ALLEN: BATS OF THE GENUS CORYNORHINUS. 353 



Measurements. — The type measures: forearm 44 mm.; digit III, 

 metacarpal 42.4; first phalanx 14; second phalanx 16.3; digit IV, 

 metacarpal 41.6; first phalanx 11.5; second phalanx 13.5; digit V, 

 metacarpal 42; first phalanx 11; second phalanx 7; tibia 17; hind 

 foot 10; ears (dry) from meatus 31 ; greatest breadth 21. 



Skull: greatest length 17.5 mm.; basal length 14.9; palatal length 

 8.5; zygomatic breadth 10; interorbital constriction 4.8; mastoid 

 breadth 10; width of braincase 9.6; upper tooth-row 7; lower tooth- 

 row 7.1. 



Remarks. — Though the type specimen was recorded thirty-five 

 years ago, as Plecotus auritus, this remarkable species has remained 

 till now unknown. The peculiar olive tone to the fur of the back is 

 very different from the buffy or brown of the other known species. 

 The very large and stiff ears are much like those of Antrozous, except 

 for the breaking up of the transverse ribs at the middle of the outer 

 margin. In this latter respect the ears recall those of Plecotus, in 

 which also, the ribs run quite to the margin of the ear, instead of to a 

 line parallel with the rim, as in other species of Corynorhinus. In 

 Plecotus, however, the number of these ribs is about double that in 

 C. phyllotis. The latter further resembles Plecotus in the possession 

 of distinct lachrymal ridges on the skull, so that this character can no 

 longer be considered of generic value in distinguishing between the two. 

 A long narrow keel on the calcaneum is likewise diagnostic of this new 

 bat, for in Plecotus as in other forms of Corynorhinus the calcaneum 

 is without keel. In the squarish outline of the nostrils and the devel- 

 opment of the excrescences on the muzzle it is typical of its genus. 

 The peculiar bulging of the anterior part of the braincase iS not seen 

 in other members of this group. The tibia is proportionally shorter 

 than in the smaller C. megalotis mexicanus which inhabits the same 

 region. 



Specimen examined. — The type. 



