54 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



margins of the dorsally directed aperture everted, tlie lower outer angle 

 being grooved. The facial clump of glands back of tlie muzzle ele- 

 vated into chib-sliaped masses. Sphenoidal foramen at the bottom of 

 a deep recess. A well-defined hem of membrane between thumb and 

 the second digit. The fifth digit greatly hmger than the forearm. The 

 palmar aspect of digits in undissected specimen with outlines defined 

 at proximal ends. The terminal cartilage of the fourth digit axial, 



small. 



3 3 1'^ 



Denial Formula — Molars^, Premolars -, Canines^, Incisors^, X2= 36 teeth. 



Membranes of the second digital interspace is attached to the ven- 

 tral l)order of the third metacarpal bone; that of the third interspace 

 to its dorsal border.* The thumb is semiflexed, callosity rudimental; 

 phalanges disposed to curve forward in flight. The second phalanx of 

 the third digit is longer than the first. The otic capsnle nuich as in An- 

 trozoiis; the external semicircular canal is free from bone. The tym- 

 panic bone appears to be united to the capsule {as ^jctrosa). 



Corynorhinus differs markedly from Antrozous in the greater devel- 

 opment of the hypocone in both upper and h)wer molars and in the 

 less rudimental form of the third maxillary molar. The points of the 

 cusps are all more produced than in the genus named. 



Since some writers (vide Dobson /. e.) do not accept Cory norh inns as 

 a valid genus but assign thesi)ecies to P/^'co^*/.s the following diagnosis 

 of this genus is given. Plecotus : the first phalanx of the third, fourth, 

 and fifth digits, longer than the second. Nostrils, as in Vcspertilio, i. f ., 

 with a well-defined cornu and a lunate aperture. The internal basal 

 lobe of the ear entire. The tragus foliate scarcely tai^ering above. 

 The sphenoidal foramen not at the bottom of a deep recess. The clumps 

 of gland-masses on the snout not raised, indeed, are smaller than in 

 most genera of the family. 



The following is the manal formula: 



Milli- 

 mt'tfi'. 



Second interspace 2i 



Third interspace 12 



Fourth interspace 20 



Forearm 38 



The material available for study of ('oripiorJiinHs was unsatisfactory. 



I have three exami)les of C. macrotis — one of them immature — two 



alcoholics. Of C. toicnsendii I have four examples in alcohol, all adult. 



both aerial and terrestrial progression; ulna with small proximal rudiment rarely 

 forming a well-defined shaft which is anchylosed to the radius (Kerivoula), hut 

 usually forming a filament whicli ends among the muscles of the forearm; accessory 

 cartilage to the fifth digit i)reseut except in I'lecoU; coracoid as a rule bifid (excep- 

 tions in Flecoli and Anirozous) ', raised folds of skin at the junction of the carpus 

 and metacarpus (except in Plecoli) ; oblique line on the wing membrane at the lower 

 third of the tibia; nose-leaf absent; tail inclosed in the ample iuterfemoral mem- 

 brane, or the last joint alone projecting; hypocone rudimental or absent; the para- 

 couid, metaconid, and hypoconid large, subequal. 

 *Same as in Antrozous, 



