On the larva of Pelophila. 135 
(pH ¢ 
DESCRIPTION OF FIGURES. 
1. Young larva (four days old) of Pelophila borealis (Payk.) 
2. Hinder end of young larva, showing cerci. 3. Full-grown larva 
of Pelophila borealis. 4. Head from above, with mandibles. 
5. Head from beneath, with antenne, maxilla, and labium. 6. Ocelli, 
from side. 7. Terminal segments of antenna. 8. End of maxilla. 
9. Terminal abdominal segments, from beneath. 10. Terminal 
abdominal segments, anal tube, and cercus from side. 11. Leg of 
the first pair. 12. End of tarsus and claws. 
