48 Annals Entomological Society of America [Vol. XIII,, 



enters the rectum, behind its middle, on the line where the 

 primary epithelial folds are in contact with the muscular tunic. 

 The muscles of each group then separate, running backwards and 

 forwards along this line and extending from the anus to the 

 junction of the colon and rectum. 



The Suspensorium of the Crop and Gastric Caecum is a thin 

 muscle originating from the anterior border of the pronotum near 

 the median line. One branch enters the latero-dorsal wall of the 

 crop near its middle and runs backwards towards the pro- 

 ventriculus ; another branch is inserted at the apex of the caecum 

 and divides into several smaller bundles which run backwards, 

 forming the longitudinal muscles of the caecum. 



The Alary Muscles of the Heart. There are ten of these 

 delicate fan-shaped muscles, one in the mesothorax, one in the 

 metathorax, and one in each of the eight anterior abdominal 

 segments. They originate in the dorsal diaphragm near the 

 median line beneath the heart, and are inserted near the lateral 

 end of the anterior border of the several tergites. 



