147 



tion by Dr. Richardson, in latitude 65°. I have 

 received it from Algiers, and have it noted down 

 in my Journal as occurring also in Egypt. 



Sp. 12. Strigosus. — Probably a Gyrinus. The 

 Baron De Jean, in his Catalogue of 1 837, gives 

 this species as a variety of G. Striatus Fab. The 

 locality of the latter is Europe, of the former New 

 Holland ; there is, therefore, evidently some error. 



Sp. 14. Villosus. — Now a Potamobius of Leach. 

 Most of the Gyrini, when recently captured, emit 

 a very disagreeable odour ; this species is scentless ; 

 it moreover differs from all others in being a soli- 

 tary insect, while the rest are social or gregarious. 

 It is reported to be a nocturnal insect, which may 

 probably account for its comparative scarceness. 



Remarks. 



Linneus only mentions two species of the family, 

 Fabricius fourteen, De Jean sixty-seven, in my 

 own cabinet there are twenty nondescripts ; the 

 number, therefore, in the different European col- 

 lections, may be reckoned at about one hundred 

 species, and this will eventually be considerably 

 increased as we become acquainted with the extra 

 European species, which at present are in proper- 

 ly 2 



