THE CANADIAN ENTOMOLOGIST. 97 



thorax behind the middle is subparallel, not broadly rounded, as in II 

 herbivaguSj the basal angles nearly right-angles, with only the extreme apex 

 slightly rounded, the sides are feebly depressed, the basal foveae are well 

 defined and with the margin and basal angles strongly and almost confluently 

 punctured, the elytral stria) are deep and the interstices convex, epipleura 

 ferruginous or testaceous. 



Ilarpalus fallax, Leo. Long. -38 inch. 



Oval, black piceous ; legs, mouth, antennae and side margins of prothorax 

 rufo-testaceous. Head and disk of thorax rufo-piceous, the latter at the sides 

 rounded and depressed behind; basal foveae not very deep with a few fine 

 and scattered punctures : elytra in both sexes shining, deeply striate and the 

 interstices quite convex ; epipleura black, never testaceous. This beetle is 

 very closely allied to the two preceding, partaking of the characters of both ; 

 it is larger than pleuriticus, and more robust, but about the size of the 9 her- 

 bivagus; the elytra in both sexes are smooth and shining, the thorax is more 

 rounded at the sides than in pleuriticus but less so than in herbivagus. 



If three series of these beetles be arranged side by side we shall have 



H. pleuriticus, smallest, reddish-brown, convex. 



II. herbivagus, % small, black shining; 9 larger, black, elytra semi-opaque 

 and reticulate. 



H.fallax larger, more convex, elytra in both sexes black, shining. 



The following table will further assist in determining these closely allied 

 species. 



Black piceous, thorax at sides and basal angles strongly rounded, basal 

 foveas shallow, scarcely punctured, elytra % smooth, shining; 9 reticulate, 

 semi-opaque, stria) shallow herbivagus. 



Rufo-piceous, robust, thorax at sides scarcely rounded or depressed, basal 

 foveae sufficiently deep with the angles and side margins strongly punctured; 

 elytra reddish-brown, % 9 shining, striae deeper, epipleura usually testa- 

 ceous jjleuriticus. 



Piceous, more robust, thorax at the sides depressed and with the basal 

 angles more rounded, basal foveae and angles less punctured ; elytra % 9 

 shining, striae deep, interstices quite convex, epipleura black, never testa- 

 ceous. fallax. 



Ilarpalus opacipennis, Hald. Mass. Long. -30 inch. 



Elliptical, black opaque; mouth and antennae testaceous; legs rufo-testa- 

 ceous. Thorax narrowed in front, sides slightly rounded, scarcely depressed, 

 basal angles nearly rectangular, somewhat rounded, basal foveae distinct, 

 linear, impunctured, sometimes rugose. Elytra reticulate and opaque in both 

 sexes, striae fine with a dorsal puncture as in the preceding. Tnis beetle 



