rare Amazonian Mammals. 135 



Posterior lower premolar * contracted antero-posteriorly, the 

 two premolars crushed between the canine and first molar. 

 Type :— 



Cyttarops alecto, sp. n. 



General appearance that of a medium-sized Saccopteryx or 

 Peropiery.r. 



Fur rather long, thin and loose; hairs of back about 6 mm. 

 in length. Colour above and below uniform dull smoky grey, 

 a little browner than Kidgway's "mouse-grey"; the bases 

 of the hairs inconspicuou.sly paler than the tips on the fore- 

 back, darker on tlie hind-back. Membranes naked, except 

 that the median proxinnil portion of the intcrfemorul is more 

 or less hiii'.y. Kars of medium length, broadly rounded, a 

 hair-covered ridge ruiuiing up the thin anterior surface to the 

 tip, cutting off their anterior third ; front edge strongly 

 convex, tip rounded, outer margin convex. Tragus very 

 remarkable in shape, its inner edge of medium length, 

 straight, inner terminal corner angular, outer rounded; lower 

 half of outer margin occupied by a proportionally enormous 

 angular lobe, no i«uch lobe being known in any other bat, the 

 most similar being that on the inner side of the tragus in 

 Meyiiderma. Wings to the outer side of the tarsus. Calcar 

 long, without postcalcareal lobule. 



•Skull and teeth as defined above. 



Dimensions of the type (the starred measurements taken in 

 the tlesli by the collector) : — 



Forearm 46 mm. 



Head and budy *50 ; tail *20 ; hind foot *8 ; ear 10; 

 tragu> on inner edge 2*8 ; third finger, metacarpal 4'5, first 

 phalanx 9*5 ; lower leg and foot (c. u.) 27 ; calcar 15. 



tSkull : greatest length 12'6; basi-sinual length 10*1; 

 zygomatic breadth 6; interorbital breadth 4*5; length of 

 postorbital process 2'5 ; interten)poral breadth 3'7 ; breadth 

 of brain-case 7 ; height of brain-case from between bull® 5'6; 

 palato-sinual length 3*1 ; breadth between outer corners of 

 III' 6 ; front of canine to back of m^ 5'5. 



lluh. of type as above. Another specimen from British 

 Guiana. 



Tiiis bat forms a most remarkable and interesting discovery, 

 owing to its relationship to the aberrant Diclidurus, which it 

 tends to connect with the ordinary members of the Emballo- 

 nuridtB. Iti appearance it is just like an average sac-wing 



* This tooth 13 peculiarly abnormal on both sides in the type, the 

 above description being based on Mr. McConneH's specimen. 



