u8 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- 



(SEses^ 



F,G 22 -The Integumental Skeleton of thellead a{^x.V.^xss\g(Fo,fiadaaurHuhr,ay. 

 fi.teral aspect; -^ interior of one lateral half; j, anterior, an<W, posterior 

 aLect : «, antenna ; ./, epistome ; cp c, epicephalon ; /, frons ;/«, face ; A para- 

 cephalon ^, gula ; /, lal,rum ; md, mandible ; ,nx\ maxilla ; ;«.v- labium : o 

 occipital fo--en ; /, toruhis. Sutures: v ., mesocranial ; . y. epifrontal, and 

 uy /, paracranial sutures, 

 times form piers for the support of the lateral appendages of 

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



