220 Mr. T. Vernon Wollaston on 
Fam. DYTISCIDA. 
p- 67 (genus CoLYMBETES). 
The Atlantic species of this group fall more properly 
under Hschcholtz’s genus Seutopterus, which I have 
hitherto regarded as scarcely more than a subdivision of 
Colymbetes proper. As, however, it appears to be usually 
acknowledged, and the only exponents of it which have 
yet been brought to light are the coriaceus and lanio (the 
former of which is found in the south of Europe and the 
Canaries, whilst the latter is supposed to be peculiar to 
Madeira), and the pustulatus from Italy, it will be better 
perhaps to uphold it as generically distinct, and to cite 
the species consequently as Scutopteri. They seem to 
differ from the true Colymbetes in having the first four 
joints of their four anterior male feet powerfully dilated, 
the basal three being likewise studded beneath with 
minute cushions or pulvilli. Although I have not yet 
seen that particular sex of the species which I have 
enunciated below under the title of imbricatus, it never- 
theless has so very much in common both with the 
coriaceus and lanio that I have little doubt it must be a 
true member of the same actual group. Of the three 
Atlantic Scutopteri, it will be desirable to place the coria- 
ceus first, then the imbricatus (a diagnosis of which I 
subjoin below), and lastly the lanio. 
Scutopterus inbricatus, n, sp. 
S. oblongo-ovatus, elongatus, subopacus, nigro-piceus, 
capitis parte antica maculisque duabus frontalibus et pro- 
thoracis lateribus piceo-ferrugineis ; capite prothoraceque 
rugose coriaceis, hoc antice angustato; elytris elongato- 
ovatis basi truncatis, paululum nitidioribus, grosse sub- 
imbricato-rugulosis et obsolete subtestaceo commixtis, 
singulis longitudinaliter triseriatim notatis; antennis 
palpisque rufo-ferrugineis, pedibus rufo-piceis. 
Long. corp. lin. 10. 
Hab.—Maderensis (Mad.); exemplar unicum, sc. feemi- 
neum, olim misit clariss. Baronus de Paiva. 
Obs. Species S. lanioni affinis, sed corpore magis 
ovato (antice, et in elytris et in prothorace, angustiore), 
elytris obscurioribus, minus nitidis, et rugose imbricato- 
