life-history of Pericoma canescens (Psycliodidse). 153 
Explanation of Plates III. and lY. 
Pericoma canescens. 
PLATE III. 
Fig. 1. Larva, dorsal view, as., anterior spiracle, X 20. 
2. Larva, ventral view, X 20. 
3. Pupa, ventral view, X 20. 
PLATE IV. 
Fig. 4. Anterior annulus of abdominal segment of larva, dorsal 
view, X 75. 
5. Last abdominal segment, with one pair of fringed anal 
processes, dorsal view, X 50. 
6. Last abdominal segment, end view, showing two pairs of 
anal processes, X 50. 
7. Last abdominal segment, end view, showing posterior 
spiracles, X 100. 
8. Head, underside, showing Z&r., labrum ; at., antenna ; mn., 
mandible ; mx.^ maxilla ; oc, eye-spot ; sd.^ salivary- 
duct ; sm., submentum, X 150. 
9. Extremity of mandible, X 300. 
