1904] NATURAL SCIENCES OF PHILADELPHIA. 205 



Chilonycteris psilotis Dobson. 



1878. Chilonycteris psilotis Dobson, Catal. Chiropt. Brit. Mus., p. 451 PL 

 XXIII, fig. 2. 



1902. Chilonycteris psilotis Miller, Proc. Biol. Soc. Wash., XV, p. 249. De- 

 cember 16, 1902. [Isthmus of Tehuantepec, Mexico.] 



Type Locality and Distribution. — Dobson's types (cJ' and ?) came 

 from an unkno-^Ti locality, and until the recent record of the species 

 by Miller (vide supra) nothing was known regarding its habitat. The 

 Isthmus of Tehuantepec is according^ the only locality from which 

 the species is known. 



General Characters. — Size medium; ear without distinct notch on 

 the external margin ; toes distinctly longer than the remainder of the 

 foot. 



Head. — Rather short and broad; rostrum moderately depressed, 

 bearing on its superior aspect a distance back of the nosa a trans- 

 verse, arcuate fleshy ridge, equal in width to the nose-pad itself. 

 Ears moderately elongate, rather broad (for the genus), apically sub- 

 lanceolate, the lower margins extended considerably forward, but 

 failing to reach the angle of the mouth; internal margin of the ear 

 attached to the head superior to the eye, internal ridge distinct, thick- 

 ened, slightly arcuate, evenly rounded inferiorly and passing by a 

 well-marked shoulder into the internal margin of the ear, distal two- 

 thirds of the internal margin arcuate, slightly sinuate toward the apex 

 and furnished about half-way between the apex and the shoulder of 

 the internal ridge with a series of four small tooth-like projections ; 

 external margin basally convex, apically concave, without any distinct 

 notch; apex rather slender, subfalciform, narrowly rounded. Tragus 

 oblong, apex rather acute, accessory flap small and rounded. Nos- 

 trils transversely ovate, superior margin with a rather low ridge which 

 is divided into about six parts by shallow incisions, lateral margins 

 flanked by low rounded fleshy folds. Labial chin-lappet strongly 

 transverse, bearing a raised margin lateralh%" inferior margin verj^ 

 broadly and slightly concave, median portion of the lappet with 

 rather obscure papillae; superior margin with a deep median emar- 

 gination, which lodges the simple lip-pad. Posterior chin-lappet 

 slight, a simple fold equal in width to the labial fold, against which it is 

 closely set. 



Limbs. — Forearm moderately long, considerably bowed in the proxi- 

 mal half. Femora and tibise moderately robust (for the genus) ; foot 

 elongate, somewhat compressed, considerably more than half the length 

 of the foot occupied by the toes ; calcanea but slightly longer than th*^- 

 tibise and provided with a free apex. 



