50 CONTRIBUTIONS TO CANADIAN PAL.EONTOLOOY. 



Ptkrostichus Bonelli. 

 Table of the Interylacial species of PterosficJius. 



Sutural stria uniting with tlie first near the base. 



Cell inclosed by sutural and first stria> not twice as long as 

 the width of interspace between first and second strijv ; 



stria^ without punctures ahro</at}is. 



Cell inclosed by sutural and first stria' fully three times as 

 long as width of interspace between first and second 

 strife. 

 Stria^ punctate. 



Strife heavily punctate. 



Fifth and sixth stri;e united in the apical sixth of the 



elytra dormitans. 



Fifth and sixth strijv united near the middle of the distal 



half of the elytra destitutus. 



Strite faintly punctate fractus. 



Strife impunctate destructus. 



Sutural stria independent of the first gelidus. 



Pterostichus abrogatus. 



Pferostirhtis ahrogafus Scudd., Tert. Ins. N.A., 525, PL i, fig. 39 (1890). 



A fragment of an elytron indicates a species closely allied to P. hercu- 

 laneus Mann, in elytral structure and of probably about the same size. 

 The sutural stria is similar ; there are the same broad and deep, simple 

 stria?, only they are, if anything, broader and deeper in the fossil. The 

 interspaces are, however, flatter than in the recent species, and the inti- 

 mate texture of the surface, instead of showing a very distinct reticulation 

 of minute imbricated cells with sharply defined walls, is almost entirely 

 smooth, the faintest sign only of such ti-acery being visible with strong 

 magnification. The first stria is also at an unusual distance, from the 

 margin. The colour is jDiceous. 



Length of fragment, 5'""' ; width of same, 2™'" ; presumed length of 

 elytron, 7-5""". t 



Pterostichus herculaneus is found in Alaska and Vancouver Island. 



Interglacial clays of Scarboro', Ont. One specimen, No. 14560 — G. J. 

 Hinde. 



Pterostichus dormitans. 



Pterostichus dormitans Scudd., Tert. Ins. N.A., 526, PI. i., figs. 49, 55 (1890.) 



This species is mentioned here only to cori^ect an error in my Tertiary 

 Insects, Avhere it was credited to Scarboro', Ontario, on the shores of Lake 



