60 TERTIARY COLEOPTERA OF NORTH AMERICA. 



a slig-ht and narrow neck, the surface smooth, with a few short and deh- 

 cate scattered hairs. Antennae about as long as the head and neck, the 

 joints beyond the first nearly quadrate, scarcely if at all enlarging apically. 

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

 entl)' lai'ger apically than at base, smooth, with a few short and delicate 

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

 broader than the thorax, apically squ.arely truncate, with a slight sutural 

 stria, more distinct basally, and A^ery sparsely pilose. Abdomen rather 

 slender, equal, with a bluntly rounded tip, smooth, with a fcAy scattered 

 hairs. 



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

 the breadth can not be 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. 265. 



Leptacinus maclurei sp. nov. 

 PI. VII, figs. 7, 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 tubercixles. Antennae only 

 a little longer than the head and neck, the first 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 enlai-ging 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 fifth segment and 

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

 cate hairs. 



Length, 7 mni.; breadth of elytra, 1.15 mm. 



Florissant, Colorado; nine specimens, Nos. 3169, 4268, 5379, 5630, 

 6423, 6548, 10898, 11256, 13640. 



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

 Maclure. 



