NO. 1514. REVIEW OF THE BAT GENUS HEMIDERMA—HAHN. 



115 



Menibranea. — The meml)ranes are thinner and more brownish than 

 perspiciUatuni ; wing membranes usually from distal end of tibia 

 slightly alwve the level of the calcar, the position of attachment vary- 

 ing somewhat, Calcar weak. 



Ears and tragus. — P^ars narrow and pointed, the edges compara- 

 tivel}' straight. Tragus variable, essentially as \\\ perspicillatum. 



Nose-leaf. — Nose-leaf narrow and thin, tapering gradually to the tip. 



Skull and teeth. — Skull small, with a high, strongly rounded brain, 

 case and short, broad rostrum; palate wide posteriori}', narrowed 

 anteriorly. Teeth small, the canines and premolai's lieing especiall}' 

 reduced; longitudinal axis of the second premolar not in a plane 

 parallel to that of the first premolar and canine, but with the anterior 

 edge turned in so that there is a distinct angle in the line of the tooth 

 row at that point; second premolar with a distinct posterior process 

 or heel; internal cusp of first molar relatively large. Mandibles and 

 mandibular teeth small and weak; the lower edge of the mandibles 

 without a distinct downward curve at the symphysis; coronoid process 

 onl}' slightl}" anterior to condylar process. 



Specimens examined. — Total number 55, from the following localities, 

 all in Mexico: 



Colima: Hidalgo Magdalena, 7. 



Oaxaca: Santa Ifigenia, 20. 



Vera Cruz: Otatitlan, 1; Minatitlan, 1; Coatzacoalcos, 1 ; Mirador, 2. 



Campeche: Apazote, near Yohaltun, 21. 



Yucatan: Merida, 1. 



Honduras: Patuca River, 1. 



Bemarhs. — Hemlderma suhrufum is in a way intermediate between 

 H. perspiciUatuni and its subspecies, aztetmm on the one hand and 

 II. castaneum on the other, though apparently not intergrading with 

 either. From the former it differs in its smaller size and lighter den- 

 tition and smaller and differently shaped skull; castaneum ^ on the 

 other hand, is nuich smaller and has the cranial and dental peculiarities 

 of suhrufum carried to the extreme. 



Table of average skin measurements, in 'millimeters, of Hemiderma suhrufum. 



a Measurements from dried skins. 



