82 TERTIARY COLEOPTERA OF NORTH AMERICA. 



Mycotretus binotatus. 



Mycotretm Unotatus Scudcl., Bull. U. S. Geol. Geogr. Surv. Terr., IV, 763-764 (1878); 

 in Zittel, Handb. d. Palseont., (I), II, 800, fig. 1053 (1885); Tert. Ins. N. A., 502- 

 503, pi. 7, fig. 30 (1890). 



Grreeil River, Wyoming. 



A half dozen species of this family have been found in the older Terti- 

 aries of Europe and North America, equally divided between the two both 

 as to species and g-eaera, one genus of the five recognized having been 

 found in both countries. One of the American genera is regarded as 

 extinct. 



PEDIACUS Shuckard. 



A north temperate genus, with a limited number of specific forms, of 

 which three occm' in North America. One fossil is known, coming from 

 Colorado. 



The single species found fossil in America is peculiar for the brevity of 

 the antennse, the similarity in size of the first joint to the succeeding, the 

 lack of a distinct collar of equal width at the back of the head (notwithstand- 

 ing the presence of the transverse ridge behind the eyes) and the absence of 

 any sinuation or denticulations on the side of the prothorax. 



Pediacus periclitans sp. nov. 



PI. IX, fig. 7. 



The single specimen referred here agrees very closely with our native 

 species of Pediacus, and especially with P. depressws Herbst, excepting in 

 the absence of a collar-like neck to the posterior part of the head and in 

 having shorter antennae. The shape of the head is the same, with promi- 

 nent, coarsely faceted eyes, a flattened quadrate snout, nearly as long as 

 the head in front of the transverse ridge; behind the ridge the head con- 

 tinues to narrow. The first joint of the antennae is scarcely larger than the 

 second, and the second to the seventh are equal in size, and appear to have 

 a median ridge or furrow above ; the entire length of the antennae is slightly 

 less than the width of the prothorax. Prothorax subquadrate, broader than 



