522 TERTIAltY INSECTS OF NORTH AMERICA. 



ing species, agreeing with it also in size, which none of the other fossils do ; 

 but in other particulars, including the intimate texture of the surface, it 

 agrees better with its contemporaries. It is nearest perhaps" to P. halli, but 

 the stria 1 and punctures are a little less pronounced, the insect is much 

 larger, and the fifth and sixth stria? meet at no great distance from the tip 

 of the elytron, as in the modern species mentioned. There appear to be 

 three punctures in the third interspace. 



Length of elytron, 5'"; breadth, 2 mi ". 



Clay beds of interglacial times, Scarboro, Ontario. Six specimens, 

 Nos. 14477, 14478, 14486, 14516, 14526, 14538 (G. J. Hinde). 



PLATYNUS HARTTII. 

 Pi. 1. Fig. 31. 



This species, represented by a couple of specimens only, is the smallest 

 of those found in the interglacial deposits, and in its peculiarities, especially 

 in the distant union of the fifth and sixtli stria>, is most nearly allied to 

 the largest. Its outer margin is well rounded, scarcely marginate, the 

 humeral angle tolerably prominent but well rounded; the striae are coarse 

 and deep, with rather heavy but not very distinct punctures, scarcely broad- 

 ening the stria', while the piceous surface is delicately and rather faintly 

 cross-ribbed. The marginal stria is obsolescent. There are apparently two 

 or three interspacial punctures. It is very small for a Platynus. 



Length of elytron, 3.6 mm ; width of one, 1.35 mm . 



Interglacial clays of Scarboro, Ontario. Two specimens, Nos. 14475, 

 14480 (G. J. Hinde). 



Named in memory of my fellow-student, Prof. C. F. Hartt, formerly 

 director of the Geological Survey of Brazil. 



PLATYNUS C/ESUS. 

 PI. 7, Fig. 34. 



This species is represented by a couple of specimens, one showing the 

 closed elytra, the other the whole body proper and the fragment of a leg. 

 It appears to be a true Platynus. The head is obscure, but apparently 

 longer than broad, with medium-sized circular eyes. The pronotum is 

 broad sublyriform, the front margin scarcely concave, the anterior angles a 



