English: Carapaces and chelae of Hadrurus and Hoffmannihadrurus showing the variability in coloration and its patterns. Of particular interest is the range of variability in Hadrurus concolorous (Figs 6–9, 14–15) exhibiting dark coloration patterns essentially identical to Hadrurus pinteri (Figs 5, 13) to pale yellow with little or no patterns. Also of interest is the darken posterior half of the carapace in Hoffmannihadrurus gertschi, matching the same area that is also darkened in Hoffmannihadrurus aztecus 5, 13 Hadrurus pinteri, male, San Miguel de Comondú, Baja California Sur, Mexico 6 Hadrurus concolorous, female, Tambobiche, Baja California Sur, Mexico 7, 14 Hadrurus concolorous, male, San Miguel de Comondú, Baja California Sur, Mexico (same locality as Hadrurus pinteri in Fig. 5) 8 Hadrurus concolorous, male, Santa Rosalia, Baja California Sur, Mexico 9, 15 Hadrurus concolorous, male, Las Bombas, Baja California Sur, Mexico 10 Hadrurus hirsutus, male, Cabo San Lucas, Baja California Sur, Mexico 11, 16 Hoffmannihadrurus gertschi, female paratype, Azcala, Guerrero, Mexico 12 Hoffmannihadrurus aztecus, female, Tehuacán, Puebla, Mexico.