Type locality. Nuevo León: Bustamente, Gruta del Palmito (Holotype at NMNH, examined).
Published records. None.
New records. None.
Remarks. Known only from the type locality, N. pelaezi is the northernmost species in the genus; Chamberlin (1943) reiterated the type locality, and Nicholas (1962) noted that this cave was the only known site. The holotype, a juvenile, has unique, forked, paramedian sulci on tergite 1, but its anatomical characteristics may not be completely developed. Because of this feature, Schileyko & Minelli (1999) retained N. pelaezi as a valid species, as do we. An adult is needed to accurately diagnose this species.