478 Bibliographical Notices. 



Posterior edges of wing-membrane bordered with white ; bifid 

 tip to fourth finger unusually distinct * ; wings from the base 

 of the fifth toe ; post-calcareal lobe small and narrow ; tip of 

 calcar ])rojecting slightly from the back of the membrane ; 

 tail included in membrane to the extreme tip. 



Teeth. — Upper incisors one on each side, long, slender, 

 unicuspid ; upper premolars large, quite close to the canines ; 

 no trace of a minute anterior premolar. Lower incisors six, 

 the four median ones broad, tricuspid ; the outer ones uni- 

 cuspid, exceedingly minute, practically invisible from in 

 front, and scarcely one twentieth of the size in cross section 

 of the median incisors ; far smaller therefore both absolutely 

 and relatively than in Rh. parvula. 



Dimensions of the type (an adult female in spirit) : — 



Head and body 47 millim. ; tail 41 ; ear, above head 12'2, 

 from notch 16; tragus, inner margin 7; forearm 35; 

 thumb 5 ; metacarpal of third finger 33*5 ; lower leg 15*5 ; 

 hind foot 7*1 ; calcar 15. 



Skull of a second specimen : occiput to gnathion 14*7 ; 

 greatest breadth 9*5 ; distance from front of canine to back of 



Hah. Santa Rosalia, near Autlan, Jalisco, Mexico. 



This interesting species shows a relationship to Nycticejus 

 humeralis f and to Old-World Nycticeji by its dental formula 

 and the unicuspidate character of its upper incisors ; to Rho' 

 geessa by its obliquely truncated muzzle and its cylindrical ,73 ; 

 and finally to Antrozous by its crenulate tragus and by the 

 extreme reduction of the same o? which is altogether absent 

 in that genus. 



BIBLIOGRAPHICAL NOTICES. 



Fur-hearing Animals in Nature and in Commerce. By Henrt 

 Poland. Guruey and Jackson. 



Wio are told in the preface that this " work is intended, firstly, to 

 aid persons engaged in trade to recognize readily and to have a 

 closer knowledge of the animals with which they are to some extent 

 already familiar, and which they would have some difficult)- in 

 finding in more elaborate and scientific works ; " and in this respect 



* This peculiar bifid tip to tlie fourth digit does not seem to liave been 

 often noticed, as I can find no reference to it, although it occurs more or 

 less developed in Rhogeessa, Antrozous, Ni/cticejus, Atalapha, and cer- 

 tainly in some of the many species of Vesperuffo. 



+ For nomenclature see Ann. Mus. Genov. (2) ix, p. 88, 1890 j and 

 Ann. & Mag. Nat. Hist. (0) vii. p. 528 (footnote), 1891. 



