THE FAMILIES AND GENERA OF BATS. 
221 
Old World genera are the more highly modified; but in cranial and 
dental characters the American forms depart more widely from the 
ordinary Vespertilionine type. 
Genus GLAUCONYCTERIS Dobson. 
1875. Glauconycteris Dobson, Proc. Zool. Soc. London, p. 383 (subgenus 
of Ghalinololms ) . 
1878. Glauconycteris Dobson, Catal. Chiropt. Brit. Mus., p. 247 (subgenus 
of Chalinolobus ) . 
1901. Glauconycteris de Winton, Ann. and Mag. Nat. Hist., 7th ser., VII, 
p. 46, January, 1901. Genus (part; included Rhinopterus floweri). 
Type-species. — Kerivoula poensis Gray. 
Geographic distribution. — Africa, south of the Sahara. 
Number of forms. — Five species of Glauconycteris are now recog- 
nized: G. argentatus (Dobson), G. beatrix Thomas, G. papilio 
Thomas, G. poensis (Gray), and G. variegatus (Tomes). 
Characters. — Very similar to Chalinolobus , but graduation of meta- 
carpals more noticeable (one-fifth to one-sixth forearm), outer in- 
cisor crowded between canine and inner incisor, and small upper 
premolar ( pm 2 ) absent. The third upper molar is relatively larger 
than in Chalinolobus , though of the same shape. 
Species examined. — Glauconycteris argentatus (Dobson), G. beat- 
rix Thomas, G. papilio Thomas, and G. poensis (Gray). 
Genus LASIURUS Gray. 
1831. Lasiurus Gray, Zoological Miscellany, No. 1, p. 38. 
1870. Atalaplia Peters, Monatsber. k. preuss. Akad. Wissensch., Berlin, p. 
907. Not Atalaplia Raflnesque, 1814. 
1878. Atalaplia Dobson, Catal. Chiropt. Brit. Mus., p. 267 (part). 
1894. Atalaplia H. Allen, Monogr. Bats N. Amer. (1893), p. 141, March 14, 
1894. 
1897. Lasiurus Miller, North American Fauna, No. 13, p. 105, October 16, 
1897. 
Type-species. — V espertilio borealis Midler. 
Geographic distribution. — America to the limits of tree growth, 
including the Bahama Islands and Greater Antilles; also the Gala- 
pagos and Hawaiian Islands. 
Number of forms.— About a dozen forms of Lasiurus are now rec- 
ognized. 
Characters. — Dental formula: 
-2 -. 1. -2-4567^1-1 1-1 2-2 3-3_ on 
12 3. 1. -2-4567^3-3’ G \-V vm 2-2 ’ m 3-3“ dA 
Upper incisor short and robust, in contact with canine, the great- 
est diameter of crown nearly equal to its height, the crown subterete 
though slightly triangular in outline; lower incisors closely imbri- 
cated, trifid, the outer slightly larger than either of the others; 
