Compiled and Edited by:
Nancy B. Simmons and Andrea L. Cirranello
American Museum of Natural History

Your search for Myotis carteri resulted in 1 species-level match:

Myotis Kaup, 1829. Skizz. Entwickel.-Gesch. Nat. Syst. Europ. Thierwelt 1: 106.

Vespertilio myotis Borkhausen, 1797

Myotis carteri LaVal, 1973.
Sci. Bull. (Los Angeles, CA) .
Carter's Myotis

Mexico, Jalisco, 16 miles NE Tamazula

Nayarit through S. Mexico State (Mexico)

CITES - Not Listed IUCN - Not Evaluated (raised from synonymy).

Often included in nigricans, but likely distinct; see Bogan (1978) and Ceballos et al. (2014), but see Corbet and Hill (1980), Simmons (2005), and Haslauer (2019) for an alternative view. Requires additional research.

References:

Bogan, M.A. 1978. A new species of Myotis from the Islas Tres Marias, Nayarit, Mexico, with comments on variation in Myotis nigricansJournal of Mammalogy 59: 519-530. Read abstract.

Ceballos, G. J. A. Cabrales, and D. Vasquez. 2014. Order Chiroptera.  Pages 667-838 In Ceballos, G (eds.) Mammals of Mexico. Baltimore: John Hopkins University Press. Read abstract.

Corbet, G.B., and J.E. Hill 1980. A World List of Mammalian Species, second edition. British Museum (Natural History) Publications, London: 1-226. Not available online.

Haslauer, R. 2019. Myotis nigricans.  Pages 945-946 In D.E. Wilson and R.A. Mittermeier (eds.) Handbook of the Mammals of the World, vol. 9. Barcelona: Lynx Edicions. Not available online.

LaVal, R.K. 1973. A revision of the Neotropical bats of the genus MyotisScience Bulletin, Natural History Museum of Los Angeles County 15: 1-54. Not available online.

Simmons, N.B. 2005. Chiroptera.  Pages 312-529 In D.E. Wilson and D.M. Reeder (eds.) Mammal Species of the World: A Taxonomic and Geographic Reference, 3rd edition, Volume 1. Baltimore: Johns Hopkins University Press. Read chapter.