TYPE ARACHNIDA. 



445 



possess any sting or poison-gland. The chelicerae are chelate, 

 but the pedipalps are long and leglike and possess glands 

 which in Galeodes have been supposed to be poisonous. The 

 anterior pair of legs lacks the terminal uugues found on the 

 others, and functions as a second 

 pedipalp rather than a walking-leg. 

 No appendages occur on the abdo- 

 men. 



Three pairs of stigmata occur 

 on the ventral surface of the body, 

 the most anterior pair being situ- 

 ated on the first thoracic segment, 

 while the other two are on the 

 second and third abdominal seg- 

 ments. The anterior position of the 

 first pair is probably to be regarded 

 as secondary, and produced by a 

 forward migration of the pair which 

 should occur upon the first abdomi- 

 nal sement. The stigmata lead 





FlG ' 203.-<7fe^ spinipalpus 



(from CUVIER). 



into tubular tracheae which branch 



extensively. A comparatively simple heart is situated in the 



abdomen. 



The mid-gut possesses numerous branched diverticula as 

 well as Malpighian tubiiles. The nervous system consists of 

 a syncerebrurn connected with a subcesophageal mass which 

 represents all the thoracic and abdominal ganglia fused to- 

 gether. Two eyes are present, situated on a common eleva- 

 tion at the front edge of the head. 



The reproductive organs resemble those of the Scorpions 

 except that transverse anastomoses do not occur, and the gen- 

 ital opening is situated upon the ventral surface of the first 

 abdominal segment. 



The Solifugse is a small order living more especially in 

 warm sandy regions. They are usually, on rather insufficient 

 grounds, supposed to be capable of inflicting a poisoned 

 wound. Only two genera, Solpuga and Galeodes, belong to 

 the order. 



