143 



details. The type of the genus is Hyd, flaviatilis 

 Leach. 



Sp. 72. Semipunctatus. — Now a Noterus of Clair- 

 ville. Erichson regards Noterus sparsus of Marsham 

 as the same insect ; the locality of the East Indies, 

 therefore, is changed to Europe. 



Sp. 74. Arcuatus. — This species is only a variety 

 of Hygrotus pictus. 



Sp. 79. Pygmceus. — According to Erichson this 

 insect is only a variety of Hyd. lineatus. Vid 

 Kafer Brand, page J 9. 



Sp. 85. Pusillus. — This insect is evidently only a 

 variety of Hydroporus geminus. 



Sp. 86. Parvulus. — Now an Hygrotus of Stephens, 

 which, according to Erichson, is only a variety of 

 Dyt. insequalis, Fab. 



Gyrinid^e, Leach. 

 Gyronecha, Kirby. 

 Gyrinoidea, Hope. 



Most Entomologists consider that Gyrinus is 

 closely allied to Dyticus, and yet it is difficult satis- 

 factorily to point out the connecting link between 

 them. Mr. W. Sharpe MacLeay, in his Annulosa 

 Javanica, without attempting to sub-divide the 

 Hydradephaga into its several families, gives us 



