SPHISGID^]. 



rounded tumidities. The length of the clypeus is rarely 

 more than half that of the head, and often considerably less 

 than half. The false clypeus (fig. 2 A, d) is a narrow strip 



Fig. 2. 



A. A diagrammatic representation of the larval head, seen from the 



front, a, lobes ; b, true clypeus ; c, basal tumidities ; d, false 

 clypeus ; e, labrum, with lateral bristles ; /, ligula ; g, man- 

 dibles ; i, antenna, with special bristles ; j, eyes. 



B. Ligula and part of labrum of Polyptychtis trilineatus sonanthis, 



seen from the front (greatly magnified), a, ligula ; b, sinus, 

 showing bevelled edge : c. bristles ; d, labrum, lower part ; 

 e, labial bristles. 



