KONGL. SV. VET. AKADEMIENS HANDLINÖAR. BAND. 21. N:0 9. 23 



IV. CLASSIFICATION OF THE SCORPIONS. 



CoKDA proposed (1. c, 1835, p. 38) to divide the scorpions into two groups: l:o 

 Opisthophthalmi^), with the dorsal eyes situated hehind the lateral eyes, and 2:o Pros- 

 ophthalmi, with the dorsal eyes placed in front of the lateral eyes. To the first group 

 he referred all the recent scorpions, to the latter his Cydophthalmus senior, the only 

 fossil species then known. The discovery of the Eoscorpii, which are so nearly related 

 to Cydophthalmus, but have the dorsal eyes placed betiveen the two groups that are 

 formed by the lateral eyes, and especially the find of Palceophoniis, constrains us, how- 

 ever, to abandon the classification adopted by Corda. We propose instead to group 

 the scorpions in the following manner, giving at the same time a list of the fossil spe- 

 cies hitherto known. 



Ordo SCORPIONES Sund. 1833. 



Subordo I. APOXYPODES n.^) 



Last joint of tarsus gradually tapering and pointed, without claws (or, perhaps, 

 provided with a single very small claw) at the tip. — Silurian. 



Fam. PAL/EOPHONOID/E n. 



Sternum large and pentagonal, bounded anteriorly by the coxse of the third pair. 

 Movable finger of the mandibles apparently armed with a single row of teeth. 



Gen. PAL^OPHONUS Thor. et Lindstr. 1884. 



Anterior margin of cephalothorax very broadly emarginate. Dorsal eyes, if pre- 

 sent, not unusually large. 



') C. L. KocH gave in 1837 (1838 ?), in Die Arachniden, IV, the name Opisthopkthalnms to a genus of 

 Scorpions. 



^) ano^vvio, to point; novg, foot. 



