26 



The genus Heteromys. which is developed mainly in 

 Mexico and Central America, one species barely reaching 

 the lower Rio Grande valley in the United States, has been 

 added to the United States fauna, 1 and the number of 

 species raised from 3 in 1884 to 9, with an additional sub- 

 species, in 1894. 2 



The genus Perognathus has been increased from the 6 

 forms recognized in 1884 to 29. 3 The range of characters, 



Lepus ver<zcrucis Thomas, P. Z. S., 1890, p. 74, pi. vi. Jalapa, Mexico. 

 Lcpus insolitus Allen, Bull. Am. Mus. Nat. Hist., III., p. 189, Dec. 1890. 

 Plains of Colima, Mexico. 



Lepas truei Allen, ibid., p. 192. Mirador, near Vera Cruz, Mexico. 



'Allen, Bull. Am. Mus. Nat. Hist., III., pp. 268-272, June. 1891. See 

 also Allen and Chapman, ibid., V., pp. 218-220, Sept., 1893. 



2 Cf. Thomas, Ann. and Mag. Nat. Hist. (6), XL, 1893, pp. 329-332, and 

 ibid., XII., pp. 233, 234. 



The forms of this genus recently recognized by Mr. Oldfield Thomas appear 

 to be as follows : 



Heteromys alleni Coues. Tower Rio Grande Valley. (,Cf. Allen, as cited 

 above.) 



Hetetomys bulleri Thomas, Ann. and Mag. (6), XI., p. 330, April, 1893. 

 La Laguna, Sierra de Juanacatlan, Jalisco, Mexico. 



Heteroniys salvini Thomas, ibid., p. 331. Duefias, Guatemala. 



Heteromys salvini nigiescens Thomas, ibid., XII., p. 234, Sept., 1893. 

 Costa Rica. 



Heteromys pieties Thomas, ibid., p. 233, Sept., 1893. Mineral San Sebas- 

 tion, Jalisco, Mexico. 



Heteromys longicaiidus Gray, P. Z. S., 1868, p. 204. " Hondurus " (= 

 Venezuela, apud Alston, Biol. Cent. Am. Mam., p. 167.) 



Heteromys irroratus Gray, ibid., p. 205. Oaxaca, Mexico. 



Heteromys albolimbatus Gray, ibid., p. 205. La Parada, Mexico. 



Add also, to complete the list of the recorded species : 



Heteromys longicaudatus Gray, ibid., p. 204, Mexico. 



Heteromys desmarestianus Gray, P. Z. S., 1843, p. 79, and 1S68, p. 204. 

 Coban, Guatemala. 



Heteromys adspersus Peters, Monatsb. Ak. Berlin, 1874, p. 357. Panama. 



Heteromys anomahis (Thompson). Trinidad. 



3 Cf . Merriam, N. Am. Fauna, No. 1, pp. 1-29, pi. i-iv. Oct., 18S9. 



The following were here recognized by Dr. Mercian, of which 15 were de- 

 scribed as new : 



Perognathus fasciatus Wied. Upper Missouri, near its junction with the 

 Yellowstone. 



Perognathus fasciatus flavescens Merriam. Kennedy, Neb. 



