OF AQUATIC COLEOPTERA. 15 
16. — glacialis Villa, var. Portugal. 
145 — griseus Herbst. Carregado, Coimbra. 
18. Hydræna gracilis Germ. Monchique. 
19. Octhebius corrugatus Rosenh. Portimao. Six individuals 
of a remarkable little Oc{hebius found by M. van Volxem at this 
locality agree well with Rosenhauer”’s description, except that they 
have the elytra of a testaceous colour, while Rosenhauer says in 
corrugatus the elytra are dark brassy. 
20. Octhebius Volxemii n. sp. Oblonqus, niger, parcius bre- 
vilerque albido-pubescens, supra capile thoraceque aureo-æneis, 
elytris œneis; capile nitido, sublævi, vertice bifoveolato ; protho- 
race transverso, poslerius angustato, sed lateribus membrana 
pellucida auctis, nitido, fere impunctalo, medio canaliculalo, 
foveis subobsoletis notato ; elytris dense, obsolele, irrequlariterque 
punclalis; antennis, palpis, pedibusque testaceis. Long. 2 mm. 
This species is allied to O0. æratus Steph., but differs therefrom in 
colour, and in the sculpture of the elytra, for these, instead of bea- 
ring a few rows of fine obsolete punctures, are covered with 
densely placed, indistinct punctures, which are not arranged in 
distinct series. In other respects the two species are very similar. 
Portimao and Lagos. 
21. Cyclonotum hispanicum Küst. Madrid, Villa real, 
Coimbra. 
BR: — orbiculare Fabr. Portugal. 
23. Sphæridium scarabæoides Lin. Caldas. 
24. CGercyon obsoletum Gyll. Mafra. 
R9. — melanocephalum Lin. Santa Olalla. 
