78 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



near the base, where the puncta are large and round, and not as shown 

 in the figure, resembling closely the modern species named, as does the 

 sutural stria ; the other strise differ, however, in being very obscurely 

 punctate and the elytron is smaller and of a deader black. The length 

 of the fragment is 4"", and the breadth 1-6"" The probable length of 

 the elytron was 4"°', the portion broken at the tip being hardly more 

 than the basal portion before the striation. 



One specimen : No. 16804, Scarborough. 



H. vulpeculus occurs in Canada, New England, Pennsylvania and 

 Missouri. 



Dttiscid^. 



Coelambus derelictus sp. nov. 



PI. IX., Fig. 4. 



The complete elytra of this species show a dense punctuation, a sharply 

 defined sutural stria, a very delicately marginate outer border, and indi- 

 cate a small and rather slender scutellum. It agrees fairly well with 

 C. disaimilis Harr., but it is a little larger, and the punctuation is scarcely 

 so delicate. Length S"""- 



Two specimens : Nos. 16900, 16901, Scarborough. 



C. dissimilis occurs at Lake Superior and in Massachusetts, New York 

 and Illinois. 



Coelambus cribrarius sp. nov. 

 PI. IX, Fig. 3. 



A single specimen, a nearly perfect right elytron, appears to come very 

 close to C. impressopunctatus Sch., and is of much the same size and form. 

 It is densely, conspicuously and finely punctate pretty uniformly over the 

 whole elytron, but the punctuation is a little finer and denser than in the 

 modern species, and there is no sign of a sutural stria or of the mid-elytral 

 basal strise. Length S-S"". 



One specimen : No. 16909, Logan's brickyard, Toronto. 



C impressopunctatus is found in Alaska, the Hudson Bay Territories 

 and Lake Superior, as well as in Massachusetts, New York, New Jersey, 

 Pennsylvania, Michigan and Illinois. 



Coelambus infernalis sp. nov. 



PI. IX, Fig. 2. 



Another species is represented by an elytron, from which much of the 

 tip is broken. It also resembles, so far as punctuation is concerned, the 



