526 TERTIARY INSECTS OF NORTH AMERICA. 



PTEROSTICHUS DORMITANS. 



PI. 1, Figs. 49, 55. 



This species, represented by two opposite ends of elytra, is very close 

 indeed in size and general character to P. laetulus LeC. It may be slightly 

 smaller, but not enough to be worth specifying. The color is different, 

 being testaceous instead of a dull metallic green. There are the same 

 delicately traced, indistinctly, distantly, and delicately punctate striae. ; a 

 sutural stria of the same character, and similarly flattened interspaces. The 

 intimate surface structure of the interspaces is similar, but the cells of the 

 present species are a little smaller than in P. laetulus, with coarser and less 

 prominent walls, and therefore giving a much less delicate reticulation. 

 The third interspace is not well enough preserved to tell anything about 

 the punctures. 



Length of largest fragment, 4.5 mm ; breadth of elytron, 2 n " n . 



Interglacial clays of Scarboro, Ontario. Two specimens, Nos. 14503, 

 14508 (G. J. Hinde). 



PTEROSTICHUS DESTITUTUS. 

 PI. ], Fig. 44. 



This species is represented by a single elytron of a mahogany color, 

 which seems to be nearly related to P. sayi Brulle and of the same shape, 

 though a considerably smaller species. The character of the stria?, in depth 

 and punctuation is quite as in 1*. sayi, but the interspaces are flatter, and 

 the delicate transverse reticulate striation, finely traced in P. sayi, is here 

 inconspicuous and dull and more irregular. The present species has a 

 similar sutural stria, but apparently no puncta in the third or any other 

 interspace, though it is possible that one exists in the place occupied by the 

 posterior one in P. sayi. One peculiarity of the present species is the early 

 union of the fifth and sixth striae, well in advance of the interruption of the 

 marginal curve. 



Length of elytron, 6"' m ; breadth, 2.5 mm . 



Interglacial clay beds of Scarboro, Ontario. One specimen, No. 

 14522, (G. J. Hinde). 



