2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



PAGE 



XIII. Scarabaeoidoa iq 



Scarabacidae ig 



Lucanidae ip 



XIV. Cleroidea 21 



Dermestidae 21 



Cleridae 21 



Ostomatidae 22 



XV. Meloidea 22 



Meloidae 22 



XVI. Mordelloidea 23 



Mordellidae 23 



XVII. Cerambycoidea 23 



Cerambycidae 23 



Cerambycinae 23 



Prioninae 23 



XVIII. Bostrichoidea 25 



Bostrichidae 25 



XIX. Chrysomeloidea 25 



Chrysomelidae 25 



Donaciidae 25 



Galerucidae 25 



XX. Platystomoidea 27 



Platystomidae 27 



XXI. Curculionoidea 27 



Curculionidae 27 



Scolytidae 27 



Brentidae 28 



XXII. Lymexyloidea 29 



Lymexylidae 29 



Summary 30 



Muscles considered in this study 34 



Literature consulted 35 



Abbreviations used on the figures 36 



Explanation of the plates 2)1 



INTRODUCTION 



This paper presents the results of a comparative study of the muscle 

 arrangement in certain regions of the insect head and stomodaeum. 

 A preliminary study was made in Orthoptera, Dermaptera, Hymen- 

 optera and Neuroptera, and was followed by a similar but more in- 

 clusive study of representatives of adult and immature stages of the 

 order Coleoptera. 



Several species of orthopteroid insects were dissected to determine 

 the muscular arrangement in a generalized form of insect. The other 

 orders are included to observe similarities with and variations from 

 the type of muscle system in Orthoptera, of which Periplaneta ameri- 

 cana L. is chosen as the most generalized form. 



