458 The University Science Bulletin. 



PLATE XLVI. 



Figs. 1 and 2. Clasper and male genital capsule of Ranatra buenol, sp. 

 new. Note the reduced subapical tooth of the clasper and the spatulate form 

 of the tip. 



Figs. 3 and 4. Ranatra australis, sp. new. Note the truncate subapical 

 tooth of the clasper and its distance from the apical one. 



Figs. 5 and 6. Ranatiia kirkaldyi Bueno. S, subapical tooth. C, clasper. 

 I, intromittent organ. This species is clearly quite distinct in its relationship 

 from the others. Note the shape of the intromittent organ and of the clasper. 



Figs. 7 and 8. Ranatra quadridentata Stal. I am not able to find any 

 constant differences between this and R. jusca P. B. {^R. americana Montd.) 

 in respect to the male genitalia. The male of the latter species has, on the 

 whole, a more slender clasper. 



Figs. 9 and 10. Ranatra brachyura Horv., 1879, said to be same as R. 

 sordidula Dohrn., 1860. From Japan. Confused by a student of this family 

 with R. protensa Montd. and so labeled. Compare figures 9 and 13. 



Figs. 11 and 12. Ranatra drakei, sp. new. 



Figs. 13 and 14. Ranatra nigra H. S. (^R. protensa Montd.). The pre- 

 ceding species and this one have claspers which are broad in their middle 

 parts, but the shape at the tip distinguishes them. 



Figs. 15 and 16. Ranatra linearis Fab. From Euroj^e. Berlese. in his 

 Gli Insetti, p. 323, figures this species. Note that the difference between the 

 clasper of this species and that of our American species is more apparent than 

 the superficial appearance of the insects when side by side in the cabinet. 



