CECIDOMYID^. 



879 



cecidomj'ian larvse, 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 fiimily. These eggs may be compared with the 



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

 large fatty 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 j'^oung worms like itself, and which are 

 finally born and may be compared with the wingless broods of 

 Plant-lice.* 



* Grimm thinks th;it the term "pseudova" is objectionable, as in the predo- 

 genetic Chinmomtis the winter ova. as well as the summer, or false ova, develop 

 without i)reviou3 fertilization by the male. 



