AMERICAN BATS OF THE GENERA MYOTIS AND PIZONYX 31 



Isotus KoLENATi, Allgcm. deutsch. Naturhist. Zeitung, Dresden, new ser., vol. 2, 



p. 131, 1856 {Vespertilio nattereri and V. emarginatus) . 

 Tralatitius Gray, Ann. and Mag. Nat. Hist., ser. 3, vol. 17, p. 90, February, 1866. 



(Modification of Trilatittis Gray, 1842.) 

 Pternopterus Petees, Monatsber. k. preuss. Akad. Wissensch., Berlin, p. 706, 

 1867 (subgenus of Vespertilio=Mi/otis, type, V. loMpes Peters=V espertUio 



muricola Hodgson), 

 Exochitrics Fitzingeb, Sitzungsber. kais. Akad. Wissenesch., Wien, math.-natur- 



wissensch. Classe, vol. 62, p. 75, 1870 (Vespertilio macro dactyl us, V. hors- 



fieldii^=V. adversus, and V. macrrjtarsus.) 

 Aeorestes Fitzinger, Sitzungsber. kais. Akad. Wissensch., "Wien, math.-natur- 



wissensch. Classe, vol. 62, p. 427, 1870 (Vespertilio villosissimus, V. al- 

 bescens, and V. nigricans). 

 Comastes Fitzinger, Sitzungsber. kais, Akad. Wissensch., Wien, math.-natur- 



wissensch. Classe, vol. 62, p. 565, 1870 (Vespertilio capaccinii, V. mega- 



podius, V. dasycneme, and V. limnophilus) . 

 Euvcspcrtilio Acloque, Fauiie de France, Mammiferes, p. 38, 1899 (Vespertilio 



emarginatus, V. mystacinus, V. murinus—myotis, V. nattereri, and V. bech- 



steinii). 

 Rickettia Bianchi, Ann. Mus. Zool. Acad. Sci., St. Petersburg, vol. 21, p. 



Ixxviii, 1916 (Vespertilio ricketti). 

 Dichromyotis Bianchi, Ann. Mus. Zool. Acad. Sci., St. Petersburg, vol. 21, p. 



Ixxviii, 1916 (Vespertilio formosus). 

 Paramyotis Bianchi, Ann. Mus. Zool. Acad. Sci., St. Petersburg, vol. 21, p. 



Ixxix, 1916 (Vespertilio bechsteinii) . 



Genotype. — Vespertilio tnyotis Borkhausen. 



Characters. — Vespertilionine bats with the maximum known 



2—2 1—1 3—3 



number of teeth present, the dental formula : i ^-g> ^ f— r> V"^ 5-01 



O O i"~l o — o 



3—3 

 w*K3o = 38; sternum, skull, teeth, and external characters primi- 

 tive for the group, none of them presenting any features of unusual 

 specialization. 



Distnhution. — Entire mainland of the Eastern and Western 

 Hemispheres to the limits of tree growth ; on the larger islands the 

 range extends to Japan, the British Islands, Newfoundland, Mada- 

 gascar, the Philippines, Samoa, and Australia, and, from South 

 America, to the southern Lesser Antilles. 



Rema/rks. — The bats of the genus Myotis constitute the most ex- 

 tensively distributed of any comparable group of land mammals. 

 Its range is approached in area by that of only two other genera, 

 the nearly related Eptesieus and Piyistrellus. A seeming anomaly in 

 distribution is the fact that the range is not yet known to include the 

 Greater Antilles. There is no unlikelihood, however, that further 

 research may show that some inconspicuous member of the genus 

 actually inhabits one or more of these islands or that the remains 

 of an extinct representative may be found as part of the imperfectly 

 known fauna whose traces have been left in the caves. Coincident 



