24 TERTIARY COLEOPTERA OF NORTH AMERICA. 



or simple elytra. It is of about the same size as P. immpellyi; the head is 

 smooth with a similar, but sometimes inconspicuous, transverse impressed 

 line between the antennae; the thorax is squarely truncate anterioi'ly, with 

 slightly projecting front angles, sides broadly, rather regularly and some- 

 what strongly rounded, so that the thorax is as broad posteriorly as ante- 

 riorly and fully half as broad again as long. Some specimens show a 

 tendency to subangulate sides, and the slight median impressed line is 

 scarcely noticeable in any (not given in the figure); the surface is entirely 

 smooth. The elytra are smooth and flat but for the regular and not deep 

 strise, which show no punctuation and leave the interstitial spaces without 

 convexity; there is a moderately long sutural stria connecting with the first 

 longitudinal stria. 



Length of body, 16 mm.; of elytra, 9 to 9.5 mm.; width of one, 3 to 

 3.6 mm. 



Florissant, Colorado; six specimens, Nos. 259, 521 and 4640, 1781, 

 3105, 5131, and No. 1.557 of the Princeton College collection. 



I give this species the name of C. D. Walcott, Director of the United 

 States Geological Survey. 



EVARTHRUS LeConte. 



The following is the only known fossil species of this genus, a consid- 

 erable north temperate group with about a dozen North American species. 



EVAKTHRUS TENEBRICUS Sp. nov. 



PL I. fig. 8. 



Of this only the head is preserved, but this is so different from any- 

 thing else which has been found fossil that it merits mention. It is of 

 about the size of Evarthrus gravidus Hald., and is placed in this genus on 

 account of the brevity of the last joint of the labial palpus. The head is 

 subquadrate, about as long- as broad, slightly naiTOwer in front than behind, 

 with two transverse lines, one in front of and the other behind the antennge, 

 the former the transverse impressed line of the upper surface, the latter the 

 base of the labium seen through the head ; the eyes are rather large, but 

 not at all prominent ; the mandibles stout and strongly curved ; the maxil- 

 lary and labial palpi unusually stout, the joints of the former subequal, not 

 more than twice as long as broad ; of the latter, the ultimate very much 



