ii8 THE INTEGUMENTAL SKELETON OF THE IMAGO. 



of the under surface of the head this I term the ' pars 

 basilaris.' The lateral parts of the metacranial annuli some- 



FIG. 22. The Integumental Skeleton of the Head of an Ear\vig(/w/?<v/Az aitricularia) : 

 i, lateral aspect ; 2, interior of one lateral half ; j>, anterior, and 4, posterior 

 aspect : a, antenna ; e/>, epistome ; ep c, epicephulon ; /, frons ;/<*, face ;/, para- 

 cephalon ; g, gula ; /, labrum ; tnd, mandible ; vix 1 , maxilla ; w.v-, labium ; o, 

 occipital foramen ; /, torulus. Sutures: v x, mesocranial ; x y, epifrontal, and 

 u y /, paracranial sutures. 



times form piers for the support of the lateral appendages of 

 the mouth. A cotyloid cavity exists on either side of the 



