23. ARTIBEUS. 517 



two external, narrow, sharp-edged cusps, the flat or slightly concave 

 inner side of the tooth forms quite four fifths of its crown, and 

 has two very small cusps on its antero-internal margin, which 

 become worn down with age ; second molar two thirds the ante- 

 penultimate molar, wdth a single narrow and long external cusp, 

 one posterior and one internal and anterior basal cusp, between 

 these cusps the crown of the tooth is concave ; third molar very 

 small, scarcely larger than one of the lower incisors, placed in a 

 concavity in the posterior side of the second molar, and very easily 

 overlooked on examination; lower incisors very small, equal, not 

 grooved ; canine with a small posterior basal cusp ; first lower pre- 

 molar obliquely lozenge-shaped ; second premolar with a posterior 

 obtuse basal cusp ; molars with broad flat crowns, from the antero- 

 external and antero-internal margins of which short cusps arise, the 

 second molar about three fourths the first, the last molar very 

 small, circular, about the size of the last upper molar (Plate XXVIII. 

 fig. 1). 



Length (of an adult $ ), head and body 3"-2, interfemoral 

 membrane in the middle 0"-7, head l"-2, ear 0"-55, tragus 0"-28, 

 nose-leaf 0"-5x0"-3, forearm 2"-6, thumb 0"-6 ; third finger— 

 metacarp. 2"-3, 1st ph. 0"-8, 2nd ph. l"-2, 3rd ph. 0"-9 ; fourth 

 finger— metacarp. 2" -25, 1st ph. 0"-7, 2nd ph. 0"-9 ; fifth finger— 

 metacarp. 2"-3, 1st ph. 0"-5, 2nd ph. 0"-7; tibia 0"-95, foot 0"-65. 



Hah. Guiana, Brazil (Pernambuco). 



I have identified this species with that described by Spix under 

 the name of Phyllostoma planirostre, as the characters agree in all 

 respects. The absence of the last minute upper premolar in the 

 type may be due either to the immaturity or to the advanced age of 

 the specimen. Of three specimens from Pernambuco in the Collec- 

 tion, one (immature) has the last upper molar extremely small, so 

 small as to be discovered with considerable difiiculty; the second 

 and third (immature and adult respectively) have no trace of this 

 tooth. 



This species appears to be very abundant in British Guiana. I 

 found colonies of it inhabiting the roofs of every house in which 

 Bats were discovered. It is especially common in the roofs of the 

 sugar-factories, the heat of which probably attracts it. 



