1904.] NATURAL SCIENCES OF PHILADELPHIA. 253 



distinctly papillose, the papillae bordering the arched incision separating 

 the smooth incisive pad larger than the others; posterior chin-lappet 

 almost equal to the labial in width, thin, closely ad pressed. 



Limbs. — Forearm of medium length, very distinctly arcuate though 

 the distal portion is considerably straighter than the proximal; third 

 finger slightly more than one and one-half times the length of the fore- 

 arm. Femora, tibiae and feet rather slender; calcanea about a fourth 

 as long again as the tibiae. 



Membranes and Fur. — Membranes rather thin, but very tough and 

 leathery; propatagium deep, extending free to the thumb; endopata- 

 gium and mesopatagium with the longitudinal nerves very regularly 

 and completely distributed, endopatagium attached along the median 

 line of the body by a thin membrane, otherwise free except that ante- 

 riorly it is squarely attached across the shoulders and posteriorly it 

 is tightly attached from the middle of the femur to its margin shghtly 

 below the middle of the tibia; uropatagium large, the calcanea bound 

 down to the tibiae to a point opposite the attachment of the endopata- 

 gium, tail with the enclosed portion slightly exceeding the free apical 

 section. Fur woolly, evenly distributed over the visible and concealed 

 sections of the dorsal surface and also the entire venter; membranes 

 almost entirely covered with extremely fine short hair; muzzle and 

 lips with groups of distinctly setiform hairs. 



Color.^ — General color vandyke-browai, membranes and ears with a 

 shght touch of blackish. It is quite probable that typical davyi will 

 be found to possess a rufous form, as two phases of coloration have been 

 found in almost all the other species and races of the Mormoopinae. 

 The distinct color phases of D. davyi fidvus are very marked, but pos- 

 sibly the more southern type possesses but one color form, or one 

 strongly predominating phase, a case of which is probably found in 

 Chilonycteris rubiginoso. and rubiginosa mexicana. 



Skull. — Rather fragile ; rostrum considerably inflated and somewhat 

 depressed. Brain-case evenh' arched transversely and with a shght 

 longitudinal depression, dipping suddenly toward the rostrum; zygo- 

 mata widest posteriorly and without any distinct arcuation. Rostrum 

 very distinctly inflated, the greatest width over the posterior molars; 

 nasal depression broad, smoothly excavated. Mandible rather long, 

 the ascending ramus very low and weak ; coronoid and condylar pro- 

 cesses low, inconspicuous and equal in development; angle strongly 

 curved laterally and with a recurved tip. 



^ From alcoholic specimens. 



