THE FAMILIES AND GENERA OP 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 Dotason. 



1875. Glauconycteris Dobson, Proc. Zool. Soc. London, p. 383 (subgenus 



of Chalinolobus) . 

 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 -) 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. Atalapha Petebs, Monatsber. k. preuss. Akad. Wissensch., Berlin, p. 



907. Not Atalapha Rafinesque, 1814. 

 1878. Atalapha Dobson, Catal. Chiropt. Brit. Mus., p. 267 (part). 

 1894. Atalapha H. Allen, Monogr. Bats N. Arner. (1893), p. 141, March 14, 



1894. 

 1897. Lasiurus Miller, North American Fauna, No. 13, p. 105, October 16, 

 1897. 

 Type-species. — Vespertilio borealis Miiller. 



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.-3-4567 -1-1 1-1 2-2 3-3 

 123.1.-2-4567 * 3^3' C \=V ? m 2^2' m 3^3 =32 - 



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; 



