92 THE CANADIAN ENTOMOLOGIST. 



Body glossy, black underneath, above blue-black. Head a little 

 bronzecf ; nose transversely impressed, wrinkled ; frontal impressions large 

 and deep : prothorax with a deep anterior transverse impression, reaching 

 nearly from side to side, in the centre of which is also a deep punctiform 

 impression, and behind it on each side two others, but wrinkled and 

 more shallow ; on each side also is a large gibbosity or boss : elytra 

 nearly oblong, with eleven rows of shining bronzed punctures ; at their 

 apex the punctures are scattered, the margins also are bronzed ; epipleura 

 black ; the tip of the elytra is very obtuse and almost truncated : legs 

 rufous. This species is very near G. marimis, but it is much larger, 

 and is sufficiently distinguished from it by the deep furrow or channel 

 that runs quite across the prothorax, its more prominent bosses, and its 

 impressions. In G. i/iarinus, also, the punctures at the tip of the elytra 

 are not scattered, but mark out a crescent-shaped area ; and the apex 

 itself is not so obtuse. [Referred to G. borealis Aub£, by White. 

 (Brit. Museum Cat. 45), but probably incorrectly.] 



[80.] 115. Gyrinus /eneus Leach. — Length of body 25 lines. 

 Taken in Canada by Dr. Bigsby. Very like the preceding species, but 

 much smaller, the transverse impression of the nose and the frontal 

 impressions are not so deep ; that of the prothorax is not so conspicuous, 

 and there are no lateral bosses ; the elytra are much narrower at the apex, 

 where, as in G. Marinus, a crescent is marked out by punctures. 



116. Gyrinus ventralis Kirby. — Length of bocW 2 3- 3 lines. Two 

 specimens taken in Lat. 54 . 



Nearly related to G. ae/icus, but the whole prone surface of the body, 

 the epipleura of the elytra, and the legs, are ferruginous ; in which par- 

 ticulars it resembles G. lineatus ; it is, however, much smaller than that 

 species, the punctures in the rows are more conspicuous, and the elytra 

 have no bronzed stripes. [ kk A beautiful species, easily known by its 

 larger size and more brilliant iridescent surface ; in one specimen the 

 under surface is nearly black." — LeConte, loc. cit. p. 368. Taken in 

 Canada by Mr. Pettit at Grimsby, Ont. ; also on north shore of Lake 

 Superior by Agassiz's Expedition. New York to L. Superior (LeConte).] 



[81.] 117. Gyrinus analis Kirby. — Length of body 3 lines. One 

 specimen taken in Lat. 54^. 



Near the preceding, but larger, punctures of the rows larger : breast 

 bones black ; mouth, sides of the forebreast, anus, and legs, rufous ; the 



