2U 



Bulletin No. 159 



Fig. 8.- 



Mouth-parts and other structures" of the larva of S. p^ctt/^es. a, dorsal view of 

 head; d, stalk of vibratile bristles: c, ventral view of head; e, palpus of maxilla 

 greatly magnified; J, antanna; g, mandible; //, tip of mandible greatly magnified- 

 /, labium; 7, tip of loot; k, ring of spinules at hind end of body; m, side view ex-' 

 tremity of'abdomen showing protrusibie respiratory appendages. 



