PLATE XVIII. 



Figs. 1-5. Scolccithrix minor, u. gen. and sp. 

 Fio\ 1. Female, seen from right side, magnified 55 diameters; a, fifth foot. 

 Fig. 2. Anterior antenna of female. 

 Fig. 3. Maxilla. 



Fig. 4. Anterior foot-jaw of male. 

 Fig. 5. Anterior foot-jaw of female. 



Fig. 6. Undina vulgaris, Dana. 

 Fig. 6. Female, seen from left side, magnified 40 diameters. 



Figs. 7-15. Euchceta prestandrece, Philippi. 



Male. 

 Fig. 7. Male, seen from right side, magnified 16 diameters. 



Fig. 8. Anterior antenna. 



Fig. 9. Mandible. 



Fig. 10. Maxilla. 



Fig. 11. Anterior foot-jaw. 



Fig. 12. Posterior foot-jaw. 



Fig. 13. Fifth pair of feet (adult) ; ", attached spermatophore. 



Fig. 14. The same immature (sutherlandii, Lubbock). 



Fig. 15. Abdomen. 



