asymmetrically incised; a transverse row of 4 indistinct dots in the middle 

 of the sclerite. Gula short, broadly triangular. Eyes displaced to near 

 the anterior margin, situated on a light background; setae of head short and 

 dark. In addition to the short primary setae and marginal hairs of the 

 labrum (Figure 512), there are short hairlike chetoids dorsally, near the 

 margin of the lobes and lateral to the white indistinct median sclerite. 

 Mandibles with strongly curved outer margin and almost straight median 

 margin which bears teeth; median margin prolonged into a beak- shaped tooth 

 at the end; upper blade of left mandible with an apical tooth in addition to 

 the terminal tooth; lower blade with a serrated part, an indentation and 

 2 apical teeth; lower blade of right mandible with a serrated part, an 

 indentation and a blunt basal tooth. Submentum trapezoidal; setae near the 

 anterior angles relatively large, longer than the other setae of the 

 maxillolabium. 



FIGURES 511— 513. Philopotamus montanus Don. (after Hickin): 



511 - head and pronotum; 512 — labrum (part); 513 — legs: foreleg, anterior 

 (A), claw of foreleg (B), apex of tarsus and claw of midleg (C). 



375 Pronotum (Figure 51l) and head chestnut brown, without pattern; 



posterior margin of sclerite and posterior half of lateral margin with a 

 broad black border which extends in a narrow stripe to the anterior angle; 

 anterior-margin and anterior -angle seta of sclerite short; medioanal and 

 lateral setae longer than the others. The mesothorax is the largest segment 

 of the body, raised in form of a hump above the pronotum. 



Trochantin of prothorax with a long horn-shaped process. 



Legs of the same length; forelegs brownish, the other two pairs 

 (Figure 513) pale. Tarsi of legs almost as long as the tibiae; ventral side 

 of fore tarsi with a row of short thin spinules (Figure 513, A); mid- and 

 hind tarsi with only distal spinules; claw (Figure 513, B) with a basal process 

 with a seta; a spinelike process basal to this process on the midlegs and 

 hind legs. 



418 



