46 CONTRIBUTIONS TO CANADIAN PALiF.ONTOLOrJY. 



Family CARABID^. 



Platynus Bonelli. 



With a single exception, the several species of Platynus here described 

 from the interglacial clay beds belong to one type, somewhat distantly 

 represented to-day by P. crenistriatus LeC, and P. riihripes Zimm., in 

 which the striiv^ are coarse and punctured; the sutural stria insignificant or 

 obsolescent, and the surface texture a very delicate transverse ribbing, 

 nowhere broken up into a reticulation. 



Table of the Interglacial Species of Platynus. 



Elytra with distinctly punctured stride. 



Fifth and sixth elytral strife united near the middle of the a- 

 pical half of the elytra. 



Elytra less than three times as long as Inroad casus. 



Elytra more than three times as long as broad. 



Strife rather delicately punctate. . liuidi'i. 



StrijB heavily punctate halli. 



Fifth and sixth elytral stria? united in the apical sixth of the 

 elytra. 



Strife and strial punctures shfillow clissipatus. 



Stria? and strial punctures deep desuetus. 



Elytra with strial punctures very faint dilapidatus. 



Platynus casus. 



Platynus casus 8cudd., Tert. Ins. N.A., 519-520, PI. i, fig. 42 (1890). 



A single elytron is preserved in the beds which have yielded so many 

 Platyni, which seems to be better comparable with P. rubripes Zimm. than 

 with any other living form, but better still with the fossil forms from the 

 same beds, with which it agrees also better in size, though it is a trifle 

 bi'oader, with a considerably more rounded humeral angle, a more rounded 

 outer margin, and the first stria closely approximated to the suture. 

 Except in these particulars it agrees best with P. /talli ; but, somewhat 

 as in P. rubri2)es though with less regularity in size and distribution, the 

 interspaces are filled with irregular shallow punctures, wdiich run more or 

 less together so as to form interrupted, longitudinal, adventitious sei'ies 

 between the strife. The intimate texture of the surface is much as in 

 P. hcdli, the fifth and sixth strife meet at a distance from the tip and the 

 sutural stria is obsolescent and brief. 



Length, 4-7"""; breadth, l-6"^"\ 



Interglacial clay beds, Scarboro', Ontario. One specimen. No. 14523 — 

 G. J. Hinde. 



