14 On the Classification of Scorpions. 



2. liateral eyes situated on the very margin of cephalothorax. 



Hands very flat Hormurus, n. ' 



Type I£. caudicula, (L. Koch), 1867. 



ft Tail rather strongly compressed, with keels both on the 



upper and underside . . Ischnurus, (C. L. Koch), 1837*. 



Type /. tricMurus, (Gerv.), 1844. 



B. Two principal lateral eyes on each side. 



a. " Tail with only three keels on the underside, thick, its keels strong. 



Frontal margin arcuato-emarginate. Sternum broader than long, 

 as broad as the labial lobes of the second pair. Hands broader 

 than high, strongly keeled. Two large principal eves on each 



side." (Pet.) *Urodacus,'' Pet., 18G1. 



Type U. nova hoUandics, Pet., 1861. 



b. The first four caudal joints with four keels on the underside. 



a. Sternum narrower than the labial lobes of the second pair to- 

 gether. Dorsal eyes situated far in front of the centre of cepha- 

 lothorax ; the tubercle on which they are placed not grooved 

 longitudinally. Hands thick, convex, the hand-back turned 

 rather more downwards than upwards. Tail keeled on all sides. 

 Besides the two principal eyes, there is sometimes an accessory 

 eye on one or both sides of cephalothorax. 



BuoTEAS, (C. L. Koch), 18-37. 

 Type Broteas Herbstii, n. ^ 



^. Sternum as broad as the labial lobes of the second pair together, 

 t " Sternum longer than broad. Hind margin of cephalothorax 

 angulato-emarginate. Hands flat, angular. The hind lateral 

 eye sometimes divided into two." (Pet.) 



*ScoRPioPs, Pet. 1861. 

 Type ScorpiojK HardwickU , (Gerv.), 1844. 



tt Sternum broader than long. Hand-back forming, with the 



upperside of the hand, a right or obtuse angle. Only two 



lateral eyes on each side. 



1. Dorsal eyes situated nearly in the middle of cephalothorax, 



which is emarginate in front; dorsal eye-tubercle divided 



by a longitudinal middle groove. Hands rather thick. Tail 



somewhat strong, with strongly marked keels on all sides. 



loCTONUS, n. * 

 Type I. mmiicatus, n. ' 



^ opfios, necklace ; olpa, tail. 



* The place of *JIemiscorpuis, Pet., is probably in the vicinity of this 

 genus. It is characterized by Peters in the following words : — " Sternum 

 as broad as the labial lobes of the second pair. Frontal margin scarcely 

 emarginate. Body and extremities flattened. Tail slender, long, higher 

 than broad, keeled, its sirth Joint tvith two lateral tubercles ( in the males) 

 behind the base of the .short stiug. The hind lateral eye somewhat smaller, 

 placed more inwards." 



If the tubercles mentioned by Peters also exist in the females, Hemi- 

 scorpius is without doubt a good genus. 



3 = Scorpio (Brotheas, Chactas) mattrvs, DeGeer, script, recent, (non 

 Linn.). 



* lor, poison ; kt(ivu>, kill. 



' loctonus manieatus, n. 



Fuscus, palporum costis nigi-is, vesica fusco-testaceo lineata, pedibus apice 



