540 



Labrum (Figure 864, A) narrow, rounded; median depression shallow; 

 dorsal sclerite light brown, covering dorsal surface of labrum completely, 

 with a large, dark dot posteriorly in middle; posterior-angle sclerites 

 short, dark. Seta 1 situated lateral to median depression, in form of a 

 thick, blunt, light spine; seta 4 situated near posterior margin of 

 depression, thinner and slightly longer, light; seta 2 curved, light, larger 

 than 4; seta 3 situated anteriorly on each side, short, light; setae 5 and 6 

 situated on surface, brownish, slightly larger. 



862 



86^ 



FIGURES 862— 864. Sericostoma pedemontaniim McL. (after Nielsen): 



862 - larva, dorsal; 863 - head, dorsaK A) and ventral (B) ; 864- labrum (A), left 

 mandible, dorsal ( BJ, ventral (C) and lateraHD), right palpifer, galea, and maxillary 

 palp(E). 



Mandibles (Figure 864. B. C, D) short, black, massive, spatulate, left 

 mandible slightly larger than right mandible, inner side more deeply 

 concave, transverse ridge near distal margin distinct; teeth blunt, short; 



674 



