Sissom and Hendrickson 2005:39,40,41 -  Key to the Vaejovid Scorpion Species of Northeastern México  - Dorsolateral carinae of metasoma (at least on segments I–III) with an enlarged terminal denticle; legs I–III with irregular setation (except in V. globosus, which has setal combs, – but has the enlarged terminal denticle on the metasoma); Trichobothria ib and it situated at base of chela fixed finger; Pectinal tooth counts greater than 14 in males, greater than 11 in females; pedipalp chela with ventral face rounded, with or without ventromedian carina; chela movable finger length/chela palm width ratio greater than 1.8; adults variable in size and color; Cheliceral movable finger with ventral margin smooth; Pedipalp patella with 2 esb trichobothria; Ventral submedian carinae present (usually weak on I–II, stronger on III–IV); metasoma with paired setae (on segments I–IV, usually 3–6 pairs) and no more than one or two setae in the intercarinal spaces; pectinal tooth counts less than 20 in males, less than 18 in females; Body color light yellow brown to brown (if brown, with distinct mottling); adult body length less than 35 mm in both sexes; Pectinal tooth counts 10–13 in females, 12–14 in males; pedipalp chela length/width 3.10–3.90; smaller scorpions, with adult females reaching no more than 26 mm in length............................................................................................................ Vaejovis rossmani