NO. 7 MUSCULATURE OF COLEOPTERA — DORSEY 33 



Further investigations are necessary to determine the nature of 

 the complete act of the ingestion of food by chewing insects. The 

 facts presented in this paper indicate, however, that the cibarial, 

 pharyngeal, and hypopharyngeal muscles, which are powerfully de- 

 veloped in many species, play an important part in ingestion. The 

 action of these muscles is undoubtedly supplemented by that of the 

 labial muscles to a varied degree depending on the species. 



