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10. Sperciieus, Fabricius. 



M. M. Audouin and Brullc place this genus 

 along with the Helophovida3. I am, however, still 

 inclined to rank it with the Hydrophilidai ; and of 

 this opinion Mr. MacLeay appears to be, as well 

 as Mr. Stephens. By the former writer a second 

 species, named Sp. platycephalus, is described from 

 Java, it seems however to deviate from the type ; 

 a third has fallen under my inspection from Sierra 

 Leone. Since writing the above, Mr. Westwood, 

 I find, considers this genus as the connecting link 

 between the Hydrophilida^ and HelophoridaB, Vid. 

 part 3, page 122, of the Introduction to the Modern 

 Classification of Insects, for further observations 

 on these singularly formed aquatics. 



11. LiMNEBius, Leach. 



This genus was established by Dr. Leach to in- 

 clude several minute Hydrophilidae ; they approach 

 in form and habits some of the Hydrobii as well 

 as the Helophorida). There are nine species re- 

 corded by Mr. Stephens in his Illustrations of 

 British EntomoWv. 



