EXPLANATION OF PLATE XLVIII. 
Fic, 35. Pheropsophus agnatus, lateral view, with sac evaginated 
(reversed). 
36. Rhysodes, sp,n.? Australia, lateral view. 
37. Dytiscus punctulatus, end of body with aedeagus pro- 
truded. 
37a. Dytiscus punctulatus, lateral view of median lobe. 
88. Tlybius aenescens, lateral view. 
39. Haliplus fulvus, ventro-lateral view (reversed). 
Descriptions on pp. 491 and 492. Explanation of the letters 
used uniformly on pp. 481-483. 
