CECIDOMYID^E. 



379 



ceciclomyiau larvae, with the division between the segments in- 

 dicated by rows of minute spines. From the germ-balls (a, 

 nearest the posterior end of the body) the embryo is gradually 

 formed (as at a in the eighth and ninth rings of the body), 

 when they assume a cylindrical form like the eggs of the adult 

 fly of this family. These eggs may be compared with the 



Fig. 285. 



Fisr. 2x>;. 



Fig. 2S7. 



Fig. 288. 



Fig. 289. 



Fig. 2!)0. 



Fig. 201. 



TTirr O(V> 

 J? 1- . -J-. 



Fig. 293. 



Fig. 294. 



Fig. 295. 



Fig. 290. 



"pseudova" of the Aphis, and are developed from the two 

 large fatty bodies (corpora adiposa) which are situated one on 

 each side of the bod} r . These "false eggs" increase in num- 

 ber and develop until the entire cavity of the mother larva be- 

 comes distended with young worms like itself, and which are 

 finally born and may be compared with the wingless broods of 

 Plant-lice.* 



* Grimm thinks that the term "pseudova" is objectionable, as in the predo- 

 genetic Chirnnnmns the winter ova, as well as the summer, or false ova, develop 

 without previous fertilization by the male. 



