12 Prof. T. Thorell on the 



Subfam. 2. Pandinini. 



The movable mandibular finger provided with a single 

 row of teeth, situated in its upper margin. 



A. Three principal lateral eyes on each side. 



A. " Joints of the tail rounded, without keels. Dorsal eyes behind the 



centre of cephalothorax "^ *Dacub,'us, Pet., 1861, 



Type Z>. galbineus, (C. L. Koch), 1838. 



B. Tail evidently keeled. 



o. " A spine under the base of the sting. Dorsal eyes situated just 

 behind the first third of cephalothorax. Body, palpi, and tail 

 as in Heterometrus, Henipr. et Ehr." {Pet.). 



*DiPLOCENTKUS, Pet., 1861. 

 Type D. mexicanus, Pet., 1861. 

 h. No tooth or spine under the sting. 

 a. Lateral eyes removed from the lateral margin of cephalothorax. 

 Hand-back forming an acute angle with the upperside of th© 

 hand, 

 t Dorsal eyes not very far removed from the centre of cephalo- 

 thorax. Underside of tail provided with three longitudinal 

 grooves, and with granules arranged in at least four longi- 

 tudinal rows. Labial lobes of the second pair together from 

 half as broad again to double as broad as sternum. 

 § Cubitus rounded off anteriorly ; its anterior side not sepa- 

 rated by a strong margin or ridge from the upper and 

 under surfaces. (Dorsal eyes situated nearly in the centre 

 of cephalothorax. The infero-lateral keels of the fifth 

 caudal joint are, towards the apex, diverging and curved 

 rather strongly upwards. Hands not much compressed 

 on the inner side. Anterior margin of cephalothorax 

 rather broadly emarginate.) 



HETEKOMETRtrs, (Hempr. et Ehr.), 1829. 

 Type H. maurus (Linn.), 1758^ 



§§ Cubitus subprismatic, with the anterior and superior 

 sides plain ; anterior side subrectangular, limited both 

 above and below by a very distinct dentate or gra- 

 nulate margin. 

 * Anterior margin of cephalothorax rather broadly and 

 deeply emarginate, its frontal lobes rounded. 

 1. Inner margin of the hands strongly compi'essed, 

 thin. (Dorsal eyes situated a little behind the centre 



of cephalothorax^) Pandinus, n.* 



Type P. africanus, (Linn.), 1754. 



^ According to Peters ; 0. L. Koch, however, says of his Centrurus gal- 

 bineus (Die Arachn. iv. p. Ill) : — " Die Seitenkiele und die unteren Kiele 

 zwar vorhanden, aber in niclit sehr starkem Ausdrucke." The hands 

 are said to be ''schmal, an der Aussenseite uneben, ohne deutliche 

 Kiele." Koch gives this species ten eyes (?). 



"^ — H. palmatus, Hempr. et Ehr. 



3 The measures are taken from the eyes to a straight line tangent to 

 the anterior margins of the frontal lobes, and to the middle of the poste- 

 rior margin of the cephalothorax. 



* Tvavhfivoi, quite terrible. 



