r 



518 bulletin: museum of comparative zoology. 



Described from one specimen. 



Type. — In the Museum of the University of Colorado. It was col- 

 lected at Station 14, Florissant, Colo., by G. N. Rohwer, while a 

 member of one of Professor Cockerell's parties. 



Separates from L. florissantensis, with which it agrees in the rela- 

 tively coarse interstitial punctuation, by having a much finer and 

 sparser sculpture of the head and particularly of the thorax. The 

 generic reference is provisional, being based mostly on facies. 



Athous lethalis, sp. no v. 

 Plate 6, fig. 1, 2. 



Form elongate, parallel. Head finely and extremely densely punc- 

 tured and with a short pubescence. Antennae long, slender, faintly 

 serrate, apparently not entire but reaching far beyond the prothoracic 

 hind angles, basal joints too poor to allow of their definition. Pro- 

 thorax punctured similarly to the head but a trifle more coarsely and 

 less deeply, length and breadth equal, front angles slightly prominent, 

 sides nearly straight to the hind angles which are acute and a little 

 divergent, base sinuate each side. Scutellum oblong oval. Elytra 

 a little over three times the length of the prothoracic median line, 

 apices conjointly rounded, finely striate and pubescent, the striae with 

 small, deep, nearly circular or slightly elongate punctures which are 

 separated in the series by their own diameters or something more. 

 I'nderside of prosternum closely and finely punctured, the prothoracic 

 flanks less strongly, sculpture of the remainder of the thoracic scle- 

 rites and abdomen very obscure. Length, from front margin of pro- 

 thorax to elytral tip, 8.40 mm.; of elytron, 5.50 mm. 



Described from one specimen, with counterpart. 



Type.— No. 2,728 and 2,729 M. C. Z. Florissant, Colo. (No. 8,464 

 and 8,713 S. H. Scudder Coll.). 



The prothorax is ornamented with a broad brown stripe, about one 

 third of the discal width, occupying the median area from base to 

 apex, similar to that seen in the recent A. excavatus, from California. 

 The latter insect, however, is much more coarsely sculptured. The 

 coxal plates are not well displayed in the fossil, but the prosternal 

 lobe and sutures, as well as the general form, correspond well with 

 the genus in which I have placed it. 



