Diaptomus leptopus Forbes. 
Fic. 
1. Lateral view of female. Shaded portions purple. 
2. Dorsal view of the male. To the same scale. 
3. Abdomen of the female from above. 
4. Fifth foot of the female. 
5. Maxilliped. 
6. Antennule. 
7. Fifth foot of the male. 
8. Fourth foot of the female. 
9. Right antenna of the male. 
10. First foot. 
All the figures are from specimens taken near Minneapolis, Minne- 
sota. Mostly camera lucida drawings copied mechanically. 
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