llOl'SKlTfS. 



Diagnosis. — Geueral shape of skull as in Eidolon, but no bony 

 auditory meatus, premaxillaries in contact or co-ossitied in i'ront. 

 Incisors f — H ; cheek-teeth j or ^ ; lower incisors (when unworn ) 



2 J ' b b ' ^ ' 



bifid ; p' subequal in bulk to an upper incisor ; ra^ shorter than m, 

 and m^ combined. Second digit clawed ; membranes from sides of 

 back ; a short tail. Forearm 69"5-99 mm. 



Skull (figs. 2-4 *). — Brain-case in most species deflected very 

 nearly to the same degree as in Eidolon, the alveolar line projected 

 backward passing through upper part of occipital condyle or upper 



Fig.-. — RousiUus wifirpiiaius, rj. . C;uro, Egypt. r!Cu. 3. 12.S. 1. j. 



margin of foramen magnum ; in one species ( 7i'. lanosus: subgonu-s 

 Stenonycteris') the deflection is so strong that the prolongation of the 

 alveolar line goes through the middle of the supraoccipital, in another 

 {R. anfjolensis : subgenus Lissomjcleiis) so slight that the liiie 

 passes below, or througli the lower margin of, the occipital condyle ; 

 in all species the deflection is distinctly greater in immatuv© and 

 young than in fully adult individuals. Tympanic never elongated 

 e.xternally into a bony auditory meatus. Ilostrum comparatively 



Fig. y oil p. 49, fij.'. 4 tiu p. b'l. 



