30 (29) Body long, slender, and hemicylindrical; apex of last 



segment rather deeply emarginate, the angles produced 

 and acute (Figs 180, 181) Zaitzevia 

 Body usually less elongate, subtriangular in cross section; 

 apex of last segment shal lowly emarginate, angles less 

 acute 31 



Figs 178-181 Larva of Maorony chus glahratus: 178- dorsal aspect; 

 179- ventral aspect. Larva of Zaitzevia parvula: 180- dorsal 

 aspect; 181- ventral aspect. 



31 (30) Abdominal segments with mid-dorsal humps which are es- 



pecially prominent toward the rear, each hump bearing 

 conspicuous scale-like hairs (Fig. 184); dorsum of 

 each thoracic segment with 2 longitudinal dark spots 

 on each side (Figs 182-184) : Gonielmis 

 Abdominal segments without mid-dorsal humps; thorax with- 

 out dark markings 32 



32 (31) Western; tubercles of dorsum relatively dense, separated 



by less than their own widths, crowded along posterior 

 margins of segments; mesothorax with anterior portion 

 of pleuron much smaller than posterior portion; mature 

 larva 4-5 mm long (Figs 185, 186): Heterlirmius 



Eastern; tubercles of dorsum sparse, separated by more 

 than their own widths except along mid-dorsal line, 

 marginal tubercles separated by their own widths; 

 mesothorax with anterior portion of pleuron subequal 

 to posterior portion; mature larva not over 3 mm 

 long (Figs 187, 188): Oulirmius 



64 



