1. EIDOLON, liojin. 



Ci/non)/cicris (pt.), Dobson, Cat. Chir. B. M. p. 70. 



Type. 

 1815. Eidolon, Rafinesque, Anah/se de la Nature, p. 54 . . E. lielvum. 

 1861. Pterocyon, Peters, MB. Akad. Berlin, p. 423 E. helvum. 



1881. Leipouyx, Jentink, Notes Leyden Mies. iii. p. 60 (Jan. 



1881) \_nec Liponyx, Vieillot,18\Q, a genus of birds]. E. helvum. 



1882. Liponyx, Forbes, Zool. Record, xviii. (lor 1881), 



Mamin. p. 13 (nom. emend.). 



Diaf/nosis.- — Basicranial axis di.stinctlv deflected ; occiput not 

 elongated and tubular ; a short bony auditory meatus ; palate 

 much broader posteriorly than between canines ; length of rostrum 

 much greater than lachrymal width ; front of orbit vertically 

 above middle or posterior halt of m' ; premaxillaries separated in 

 front. Incisors^ — ^; cheek-teeth ^ ; p' in cross section much 

 larger than an upper incisor ; m^ equal in length to m, and m^ 

 combined. Second digit clawed ; membranes from sides of back ; 

 a short tail. Forearm 114-132 mm. 



Skull (fig. 1).— Brain-case moderately deflected : alveolar line pro- 

 jected backward passing very nearly through bases of posttympanic 

 and paroccipital processes and upper margin of occipital condyle. 

 Occiput not (as in Pierojms) produced backward and downward 

 into a conspicuous tube. Tympanic elongated externally into a 

 short tubular bony auditory meatus (a peculiarity unique among 

 Bats). Palate broadest between m'^-m^, breadth at palation border 

 much greater than between canines, and about equal to breadth 

 between inner sides of p* (cf. Pteropvs). Rostrum long : length 

 from front of orbit to tip of nasals much greater than lachrymal 

 ■width of skull, subequal to (a little longer or shorter than) length 

 of maxillary tooth-row ; front margin of orbit vertically above 

 middle or posterior half of m^ (cf. Myonycteris). Tip of nasals 

 nearly vertically above front of premaxillaries (cf. Pteropiis). 

 Premaxillaries slightly, but distincti) and constantly, separated in 

 front (cf. Boiisfttus, Myonycteris, Pteropus). Width of frontals at 

 interorbital constriction slightly less than (or at most equal to) 

 width at postorbital constriction. Postorbital processes in aged 

 specimens reaching about halfway between frontal and zygoma. 

 Sagittal crest short and low, the temporal ridges sometimes 

 remaining .separate throughout the life of the individual ; larabdoid 

 crest strong, projecting backward considerably beyond the plane of 

 the supraoccipital. Posttympanic processes longer than paroccipital 

 processes. Ectopterygoid processes small. 



i* i" c p^ p'' p* m^ m' 



Dentition (fig. 1). — r-. ^-^--^ X 2 = 34. p' and m% p, 



i,i^cp,p3p,m^m^_m3 ^ 'i' 



and m^ reduced. One skull of E. helvum in the collection (ad., teeth 



slightly worn ; no history ; specimen c' in the list — infrc'c p. 15) 



has a minute m"' on one side. 



