160 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
Genus ARTIBEUS Leach. 
1821. Artibeus Leach, Trans. Linn. Soc. London, XIII, p. 75 {jamaicensis ) . 
1821. Madatceus Leach, Trans. Linn. Soc. London, XIII, p. 81 ( lewisii= 
jamaicensis ) . 
1827. Medateus Gray, Griffith’s Cuvier, Animal Kingdom, V, p. 74. 
1838. Arctibeus Gray, Mag. Zool. and Bot., II, p. 487. 
1843. Medateus Gray, List spec, mamin. Brit. Mus., p. xviii. 
1847. Arctibius Bonaparte, Proc. Zool. Soc. London, p. 115. 
1855. Pteroderma Gervais, Exped. du Comte de Castelnau, Zool., Mammif., 
p. 34 (“; perspicillatum ” from Peru, Brazil, and Guiana). 
1855. Artibceus Gervais, Exped. du Castelnau, Zool., Mammif., p. 34. 
1855. Dermanura Gervais, Exped. du Comte de Castelnau, Zool., Mammif. 
p. 36 (cinereum) . 
1878. Artibeus Dobson, Catal. Chiropt. Brit. Mus., p. 514. 
1878. Uroderma Dobson, Catal. Chiropt. Brit. Mus., p. 515 (subgenus, part). 
1878. Dermanura Dobson, Catal. Chiropt. Brit. Mus., p. 515 (subgenus). 
1889. Dermanura Cope, Amer. Nat., XXIII, p. 130, February, 1889 (genus). 
1892. Artobius Winge, Jordfundne og Nulevende Flagermus (Chiroptera) 
fra Lagoa Santa, Minas Geraes, Brasilien, p, 10. 
Type-species. — Artibeus jamaicensis Leach. 
Geographic distribution. — Warmer parts of America, north to 
Cuba, southern Florida, and central Mexico. 
Number of forms. — About 15 forms of Artibeus are now known. 
Characters. — Dental formula (Plate V) : 
-2 3.1. — 34 5 6 (7) .2-2 1-1 2-2 2-2 2-2 3-3 
1 2 -. 1. - 2 - 4 5 6 (7) * 2 - 2’ c 1 - V # 171 2 - 2’ m 2-2’ 3 - 3’ 0r 3 - 3“ 
28, 30, or 32. 
Upper incisors small, closely crowded, completely filling space be- 
tween canines, the inner with a distinctly bilobed cutting edge, the 
outer simple, hardly extending beyond base of crown of inner, but 
about equal to it in length, the cutting edge entire, oblique. Lower 
incisors smaller than upper, closely crowded between canines, the 
crowns broader than long, with slightly bilobed cutting edge. Ca- 
nines stout, simple, with distinct cingulum but no secondary cusps. 
Upper premolars with large triangular outer cusp and broad flattish 
or concave inner surface directed backward and slightly inward; 
style's slightly developed, but the posterior usually forming a notice- 
able cusp ; second premolar with distinct though sometimes low inner 
basal cusp. Lower premolars not unlike the upper but broader rela- 
tively to their length and without the evident concave inner surface; 
the second often closely resembling the canine, especially in the 
smaller species. First upper molar with crown noticeably broader 
than long, much longer externally than internally, most of its sur- 
face occupied by a shallow-concave crushing area, the enamel of 
which is noticeably wrinkled; protocone and hypocone well devel- 
