143 



details. The type of the g-eiius is Hyd. Haviatilis 

 Leach. 



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

 ville. Erichson reo-ards Noterus sparsus of Marsham 

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

 therefore, is changed to Europe. 



Sp. J'i. 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 7^- 



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. inajqualis, Fab. 



Gyrinid^, Leach. 

 Gyronecha, Kirhy. 

 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 



