222 Field Columbian Museum — Zoology, Vol. III. 



Perognathus helleri. 



Perognathus helleri. Elliot, Pub. Field Columb. Mus., iii, 1903, 

 p. 166. 



19 Specimens, San Quentin, Gulf of California. 



"The most abundant mammal about the bed of the San Simon 

 River." 



Perognathus fallax. 



Perognathus fallax. Merr., N. Am. Faun., 1889, No. i,p. 19, PI. 

 iii, fig. 14, Elliot, Syn. N. Am. Mamm., 1901, p. 254. 



39 Specimens: 5 Ensenada, 1 Trinidad, 2 Agua San Matias, 15 

 San Antonio, 1 Mattoni, 1 head of San Antonio River, 1 Agua 

 Joncolito, n Rosarito, 2 San Quentin. 



Perognathus cnecus. 



Perognathus cnecus (misprinted knekus). Elliot, Pub. Field 

 Columb. Mus., iii, 1903, p. 169. 



1 Specimen from Rosarito, west of San Pedro Martir Mts. 



Perognathus femoralis. 



Perognathus femoralis. Allen, Bull. Am. Mus. Nat. Hist., 1891, 

 p. 281. 



3 Specimens, Hanson Lagoon, Hanson Laguna Mts. 



Perognathus femoralis mesopolius. 



Perognathus femoralis mesopolius. Elliot, Field Columb. Mus., 

 iii, 1903, p. 168. 



13 Specimens: 2 Pifion; 5 Aguaje de Las Fresas, 4 Santa Rosa, 2 

 Santa Eulalia, San Pedro Martir Mts. 



Perognathus spinatus. 



Perognathus spinatus. Merr., N. Am. Faun., No. 1, 1889, p. 21. 

 Elliot, Syn. N. Am. Mamm., 1901, p. 255. 



40 Examples: 9 Agua San Matias, 7 Canon Esperanza, 1 

 Canon Diablo, 5 San Antonio, 7 Parral, 10 Mattoni, San Pedro 

 Martir Mts.; 1 Palomar, Hanson Laguna Mts. 



At Canon Esperanza, San Matias Springs, and San Antonio this 

 species was abundant. At the first of these localities Mr. Heller 

 writes, "in March none were taken, but on my return I placed traps 

 in the same situations where Peromyscus had been previously taken, 

 but nothing save Perognathus was obtained. It would appear that 

 they had migrated into the canon since my departure or awoke 

 from some sort of dormant state or hibernation." 



