1 66 HUGH GLASGOW. 



PLATE VI. 



FIG. 1 6. Largus sinctus, posterior portion'of alimentary canal with caeca. 



FIG. 17. Dysdercus suturellus, posterior portion of alimentary canal of male, 

 showing total absence of caeca in this sex. 



FIG. 18. Dysdercus sulurellus, posterior portion of alimentary canal in female 

 showing development of the caeca in this sex. 



