52 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



The trapezium is three times as large as and covers and conceals the 

 trapezoid. It presents a large spheroid surface for first digit, but yields 

 a superficies on same general surface, which is without facet. Proximal 

 surface with dorso-ventral ridge. The trapezoid is sigmoid, slender. 

 The magnum recalls general sliape in man; the distal end is large and 

 oblique. The unciform is irregularly prismoidal, with large lateral sig- 

 moid articular notch. The carpus exhibits a flat, scale like element in 

 first row, which remained with the radius in disarticulation. 



The second and third metacarpal bones are compressed at proximal 

 articular surface, the second being C-shapeand the third spatula-shape. 

 The fourth and fifth are irregularly spinose, the fourth being multifex, 

 articulation axial ; the fifth trifex, articulation lateral. 



In both ArtibcHs and Vampyrus the entire length of the second digit 

 is not greater than the length of the third metacarpal. Hence the 

 movement of digits of third, fourth, and fifth finger do not affect that 

 of the second digit. In Vespertilionidje (well seen in Afalapha) all is 

 different; the second digit of second finger is flexed with the flexion of 

 the entire series. The first metacarpal and the first phalanx of the first 

 digit are as in Macrotns. The fifth metacarpal is the longest and the 

 fourth is the shortest. The second j^halanx of the third digit is greatly 

 longer than in Macrotus; the fifth metacarpal is as long as the forearm. 

 In repose the first digit lies parallel to long axis of the face and above it. 



In common with some other phyllostomine bats {e. g. Stenoderma and 

 Glosso2)haga), some of the elements of the manus are imiierfectly ossi- 

 fied, and hence are flexible. The second digit, the second and third 

 phalanges of the third and fourth digits exhibit this property. 



Remarks on measurements. — The fourth metacarpal bone is shorter 

 than the third and fourth. In the type the three bones are of the 

 same length. The thumb, face, tragus, and foot are as large as in the 

 type, while the forearm, auricle, head, trunk, thigh, and leg are smaller. 

 The phalanges of the manus (excepting those of the thumb) are longer, 

 proportionately to the length of the forearm, than in the type. Hence, 

 the thumb, forearm, bead, auricle, phalanges, thigh, and leg are varia- 

 ble quantities, while the tragus, face, and foot are fixed. 



The females range somewhat larger than the males. In four females 

 the average length of forearm was 70""". In six males it was 66""". 



Habitat. — ]S[eotropical America. 



The reasons for including Artibeus perspiciUatns in this monograph 

 are derived from a statement of Mr. C. F. Maynard (Mammals of Flor- 

 ida, p. 22). This writer reports the existence of the species in Florida. 

 The following extract is taken from Mr. Maynard's paper: 



While at Key West in the early winter of 1870 I observed several large bats flying 

 about the city, which closely resembled in flight a species which I had seen in north- 

 ern Florida two years before, but which flew so high that I was unable to shoot 

 them. I was very anxious to obtain a specimen^ but as shooting was prohibited in 

 the streets of the city of Key West, and as I never saw the bats elsewhere on the 

 island, I feared that I should be obliged to go away without one. I was, there- 



