(50 TERTIARY COLEOPTERA OF NORTH AMERICA. 



a slight and narrow neck, the surface smooth, with a. tew short and deli- 

 cafe scattered hairs. Antenna' about as long as the head and neck, the 

 joints beyond tin- rirst nearly quadrate, scarcely if at all enlarging apically. 

 Thorax scarcely longer than and of the same breadth as the head, appar- 

 ently larger apically than at bast-, smooth, with a few short and delicate 

 scattered hairs. Legs rather short. Elytra a little longer and somewhat 

 broader than the thorax, apically squarely truncate, with a slight sutural 

 stria, more distinct basally, and very sparsely pilose. Abdomen rather 

 slender, equal, with a bluntly ronnded tip, smooth, with a few scattered 

 hairs. 



Length, 5.1 mm. The specimen is preserved on a side view, so that 

 the breadth can not lie accurately given, but assuming that of the abdomen 

 to be the same as the height, the breadth behind the elytra is 0.85 mm. 



Florissant, Colorado; one specimen, No. 26"). 



LEPTACINU.S MACLUKEI sp. nov. 

 PI. VII, tigs. T. 15. 



Head half as long again as broad, parallel sided posteriorly, tapering 

 anteriorly, very rapidly narrowing behind to a slight and slender neck; 

 surface smooth, with scattered hairs on minute tubercules. Antennae only 

 a little longer than the head ar.d neck, the rirst joint nearly a fourth of the 

 total length, the second to the fifth joints longer than broad, the sixth quad- 

 rate, the remainder broader than long, the whole antenna enlarging very 

 slightly and very gradually toward the tip, and the apical joint subglobose. 

 Thorax slightly broader and a little shorter than the head, quadrangular, 

 with equal sides, smooth, and clothed like the head. 'The legs agree very 

 well with modern Leptacini and are not apparently any shorter. Elytra 

 broader and longer than the thorax, thinly clad with short hairs. Abdomen 

 very slender, but apparently enlarging a little toward the tilth segment and 

 then tapering to a rounded point, the segments sparsely clothed with deli- 

 cate hairs. 



Length, 7 mm.; breadth of elytra, l.lf) mm. 



Florissant, Colorado: nine specimens, Xos. ,'51<;'.l, 42<X, ">379, f><>3<>, 

 ii 12:;, 6548, loxiis, H2~>i;, i;i<;4<>. 



Named in memory of one of the earliest American geologists, William 

 Maclure. 



