CECIDOMYID^E. 



379 



cecidonryian 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 

 tlv of this family. These eggs ma}' be compared with the 



Fit;'. 285. 



Fig. 28fi. 



Fiir. -28s. 



Fig. 28! I. 



Fig. _".). 



Fig. 2!)1. 



Fig. 2112. 



Fig. -2!):!. 



Fig. 21)4. Fig. 2!0. Fig. 290. 



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

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

 each side of the body. 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 psedo- 

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

 without previous fertilization by the male. 



