530 TERTIARY INSECTS OF NORTH AMERICA. 



PATROBUS Megerle. 

 Patrobus gelatus. 



PI. 1, Fig. 48. 



Of this species tlieonly remains are a single prothoracic shield per- 

 fectly preserved. It is piceous, posteriorly truncate, its angles rectangular 

 and as broad as the length ; in advance of the hinder fourth expanding to 

 nearly one-fourth greater width in the middle of the anterior half, and then 

 again narrowing to the declivous front angles ; the disk convex with a uni- 

 formly and rather deeply incised median line, each lateral half thus divided 

 marked posteriorly by an abrupt flat and punctate depression, with well 

 marked rounded outline, distinctly separated from the median incision on 

 one side or the very narrow, marginate, lateral border on the other, and 

 separated from the latter also by a longitudinal furrow not figured in the 

 plate ; otherwise the surface is smooth. It is undoubtedly related very 

 closely to P. septentrionis Dej., differing principally in the sharp and sud- 

 den depression of the fossae in the hind angles and their separation from 

 the lateral border by a distinct incised longitudinal furrow. 



Length of prothorax, 2.1™" ; greatest breadth, 2.75""°. 



Interglacial clays of Scarboro, Ontario. One specimen, No. 14586 

 (G. J. Hinde). 



BEMBIDIUM Latreille. 



Bembidium exoletum. 



PL 5, Figs. 121, 122. 

 Bembidium exoletum Scudil., Bull. U. S. Geol. Geogr. Snrv. Terr., II, 77-78 (1876). 



A single, rather well preserved "specimen, exhibiting the upper surface 

 and impressions of parts of the legs. It is of about the size of B. in.'pquale 

 (Say). The head is too poorly preserved to present any characters; the 

 pronotum is of equal width anteriorly and posteriorly, its sides regularly 

 and considerably convex, the posterior angles well defined, the hind margin 

 slightly convex ; its surface appears to be veiy faintly punctulate, at least 

 posteriorly, and there is a slightly impressed median line. The elytra are 

 shaped as in B. insequale, and are provided with seven or eight very deli- 

 cately impressed longitudinal striae, made up apparently of a series of ad 



