170 



Biononiics of Cryi)haliis abietij 



support to the clypeus. At each end of the epistome lies a single- jointed 

 antenna [a.) sunk in a pit. In each pit, externally to the antennae four 

 chitinous bristles are usually placed. These details are more clearly 

 shown in the enlarged view of the epistomal region (Fig. 5). In this 

 figure Ejp. stands for epistome. 



Fig. 5. Region of epistome of C. uhictis larva (greatly magnified). 



Posterior to the epistome and adjacent to it lies a triangular area, 

 the frons {¥.), bounded on each side by the frontal sutures {F.S.). On 

 each side of the frontal sutures lies the epicranium (Ep.), a large area 

 which occupies the greater portion of the surface of the head. The 

 epicranium in turn is divided posteriorly into two parts by the epi- 

 cranial suture (Ep.s.). 



Fig. G. Maxillae and labium of larva of V. ubidis (greatly magnified). 



