WICKHAM: NEW MIOCENE COLEOPTERA FROM FLORISSANT. 451 



OLIGOMERUS FLORISSANTENSIS, sp. nov. 

 Plate 6, fig. 2. 



Form elongate, rather slender. Head of moderate size, minutely 

 and closely punctulate, eye not defined, antennae wanting. Pro- 

 notum, in side view, subcuneiform, finely punctulate. Elytron long, 

 very finely sculptured but with well-defined, sharp though narrow 

 punctate striae, the punctures small, well impressed, longitudinally 

 elliptical, those of the same row separated individually by something 

 less than their own long diameters. Leg (only one being at all well 

 shown), short and rather slender. Length, from front margin of 

 pronotum to elytral apex, 4 mm. 



Described from one specimen. 



Type. No. 2,523 M. C. Z. Florissant, Col. (No. 5,921 S. H. 

 Scudder Coll.). 



In size and outline, this beetle is about like Ernobius effetus, so 

 similar in fact that allowing for the difference in thoracic outline which 

 might be due to distortion I should have considered them as repre- 

 senting one species if it were not for the well-defined punctate striae 

 of the elytra of the present insect. The nearly semicircular structure 

 projecting on to the head near the anterior prothoracic margin seems 

 to be not an eye but probably due to some imperfection in the stone. 

 Of course the generic reference cannot be made with any great degree 

 of certainty, but the fossil is not unlike the modern 0. obtusus of east- 

 ern North America. 



OLIGOMERUS (?) DURATUS, sp. nov. 

 Plate 6, fig. 3. 



Form elongate. Head large, minutely punctulate and rugulose. 

 Eye of moderate size, elliptical. Antennae wanting. Prothorax 

 short, subcuneiform in side view, back scarcely arched, front margin 

 apparently but little or not at all projecting, surface finely punctate 

 but somewhat more coarsely than the head. Elytron long, the outer 

 edge broken so that the relative proportions of length and breadth 

 cannot be determined with exactitude, surface with faint evidence of 

 obtuse costation or striation, punctuation very fine and confused. 

 Underside of body minutely punctulate, more strongly on the thorax 

 than on the abdomen. Legs short and slender. Length, 4.25 mm. 



