104 



ARACHNIDA. 



oedipodarum, which attaches itself to the body of an Oedipod, here 

 undergoes ecdysis, and, beneath the larval integument, a sac-like 

 pupal envelope without appendages, resembling the deutovum, 

 develops. From this the larval integument is for the most part 

 stripped off, but a portion remains covering the posterior third of 

 the body as a transparent integument, in which the three larval 

 limbs are still recognisable. A pupa is thus formed, following the 

 six-limbed larva and giving rise to the nymph (v. Frauenfeld, 

 No. 79). 



A. 



Fig. 55.— Larva of TromMdium fuliginosum. Formation of the pupa and nymph (after 

 Henking). au, eye; cd, proctodaeum j^-Pr,, larval limbs; r, proboscis (chelieerae and 

 pedipalps) of the larva; Ch, chelieerae; Ped, pedipalps; I\-P t , limbs of the nymph; 

 ut, primitive trachea; sh, intermediate integument. 



The processes that take place in Rhyncholophus help us to under- 

 stand the more complicated processes in TromMdium described by 

 Henking. The larva here, as in the cases already described, passes 

 into a resting stage. After having completely filled its intestine by 

 sucking the juices of Aphides, it creeps into earth. The body is 

 distended, and the soft parts withdraw from the chitinous skin. 



