(1) For the 19 species 1 the habitats of which are marked thus t, 



consider that more conclusive evidence is required before i 

 can be looked upon as absolutely certain that they were really 

 captured in the island-Groups thus indicated. 



(2) The species in italics have not, so far as I am aware, been ob- 



served hitherto except in these Atlantic islands ; though we 

 may be quite sure that a proportion of them will be detected 

 in Mediterranean latitudes whilst it is also possible that 

 certain others may be but modifications of species (which 

 have usually indicated within brackets) already known 2 . 



(3) Those, however, which I should regard as wZtfra-indigenous (and 



which, therefore, are not likely ever to be found except in 

 this Atlantic province), I have noted by prefixing to them an 

 asterisk (*) ; and they must consequently be looked upon as 

 emphatically " endemic." 



1 Siagona europeea, Dytiscus circumflexus, Gyrinus natator, Berosus spinosus, 

 Cholovocera Maderce, Attagenus pellio, Chasmatopterus nigrocinctus, Laparocerus 

 morio, Hesperophanes roridus, Clytus Webbii, Crioceris asparagi, Gastrophysa 

 polygoni, Cassida nebulosa, Coccinella 14-pustulafa, Tentyria interrupta, Pimelia 

 fornicata, Tenebrio molitor, Helops Marseulii, and Iscknomera melanura. 



2 Although I have thought it desirable to indicate certain species within 

 brackets (prefixing to them an < *), which I feel it far from impossible may be 

 the central types from which their Atlantic representatives have radiated, I wish 

 particularly to state that I do not myself believe (at any rate in the majority of 

 cases) that the latter are undoubted modifications of the former ; for had I done 

 so, I should simply have recorded them as mere varieties. But, as I know that 

 there are many naturalists who would hold an opposite opinion, and since I con- 

 sider it a decided advantage (as an aid to the eye) to express (when practicable), 

 even on a tabular list, the exact affinities of species by pointing out their nearest 

 known allies, I have adopted this latter course, leaving future collectors to 

 judge for themselves (by observation in situ) whether they should regard those 

 particular forms as truly specific ones, or not. 



