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Summary
On the basis of all the published data, the 90 cervicothoracic muscle types found in the Lepidoptera are classified and their distribution among the various species is indicated. The muscles are grouped into 19 topographical categories under each of the four body regions: cervix, prothorax, mesothorax, and metathorax. A brief morphological discussion is given for each muscle type, and some information on its representation in other neuropteroid insects is included.