ii8 THE IN TEGUMENTAL SKELETON OE THE IMAGO. 



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

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



Fjg. 22. — The Integuniental Skeleton of the Head o^ ax\Y.Ax\w\g{Fo! fiiida auriculni-Ia): 

 I, lateral aspect; ^, interior of one lateral half; j, anterior, and 4, posterior 

 aspect : a, antenna ; ep, epistome ; ep c, epicephalon ; f, frons ;/a, face ; /, para- 

 cephalon ; g, gula ; /, labrum ; md, mandible ; wjt', maxilla ; titx'-, labium : 0, 

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

 u y t, paracranial sutures. 



times form piers for the support of the lateral appendages of 

 the mouth. A cot}loid cavity exists on either side of the 



