Miastor ? americana Felt 



1 Mother larva containing an embryo extending from about the fifth to the 

 tenth body segments and showing an early stage in the development of the 

 mesodermal tissue, x lOO. A portion of the latter more enlarged as illus- 

 trated on plate 33, figure i. 



2 Small, yellow mother larva containing an embr>^o extending from the fourth 

 to the twelfth segments and showing in the posterior part of the embryo 

 a conspicuous mass of large-celled mesodermal tissue with distinctly 

 rounded extremities, x 100 



3 Small, yellow mother larva containing a nearly developed embryo showing 

 the three-rowed condition due to an increase in the embryonic adipose tissue 



.and a correlated decrease in the mesoderm, x 100 



All on this plate are arranged with the head of the mother larva up, the 

 -anterior extremity of the embryo being toward the bottom of the plate. 



174 



