus, P. murrayi, P. papuanus, P. pipistrellus, and 

 P. raptor. It is absent in P. ariel, P. erassulus, P. deserti, P. hesperus, P. nanus, 

 P. nanulus, P. ridleyi, and P. subflavus. 



