NO. 5 MAMMALS OF PANAMA GOLDMAN 203 



CHIRODERMA ISTHMICUM Miller 

 Isthmian Bat 

 [Plate Z7, figs. 2, 2a] 

 Chiroderma isthmicum Miller, Proc. U. S. Nat. Mus., Vol. 42, No. 1882, 

 p. 25, March 6, 1912. Type from Cabima, Panama. 



The Isthmian chiroderma is a rather small, brownish bat with the 

 outer side of the forearm and the upper side of the interfemoral 

 membrane well clothed with fur. A white dorsal stripe which is con- 

 spicuous in Chiroderma salvini seems to be indistinct or obsolete in 

 this species. The forearm measures about 45 millimeters. 



Chiroderma isthmicum was based on two specimens obtained by 

 August Busck at Cabima. An individual flew into my room at 

 Cana during the evening of May 21, 19 12, and alighted on the wall 

 where it was captured and one presented by Mr. George A. Brown 

 was secured by him at Culebra. 



Specimens examined: Cabima, 2 (including type); Cana, i; 

 Culebra, i. 



CHIRODERMA SALVINI Dobson 

 Salvin's Bat 



Chiroderma salvini Dobson, Catal. Chiropt, Brit. Mus., p. 532, 1878, pi. 29, 

 fig. 3. Type from Costa Rica. 



Salvin's bat is a handsome species, dark brown above, the face 

 marked with white stripes, a pair of which extend from the outer 

 edges of the nose leaf upward diverging gradually to near the inner 

 sides of the ears. Another pair of short stripes reach backward, 

 one on each side, from the angles of the mouth. A distinct white 

 median dorsal stripe is also present. The forearm measures about 

 53 millimeters. Contrasted with C. isthmicum this bat is recogniz- 

 able by larger size, and apparently by the conspicuous white facial 

 and dorsal markings. The latter character may be unreliable, how- 

 ever, as it is known to be variable in some species of bats belonging to 

 this general group. 



A single individual was knocked down as it flew through a lighted 

 corridor at the Darien gold mines at Cana, May 7, 1912. No others 

 appear to have been taken in Panama, but the species was recorded 

 from Colombia by Alston (1879, p. 207). 



Specimens examined: Cana, i. 



Genus ARTIBEUS Leach 

 The genus Artiheus includes species varying in size from rather 

 large to small, some of which range far north in Middle America. 

 A pair of white facial stripes arising from the sides of the nose 



