38 



MIOCENE FAUNA. 



agree with American forms in their longer and narrower elytra. 

 Two of them (e.g. Hydrophilus giganteus, Heer, fig. 271) are actual 



Fig. 272. Fig. 275. 



Fig. 271. 



Fig. 273. Fig. 274. 



Fig. 282. Fig. 280. Fig. 281. 



Fig. 277. Fig. 276, 



Fig. 271. Hydrophilus giganteus, Heer (restored). 



Fig. 272. Hydrous Escheri, Heer. 



Fig. 273. Escheria bella, Heer. 



Fig. 274. Hydrophilopsis elongata, Heer. 



Fig. 275. Silpha tricostata, Heer. 



Fig. 276. Hister Mastodontis, Heer. 



Fig. 277. Troyosita sculpturata, Heer. 



Fig. 278. Bledius speciosus, Heer. 



Fig. 279. Dytiscus Lavateri, Heer. a, elytron of the female j b, 



elytron of the male. 

 Fig. 280. Cybister Agassizi, Heer. 



Fig. 281. Dineutus longiventris, Heer. 



Fig. 282. Hydroporus antiqum, Heer, three times nat. size. 



giants among insects ; and in size even the tropics do not now 

 possess any insect species equal to them. As two large Hydro- 

 phili (H. Gaudini and H. Ruminianus, Heer) have been discovered 

 at Monod, these animals must have occupied a prominent place 

 in the fresh waters of the Swiss Miocene country. The existing 



