PLECOTUS 



193 



at its extremity, in front of deep grooves separating the hairy, 

 flat, and depressed central region from the glandular sides. 

 There is no groove in front of the nostrils. 



The wing (Plate XVII., Fig. i) is broad and arises from the 

 base of the toes. The antibrachial membrane is well developed. 

 The fifth metacarpal is a little shorter 

 than the third and fourth. 



The calcar extends about half-way 

 from foot to tail. There is no post- 

 calcarial lobe. The tail is almost as 

 long as the head and body, and has 

 the tip slightly exserted. 



The skull (Fig. 8, No. 4, p. loi) 

 is weak ; the profile descends gradu- 

 ally from the inflated brain - case to 

 the depressed, broad, not saddle - 

 shaped facial region ; the zygomata 

 are flattened ; the cranial crests are 

 very slightly developed ; the auditory 

 bullae are very large, fully equalling, or, 

 perhaps, exceeding, in size those of 

 much larger bats, such as Nyctalus 

 noctula, Vespertilio serotinus or Myotis 

 myosotis. 



There are two less teeth (Fig. 8, 

 No. 4, p. loi ; Fig. 19 ; and Fig. 20, 

 p. 197) than in Myotis, one pair of upper premolars being absent ; 

 two more than in Barbastella, the formula being : — 



Fig. 19. — Diagram of Arrange- 

 ment OF Teeth in Genus 

 Plecotus. 



(l) Upper and (2) Lower Jaw. 



2-2 



I - I 



pm 



3-3' 



3-3 

 3-3 



36. 



The upper incisors point directly inwards ; the inner Is 

 bifid, with inner cusps much exceeding the outer ; the outer is 

 smaller and unicuspid. The canine is without accessory cusps. 

 The anterior upper premolar, although small, is distinctly visible 

 externally. The posterior upper premolar is large. The three 

 lower premolars graduate in size from the posterior to the 

 central, which is smallest. 



