xn CLASSIFICATION 307 



The DIPLOCENTRINAE have a spur under the aculeus. Tin > 

 form a small group of only eight species. The principal genus, 

 Diplocentrus, is entirely Neotropical, but Nebo has a single Old 

 World representative in Syria. 



The URODACINAE, with the single genus Urodacus, art- 

 Australian scorpions. As in the next sub-family, there are 

 rounded lobes on the tarsi, but there is only a single keel on the 

 " tail," and the lateral eyes are two in number. Six good and 

 three doubtful species are recognised. 



The SCORPIONINAE are Asiatic and African forms, and are 

 recognised by the tarsi having a large lobe on each side, by the 

 convex upper surface of the "hand," by the presence of two 

 median keels on the "tail," and by the possession of three lateral 

 eyes. Palamnaeits (Heterometrus) has sixteen species in the 

 Indian region. There are about thirty species of Oj>ixfln>i>Ji- 

 tlialmus, all natives of South Africa. Pandimis includes about ten 

 species, but there are only two species of the type genus Scorp'm. 

 8. maurus and S. boelimei. 



The sub -family HEMISCOEPIONINAE was formed for the 

 reception of the single Arabian species Hemiscorpion leplurn*. 

 Its most striking characteristic is the cylindrical vesicle of the 

 tail in the male. 



The ISCHNUKINAE differ from the Scorpioninae chiefly in the 

 absence of the tarsal lobes, the presence of a. well-marked lin-ri- 

 keel, and the generally more depressed form of the body and 

 hand. In the opinion of some authors they should he septupled 

 from the Scorpionidae as a distinct family, the Ischnuridae. 

 There are more than twenty species, divided among six 

 The type genus Ischnurus has only the single species /. 

 There are eight species of Opisthacanthus, which IMS representa- 

 tives in Africa and America. 



Fam. 3. Chaerilidae. - - Sternum p<??/ /"////"/ ////// 

 depression or " sulcus" rounded posteriorly. Two jn-<l<.il 

 X/i</iiKi(it r'nrular. Tivo lateral eyes willi- a //<'//<>// */'/ ln-/ii/id 

 tin' si'cii/n/. /'< i-/i Hi's very slnn'l. 



This small family has the single genus f'/nn r////x with hut. 

 seven s]ecies, natives of the Oriental ivginn. 



Fam. 4. Chactidae.- Tn-<> /mini */////*. 

 (in-, rarely, no eyes) lut without //illnn- x/ml. Character 

 dentition on movable finger of " ha ml." 



