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Sissom, W. David, and James R. Reddell, 2009. Cave scorpions of Mexico and the United States [Escorpiones de cuevas de México y Estados Unidos]. Texas Memorial Museum Speleological Monographs, 7. Studies on the cave and endogean fauna of North America, V. Pp. 19-32.

Abstract:
Scorpions reported from caves in Mexico and the United States
are reviewed. New records are included for: Centruroides gracilis,
C. vittatus, Troglocormus willis, Alacran tartarus, Pseudouroctonus
apacheanus, P. reddelli, Uroctonites sequoia, Serradigitus gertschi
striatus, S. wupatkiensis, Vaejovis carolinianus, V. chisos, V.
intermedius, V. nigrescens, and V. rossmani.

PDF LINK

Francke, Oscar F. 2009. Description of a new species of troglophile Pseudouroctonus (Scorpiones: Vaejovidae) from Coahuila, Mexico [Descripción de una nueva especie de Pseudouroctonus troglófilo (Scorpiones: Vaejovidae) de Coahuila, México]. Texas Memorial Museum Speleological Monographs, 7. Studies on the cave and endogean fauna of North America, V. Pp. 11-18.

Abstract:
Pseudouroctonus savvasi, n.sp., is described from specimens
collected in two separate caves in the state of Coahuila, México,
though it does not exhibit any marked troglomorphies. It is most
closely related to Pseudouroctonus apacheanus (Gertsch and
Soleglad), from which it is clearly differentiated by size, the number
of teeth on the movable finger of the chelicerae, hemispermatophore
morphology and pedipalp chela morphometrics.

PDF LINK

Francke,O. F., and W.E. Savary. 2006. A new troglobitic Pseudouroctonus Stahnke (Scorpiones: Vaejovidae) from northern México. Zootaxa, 1302:21-30.

Abstract:
Pseudouroctonus sprousei sp. nov., from El Abra cave, in Coahuila, México, is described from a
single adult male. It is most similar to Pseudouroctonus reddelli (Gertsch and Soleglad), a well known
troglophile from Texas and Coahuila, which is also the type species for the genus
Pseudouroctonus Stahnke.

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Everyonce in while we receive pictures from email for information.

This picture was sent by Debi from near Mexico City, Mexico(22.Nov.09).  

 Tentative ID to the Vaejovis mexicanus group: