Annals Entomological Society of America [Vol. XI, 



Explanation of Plate. 

 Fig. 1. Sagittal section through the posterior end of an embryo of Stage XII. 



X 260. 

 Fig. 2. Sagittal section through the posterior end of a recently hatched larva. 



X 260. 

 Fig. 3. Sagittal section through the 8th abdominal and terminal ganglia of a 



larva three days old. X 260. 

 Fig. 4. Sagittal section through the terminal ganglion of a mature larva. X 260. 



Abbreviations: Gng 8-11 — abdominal ganglia 8-11; H Int — hind-intestine; 

 Mint — mid-intestine; TraCom — tracheal commissure of the 8th abdomnal segment. 

 Abdominal segments indicated by numerals. 



