140 



Kafer der Mark Brandenburg, by Erichson, vol. 1. 

 page 142. The genus Hydaticus, has very pro- 

 perly been divided into three sections. 



Sp. 25. Griseus. — Type of the genus Eunectes of 

 Erichson, which has also been named Nogrus by 

 Eschscholtz. 



Sp. 26. 10-punctatus. — Still a Colymbetes. I have 

 lately received five other species from New Holland, 

 which will appear in my forthcoming Fauna Aus- 

 tralasiae. 



Sp. 29. Bipustulatus. — Now the type of my genus 

 Necticus, from vtjktlkos natabilis qui natare potest. 

 I have here been compelled to change Erichson*s 

 generic name, as I consider Striatus the true type 

 of Colymbetes, and Serricornis that of Agabus of 

 Leach. As both these terms are previously used, 

 it may prevent further confusion by adopting ano- 

 ther name. It appears also that the Baron Do 

 Jean and Erichson apply their respective generic 

 names to the same species. It may here be added, 

 that Necticus still requires further sub-division — till 

 we are better acquainted, however, with the sexes 

 of several of them, the above name is attached to 

 those species which arc allied to Dyt, 2-pustulatus 

 Lin. and Dyt. Carbonarius Fab. 



Sp. 30. Cinctus. — I give this as a Colymbetes, 



