SOLIFUGJ3. 



511 



etc. ; they run rapidly laterally and backwards, and live on mites 

 and small insects. 



Fam. Chernetidae. Chelifer cancroides L. Book-scorpion with two eyes. 

 OMsium isclinosccles Herm., with four eyes. Chthonhis trombidioidcs Latr. 

 (fig. 412). 



Order 8. SOLIFUG.E.* 



Spider-like animals with separated head and thorax, with elongated, 

 segmented abdomen ; sub-chelate chelicerce and pediform pedipalpi. 

 Respiration is effected by means of tracheae. 



The Solifugce ap- 

 proach insects in the 

 segmentation of the 

 body. The cephalo -tho- 

 rax is divided into two 

 regions of which the an- 

 terior is comparable to 

 the insect head, the pos- 

 ' terior (composed of three 

 segments) to the insect 

 thorax. The long cylin- 

 drical abdominal region, 

 which is composed of 

 nine to ten segments, is 

 quite distinct (fig. 413). 

 The body is closely 

 covered with hairs. The 

 oral apparatus consists 

 of powerful chelicerae, 

 which end in a large 

 vertically placed chela, 

 the lower arm of which can be moved perpendicularly against 

 ^the upper. The pedipalpi serve as ambulatory legs, but are with- 

 out claws, which are found only on the three posterior pairs 

 of legs. The latter arise from the three free thoracic rings, and 

 bear peculiar cutaneous lamellae at their base. The anterior 

 pair of legs belongs to the head and may be considered as a 

 second pair of pedipalpi (maxillary palps). The Solifugce pos- 

 sess two large projecting simple eyes, and respire like insects by 



* L. Dufour, " Anatomic, physiologic et histoire naturelle des Galeodes,'' 

 Comptesrendiis d I'acad. des sciences, XLVL.185S. Th. Button, " Observations 

 on the habits of a large species of Galeodes," Ann. and Mag. of Nat. Hist., 

 XII., 1843. 



FIG. 413. Galecdes arancoides (r&gne animal). 



