332 
[May 2, 
ill tho tniclu'al system, wliile for llit' simple ocelli of the Piili- 
cidae, as also for the deep lateral cavity of the head, there are 
analogies in the Rhynchota but not in the Diptera (Kraepelin). 
i 
Fig. 18. A, arnuentary canal of Pulex caiiis ; uc* oosopliajius ; pm, 
proventricukis; st, stomach; t, intestine; «?•.<, urinary tubes; I. i, large 
intestine ; r.r/l, rectal glands ; r, rectum ; B, teetli-Iike processes lining 
tlie proventricukis; C, one of tlie six rectal glands, sliowing the trachea 
and its branches. — After Laudois. 
