A REVIEW OF HADRURUS SCORPIONS (VEJOVIDAE) 1 HERBERT L. STAHNKE-This taxon, the popularly designated giant hairy so>rpii>ns, belongs to Vejovinae of the Vejovidae. The characteristics of the subfamily are : First four caudal segments with paired inferior median keels or their vestiges, three pair of lateral eyes of which the third pair is always the smallest : median ocular tubercle located just anterior to the middle of carapace; distinct median claw (unguicular spine) on pretarsus ; internal border of pedipalp tarsus with a single row of granules in non-overlapping rows, accompanied by widely spaced large granules on interior surface. Hadrurus Thorell I hid runts Thorell, 1876, Ann. Mag. Nat. Hist., ser. 4, vol. 17. p. 11; Kraepelin. 1899, Das Tierreich, Scorpiones und Pedipalpi, no. 8, p. 187 ; Pocock, 1902, Biologia Centrali-Americana, Scorpiones, Pedipalpi, Solfugae, p. 5 ; Ewing, 1928, Proc. United Slates Xatl. Mus., vol. 73, p. 7; Hoffman, 1931, An. Inst. Biol. Mexico, vol. 2, p. 334 ; Werner, 1934, in Bronn, Klassen und Ordnungen des Tierreichs, vol. 5, book 8, IVdipalpi, Scorpiones, p. 265; Stahnke, 1945, American Mus. Nov., No. 1298, 1945. Scorpions of the genus Hadrurus have an abundance of bristles on legs and cauda ; inferior border of men-able linger armed with very large, darkly pigmented tooth ; pedal spurs with denticulate spines, interior spurs with 3 to 4 teeth, exterior ones with 5 to 6 ; ratio of carapace length to posterior width 0.92-1.04; ratio of distance from anterior margin to anterior edge of median eyes to carapace length 0.46 to 0.50. Thus the carapace length approximates the posterior width and the median eyes are slightly forward of the middle of the carapace. Numerous (over 20) trichobothria on inferior edge of manus. ventral and exterior surfaces of pedipalp patella. Third marginal lamella longer than second. KEY TO THE SPECIES OF HADRl'Rl'S 1 Trunk concolorous brownish yellow except for dark median ocular tubercle; other structures lighter yellow. One-half genital opercular with 4 large setae ( Fig. 1 ) Hadrurus concolorous Stahnke 2 Trunk not concolorous ^ 3 (2) Anterior portion of ir,ten>cular triangle light yellow or slightly brownish r 4 (2 ) .Anterior portion of interocular triangle dark brown to black. ... 1 1 1 Accepted for publication October 15. l ( 'ti.s. 2 Poisonous Animals Research Laboratory, Ari/ona State University, lYmpr. Arizona 85281. 57
BioStor
