ELATERID.E. 97 



OXYGONUS LeCoute. 



A North American genus with only a couple of species. A single 

 fossil has been found in Utah. 



OxYGONUS MORTUUS. 



Oxygonus mortuus Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., II. 81 (1876); Tert. 

 Ins. N. A., 496, pi. 5, figs. 110, 111 (1890). 



White River, Utah. 



ADOCETUS {dSdutjTo?) gen. nov. 



Head ver j large indeed, together with the large eyes full}' as broad as 

 the front of the pronotum, the front broad, truncate or feebly rounded; 

 antenufe obscurely preserved, but apparently much as in Scaptolenus, but 

 with much less apical enlargement of the joints. Prothorax strongly trans- 

 verse, nearly twice as broad as long, considerably and rapidly tapering, the 

 front margin about three-fourths the length of the hind margin, gently and 

 uniformly emarginate ; hind margin scarcely angulate, sides scarcely arcuate, 

 the outer anterior angles rectangular; both lateral and front borders equally, 

 broadly, and regularly margined, the outer posterior angles rounded and in 

 no way produced. Elytra at base of the breadth of the thorax, regularly 

 tapering by the arcuation of the outer margin, the apex perhaps pointed. 

 Hind coxse very large, somewhat produced posteriorly next their inner side, 

 the legs large and stout and apparently flattened. Abdomen with six seg- 

 ments, the first five of equal length and truncate, the sixth longer and conical. 



The single species referred here has a close resemblance in general 

 outline to a buprestid like Psiloptera, but the separation of the first and 

 second ventral segments shows it to be an elaterid, the transverse labrum 

 and the number of ventral segments a cebrionine. 



Adocetus buprestoides sp. nov. 



PI. X, fig. 12. 



Surface of head more or less bluntly and rather finely rugulose. 

 Thorax more heavily and more distinctly rugulose, and at the same time 

 sparsely punctate, the puncta more distinct, because not confused by 

 rugae, on the front margined area; apparently also clothed with very 



MON XL 7 



