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HADKUEUS, 



a 3 . Three lateral eyes on each side ; lower surface of tail keeled; 



tarsi furnished beneath with a median row of short spicules. 

 a 4 . Intermediate lamellae of the pectines not broken up into 



subequal sclerites ; stigmata long, slit-like ..... Anuroctonus, Pocock. 

 b\ Intermediate lamellae of the pectines distally broken up 



into about six subsimilar sclerites ; stigmata short, sub- 



oval 



b s . Two lateral eyes on each side; lower surface of caudal 



segments 1-4 keelless (in the Central- American species) ; tarsi 



Uroctonus, Thorell. 



without median row of spicules; stigmata oval .... Broteochactas, Pocock. 

 b. Caudal segments furnished with a single inferior median keel ; two 



lateral eyes ; two rows of small teeth on the fingers of the chelae. 

 a 5 . Pectines with distinct fulcra ; stigmata elongate, slit-like . . . Plesiochactas, Pocock, 

 b 5 . Pectines without distinct fulcra ; stigmata short, crescentic . . Megacormus, Karsch. 



HADRURUS. 



Hadrurus, Thorell, Ann. & Mag. Nat. Hist. (4) xvii. p. 11 (1876) ; Atti Soc. Ital. Sci. Nat. xix. 



p. 189 (1877) (part.) ; Karsch, Mittheil. Munch, ent. Ver. iii. p. 21 (1879) (part.) ; Pocock, 

 Ann. & Mag. Nat. Hist. (6) xii. p. 92 (1893) ; op. cit. p. 329 (sensu stricto) ; Kraepelin, 

 Jahrb. Hamb. Wiss. Anst. xi. p. 206 (1894) ; Das Tierr., Scorpiones et Pedipalpi, p. 188 



(1899). 



Movable finger of mandible armed beneath with a strong and long tooth. Tarsi furnished below with a median 

 row of spicules and paired lateral setae ; a large inferior claw present. Pectines long, with numerous 

 spherical fulcra and the intermediate lamellae represented, except basally, by a row of spherical sclerites. 

 Sternum short and wide, deeply impressed mesially. Stigmata elongate. Fingers of chelce furnished with 

 7-8 median rows of teeth, flanked on each side with isolated larger teeth. Carapace with convex anterior 

 border : ocular tubercle in the middle. Tail long and strong. 



Type H. hirsutus, Wood. 



Distribution. South-western area of the United States and Mexico. 





Synopsis of the Species. 



a. Frontal area of carapace closely and finely granular ; the tubercle very finely - 



granular ; the terga also very finely and closely granular, with some coarser 

 granules interspersed upon the posterior elevated area ; sterna finely and 



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closely granular laterally, the last with four granular keels and additional 

 granules in the middle of its area ; median and lateral keels of fourth and 

 fifth segments coarsely granular, superior lateral portions of fourth and fifth 

 segments thickly and coarsely granular; hand and brachium finely and 

 closely granular; upperside of hand with some coarse granules near the 

 inner edge and many on the edge ; coxae of legs shagreened ; movable finger 

 longer than carapace . • hirsutus, Woodo 



b. Frontal area of carapace somewhat sparsely studded with large rounded 



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granules, the intervening areas perfectly smooth, as is the ocular tubercle; 

 terga mostly smooth in front and mesially ; last sternum smooth in the 



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