400 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I37 



side of the mandible to the roof of the head and its hind wall, re- 

 spectively. And finally the muscles h are seen, a lot of muscles radi- 

 ating from the entire inside of the cavity of the mandible and uniting 



0.05 mm 



Fig. 15. — Campodea plusiochaeta Silv. Head, dorsal, with antennal (a) and 

 mandibulary muscles {b-i) ; see text. 



below the oesophagus with the corresponding ones from the mandible 

 of the other side ; a broad ligamentous band connects them. The 

 other muscles in figure 15 are antennal muscles (o) or head muscles 

 without connection with the mouth parts ; they have been drawn be- 



