SOUDDER.] CANADIAN FOSSIL INSECTS. 47 



PLatynus hindei. 



Platynus hindei Soudd., Tert. Ins. N. A., 520, PI. i, fig. 54 (1890). 



A number of fragments occur of a species which seems to be allied to 

 P. rubripes Zimm., but is much smaller than it and differs from it consi- 

 derably. The shape of the elytron is much the same as there, but the 

 humeral angle is more pronounced, the striae are rather coarser and 

 perhaps a little more heavily punctate, while the interspaces, instead of 

 being faintly and shallowly punctate, are not only very faintly and irre- 

 gularly transversely corrugate, but the fine sharp reticulation of the living 

 species seen under strong magnifying power is entirely absent from the 

 piceous surface of the fossil, being replaced by a scarcely perceptible dull 

 transverse ribbing. The fifth and sixth strise are also united only a little 

 beyond the middle of the distal half of the elytron, and the sutural stria 

 is very short indeed and generally inconspicuous. 



Length, 4-6.5""^; breadth, l-S""". 



Platynus rubripes is found in New Hampshire, Massachusetts and 

 Virginia. 



Clay beds of interglacial deposits, Scarboro', Ontario. Nine specimens, 

 Nos. 14512, 14514, 14518, 14528, 14533, 14544, 14546, 14554, 14562— 

 O. J. Hinde. 



I take pleasure in dedicating this species to Dr. G. J. Hinde, to whose 

 industry and zeal we are indebted for the interesting series of interglacial 

 Coleoptera here described. 



Platynus halli. 



Platynus halli SonDD., Tert. Ins. N. A., 520-521, PI. i, fig. 41 (1890). 



Another species of Platynus, allied to P. crenistriatus LeC, is still more 

 nearly related to P. hindei just described, and is of the same size, and 

 therefore considerably smaller than the living species, to which it bears 

 the nearest resemblance. Its relations to P. hindei are very much the 

 same as those of P. rubripes to P. crenistriatus, the strise being deeper 

 and coarser than in P. hindei and the punctures larger and heavier. 

 Though the humeral angle is scarcely so prominent as in P. hindei, the 

 texture of the surface is scarcely different, unless in being slightly more 

 marked, while in P. crenistriatus there is no reticulation or cross-ribbing 

 whatever. The early union of the fifth and sixth strise again marks its 

 affinity with P. hindei, and the sutural stria is of much the same character, 

 though slightly variable. 



Length, 4-65"""; breadth, 1-5""". 



Platynus crenistriatus is found in Illinois, Louisiana and Missouri. 



