5444 Insects, 



2. Fam. Gyrinim, Leach. 

 1. Gyrinus, Geoff. 



G. natator, Linn., Steph. G. substriatus, Steph. Very abundant; 

 ponds and ditches. 



G. bicolor, Payk., Steph. In the Salterns, Island of Portsea; in 

 some abundance. 



PHILHYDRIDA. 



1. Fam. Heterocerid^e, MacLeay. 



1 . Heterocerus, Bosc. 



H. marginatus, Fabr., Steph. H. flexuosus, H. Marshami, H. 

 laevigatus, Steph. Rare ; on muddy banks at Privet. 



2. Fam. Parnid^e. 



1. Parnus, Fabr. 



P. prolifericornis, Fabr., Steph. P. impressus, Steph. Taken in 

 profusion, in September, among weeds in a wet ditch at Privet. 



3. Fam. Elmid^e, Shuck. 

 1. El mis, Latr. 

 E. aeneus, Mull. E. Maugetii, Steph. Rare ; in ditches. 



4. Fam. Helophorid^e, Leach. 



1. Helophorus, Fabr. 



H. aquaticus, Linn., Steph. H. grandis, III. Tolerably common ; 

 pools and ditches. 



H. nubilus, Fabr., Steph. Rather rare ; pools. Occasionally 

 caught flying. 



H. griseus, Herbst. H. tuberculatus, Steph. Very common ; pools. 



2. Ochthebius, Leach. 



O. marinus, Payk. O. dilatatus, Steph. Rare ; Salterns, Island 

 of Portsea. 



O. aeneus, TVaterh. Rare ; ditches at Chark. 



O. aeratus, Steph. O. nanus, O. hibernicus, Steph. Not common; 

 ditches at Grange. 



