82 TERTIARY I'OLEOPTERA OF NORTH AMERICA. 



MYCOTRETUS IUNOTATUS. 



M ,/,>, f,; tus li'inntntnx Scucld.. Hull. IT. S. (reol. GeooT. Surv. Terr.. IV. 7(>3-7<i4 (1*7S); 

 in Zittrl. Ilandh. el. I'ula-ont.. (I). II. SOU. tig. 1053 (1885); Tert. Ins. N. A.. 50:.'- 

 .>().".. pi. 7. tiy. : J >o (is'.tit). 



Given River, Wyoming. 



CTJCUJID^E. 



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

 aries of Europe and North America, equally divided between the t\vo both 

 as to species and genera, one genus of the five recognized having been 

 found in both countries, (hie of the American genera is regarded as 

 extinct, 



PEDIACUS Shuckard. 



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

 which three occur in North America, One fossil is known, coming from 

 ( 'olorado. 



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

 the antenna-, the similarity in size of the first joint to the succeeding, the 

 hick 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 simiation or denticulations on the side of the prothorax. 



PEDIACUS PERK 'LIT ANS sp. nov. 

 PI. IX. fig. 7. 



The single specimen referred here agrees very closely with our native 

 species of 1'ediacns, and especially with /'. tlr/trr**/!* llerbst, excepting in 

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

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

 nent, coarsely faceted eyes, a flattened quadrate snout, nearlv 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 antenna- 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 antenna- is slightlv 

 less than the width ol the prothorax. I 'rothorax subquadrate, broader than 



