Bulletin of the Museum of Comparative Zoology 



AT HARVARD COLLEGE. 



Vol. XL. No. 7. 



THE CHANGES WHICH OCCUR IN THE MUSCLES OF A 



BEETLE, THYMALUS MARGINICOLLIS CHEVR., 



DURING METAMORPHOSIS. 



Bt Robert S. Breed. 



With Seven Plates. 



CAMBRIDGE, MASS., U.S.A.: 



PRINTED FOR THE MUSEUM. 



October, 1903. 



