_Remarks._--This species is colonial; usually it is found in large numbers in favorite roosting sites, mainly in natural caves. Four of our specimens, caught in July, are females and two are young males. One, female, no. 944, has one embryo of 40 mm. in length. =Myotis yumanensis lutosus= Miller and Allen Yuma Myotis; Spanish, Murciélago de Yuma _Myotis yumanensis lutosus_ Miller and Allen, U. S. Nat. Mus., Bull., 144:72, May 25, 1928, type from Pátzcuaro, Michoacán. _Myotis yumanensis_, Miller, N. Amer. Fauna, 13:67, October 16, 1897. _Range._--Known only from Pátzcuaro and El Molino. _Remarks._--Originally recorded by Miller (1897:67) from Pátzcuaro, the animals from central México were named as a new subspecies by Miller and Allen (1928:72) who record one specimen from El Molino. =Myotis velifer velifer= (Allen) Cave Bat; Spanish, Murciélago Vespertino _Vespertilio velifer_ J. A. Allen, Bull. Amer. Mus. Nat. Hist., 3:177, December 10, 1890, type from Santa Cruz del Valle, Guadalajara, Jalisco. _Myotis velifer velifer_, Allen and Miller, U. S. Nat. Mus. Bull., 144:89, May 25, 1928. _Range._--Statewide. _Specimens examined_, 17: nos. 100083-100099, from 3 mi. NW Pátzcuaro, 6,700 ft. _Remarks._--Our specimens were taken on March 12, 1943, from a crevice in the wall of an abandoned chapel where 35 or more individuals of both sexes were living. Miller (1897:59) records the species from Pátzcuaro and Miller and Allen (1928:91) record it from there and also from Lake Chapala, La Palma, Acámbaro (now in Guanajuato) and Negrete. =Myotis thysanodes thysanodes= Miller Fringed-tailed Myotis; Spanish, Murciélago Colirugosa _Myotis thysanodes_ Miller, N. Amer. Fauna, 13:80, October 16, 1897, type from Old Fort Tejon, Kern County, California. _Range._--Known only from Pátzcuaro. _Remarks._--In the original description five specimens are recorded from Pátzcuaro and Miller and Allen (1928:127) mention the same locality of occurence. =Myotis californicus mexicanus= (Saussure) California Myotis; Spanish, Murciélago de California _V[espertilio]. mexicanus_ Saussure, Rev. et Mag. de Zoöl., 12 (ser. 2):282, 1860, type from somewhere in the warmer part of the state of México. _Myotis californicus mexicanus_, Miller, N. Amer. Fauna, 13:73, October 16, 1897. _Range._--Known in Michoacán only from Pátzcuaro. _Remarks._--Specimens from Pátzcuaro are recorded by Miller and Allen (1928:160). =Eptesicus fuscus miradorensis= (H. Allen) Big Brown Bat; Spanish, Murciélago Fusco _S[cotophilus]. miradorensis_ H. Allen, Proc. Acad. Nat. Sci. Philadelphia, p. 287, 1866, type from Mirador, Veracruz. _Eptesicus fuscus miradorensis_, Miller, N. Amer. Land Mamm., 1911, p. 62, December 31, 1912. _Range._--Probably statewide.