472 CLAUDE FULLER. 



oval mounds which lie lateral to the caudal apex of a raised 

 median area of the frontal area). Median area of depression 

 generally more or less elevated ; elevation more or less trian- 

 gular with its apex a little anterior to the fontanelle and its 

 base demarcating the caudal extremity of the clypeus ; at the 

 base of the triangle, and between the superior articulations 

 of the mandible, there are several transverse Avrinkles which 

 represent the obsolete clypeo-frontal suture (triangular 

 median area often suppressed). Frontal carina black, 

 chitinous, widely diverging, crenulate ; forming the lateral 

 margins of paired, well-defined, diverging ridges ; these 

 ridges originate at the superior articulation of the mandibles 

 where they ai'e narrow, mediad of the antennal fossse they 

 widen and laterad of the fontanelle merge into the vertex ; 

 median slopes of ridges falling more or less abruptly into 

 frontal g\*ooves. 



Bye-spots inconspicuous, pale. Ocelli absent. 



Clypeus oblong, wider than long, slightly arched, sides 

 straight and parallel ; cephalic margin with a thin plate (the 

 epistome) ; faintly curvate or straight Avith slightly oblique, 

 cephalo-lateral corners. 



Labrum elongate, tapering, slightly arched ; sides curvate ; 

 distal margin of chitinised region more or less incurvate, 

 bearing a white cordate epipharyngeal lingula. 



Mandibles black, strong, forcipiform, more or less simple, 

 incurved ; apices upbent. Left mandible stouter than right ; 

 distal half of cutting margin finely wavy ; proximal half pro- 

 duced into a series of irregular processes, one of which is 

 particularly prominent and like the blade of a small scalpel. 

 Right mandible with cutting margin entire ; base faintly 

 wavy with two insignificant sub-conical protuberances. 



Antennae XVII-jointed, dark bi*own-red, ringed. Joint I 

 always the longest, II nearly always the shortest, III always 

 the second longest joint, V always narrower and shorter 

 than IV and VI, generally longer than II. VI-XVI sub- 

 equal, or gradually increasing in length from VI to X and 

 decreasing from XII-XVI ; XVII always slightly longer and 



