PLATE XV. 



Figs. 1-10, 16. Leuckartia fiavicornis, Claus. 



Fig. 1. Female, seen from left side, magnified 16 diameters. 



Fig. 2. Left anterior antenna of male. 



Fig. 3. Terminal joints of the same, more highly magnified. 



Fief. 4. Posterior antenna. 



Fig. 5. Mandible and palp. 



Fig. 6. One of the swimming feet. 



Fig. 7. Terminal spines of the same, more highly magnified. 



Fig. 8. Right fifth foot of male. 



Fig. 9. Left fifth foot of male. 



Fig. 10. Abdomen of male. 



Fig. 16. Maxilla. 



Figs. 11-15. Undina vulgaris, Dana. 



Fig. 11. Anterior antenna of male. 



Fie;. 12. Anterior antenna of female. 



Fig. 13. Foot of second pair. 



Fig. 1 4. Fifth pair of feet of male 



Fig. 15. Abdomen of male. 



