50 TERTIARY COLEOPTERA OF NORTH AMERICA. 



ireaching back nearly to the middle of tlie elytra, most of the joints aoout 

 two and a half times longer than broad, slightly larger at tip than at base, 

 rounded. Thorax about a fourth broader than long, a little broader than 

 the head, with gently convex sides and base, and all the angles similarly 

 and slightly rounded, the surface smooth and apparently, like the head, 

 without hairs. Legs not very long, the femora considerably dilated, the 

 tibise slender but slightly enlarged at the tip, the tarsi very slender. Elytra 

 slightly longer than the head and thorax together, considerably bi'oader 

 than the thorax, smooth, with long and very distant delicate hairs. Abdomen 

 scarcely broader than the thorax, beyond the tips of the elytra longer than 

 the rest of the body together, smooth. 



Length of body, 9.25 mm.; breadth of elytra, 1.6 mm.; length of 

 antennae, 2.75 mm. 



Florissant, Colorado; two specimens, Nos. 11179, 12045. 



Named in memory of my honored teacher. Prof Louis Agassiz. 



Laasbium sectile sp. nov. 



PI. VI, fig. 3. 



This is a much stouter form than the last, and not so elongated, but in 

 all its essential features it agrees so well that it should fall in the same 

 genus; the short head and thorax, the long antennae and tegmina, with the 

 elongated joints of the former, mark it as allied. There is but a single 

 specimen and that not very distinctly preserved. The head is shorter than 

 broad, subtriangular, with rounded sides, and apparently smooth surface. 

 The antennae are imperfectly preserved, but are at least as long as the head 

 and thorax together, and probably longer, very slender, with joints which 

 beyond the basal joint and before the middle are about three times as long 

 as broad and nearly twice as broad apically as basally. Thorax apparently 

 almost twice as broad as long', broader certainly than the head, broadest 

 apparently just behind the head, with rounded sides, and the surface smooth, 

 with a few scattered hairs. Legs slender and apparently proportionally 

 longer than in L. agassizii. Elytra longer than the head and thorax together, 

 and broader than the thorax, smooth and at most with but a few scattered 

 hairs. Abdomen broader than the thorax but narrower than the elytra, 

 beyond which it is scarcelv so long as the rest of the body, equal or 



