460 The University Science Bulletin. 



PLATE XLVII. 



Fig. 1. Ventral view of male genital capsule of Nepa apiculata Uhler. 

 J'rom North America. 



Fig. 2. Lateral view of clasper of above. Compare with figure 4 of N. 

 cinerea L. of Europe. 



Fig. 3. Ventral view of male genital capsule of Ncpa cinerea L. 



Fig. 4. Clasper, lateral view of Nepa cinerea L. 



Fig. 5. Antenna of Nepa apiculata Uhler. From New York. 



Fig. 6. Antenna of Nepa cinerea L. From Europe. U, ultimate antennal 

 segment. P, penultimate antennal segment. L, lateral prolongation of penulti- 

 mate segment. The splendid antennal and genital characters separating these 

 two species of Nepa illustrate the taxonopic value of these hitherto unused 

 structures in the Nepidse. In the drawings which follow, do not attach sig- 

 nificance to the basal segment, but to the last two segments. 



Fig. 7. Antenna of Curicta drakei, sp. new. 



Fig. 8. Antenna of Curicta howardii Montd. 



Figs. 9 .and U. Antennse of Rnnatra kirkaldyi Bueno. Sometimes the ulti- 

 mate segment is fused with the preceding segment and sometimes entirely 

 separate. 



Fig. 10. Antenna of Ranatra nigra H. S. (^R. protensa Montd.). 



Fig. 12. Antenna of Ranatra buenoi, sp. new. 



Fig. 13. Antenna of Ranatra drakei, sp. new. 



Fig. 14. Antenna of Ranatra brevicollis Montd. 



Fig. 15. Antenna of Ranatra australis, sp. new. 



Fig. 16. Antenna of Ranatra quadridentata Stal. 



Fig. 17. Antenna of Ranatra fiisca P. B. (=J?. americana Montd.). 



