CANADIAN FOSSIL INSECTS. 



39 



the median line (separating the two lateral halves of the whole metaster- 

 num) is very deeply impressed, but the furrow dies out anteriorly in the 

 projection between the ooxse. 



Length of metasternum, 2'1""" 



Cryptohypnus planatus occurs in Canada and the northern United 

 States. 



Fornax Laporte. 

 Fornax ledeusis. 



PL III, figs. 3 and 4. 



A single elytron is preserved in a nodule, which contains also the 

 remains of a fish (Mallotus mllosus, according to Sir William Dawson). A 

 portion of the black chitine still remains at the base and tip, and the form 

 of the whole and the sculpturing of the surface are perfectly preserved. 

 It is most nearly allied to F. calceatus (Say), but differs from it too much 

 to be placed with it. The narrowing of the elytra is scarcely perceptible 

 before the distal fourth, where it is distinct and rapid, the apical angle 

 slightly less than a right angle. It is very distinctly striate, considerably 

 more so than in F. caloeatus, the interspaces between the striae more den- 

 sely punctured even than in that species, though not so deeply, producing 

 a very rugulose appearance ; the punctuation appears to be disposed to a 

 noticeable extent in slightly oblique transverse rows, as is also the case in 

 F. calceatus, and in which there are about four or five punctures across an 

 interspace ; in each puncture is a circular pit, the point of insertion of a 

 hair (not preserved), which is only O'Ol™™ in diameter, while the punc- 

 tures are nearly 0-04™™ in diameter ; the striae in the broadest part of 

 the elytron are 0'2"" apart, the width of the elytron l-T"", and its 

 length 5-5"""- 



The species differs from F. calceatus in the slightly more rapid and 

 apical attenuation of the elytra, the stronger striation, shallower but more 

 dense punctuation, and the smaller hair pits ; from F. hornii in its darker 

 colour, the stronger striation, shallower, denser and more rugulose punc- 

 tuation ; and from F. hadius in the broader and more suddenly narrowed 

 elytra, more distinct striation, and much more distinct punctuation. 



Fornax calceatus is found in Canada, about Lake Superior, and in 

 Massachusetts. 



Post-pliocene (Leda clays) of Green's Creek, Ottawa, Canada — Sir 

 William Dawson. 



