Diaptoiims pallidas Herrick. 



Fig. 



1. Lateral view of preimago (immature) female. 



2. Right antenna of male. 



3. Fifth feet of the male as they usually appear. 



4. Fifth feet of the female. From Minneapolis specimens. 



5. Feet of fourth pair. 



6. Fifth feet of the male, showing the true nature of the appendages 



of the left foot. The inner ramus of the left foot is not shown 

 in the figure. 



Diaptomus oregronensis Lilljeborg. 



7. Right antenna of the male. 



8. Fifth feet of the male. 



9. Fifth foot of the female. 



10. Palpus of the mandible. 



11. Left foot of the fifth pair according to Lilljeborg. 



12. End of the female antenna. 



All but Fig. 11 from specimens from Lake Minnetonka, near Min- 

 neapolis, Minnesota. 



