NO. 1982. FOSSIL COLEOPTERA FROM FLORISSANT— WICKHAM. 291 



judging from its shape and texture, ninth to eleventh forming a 

 rather long and distinct club. Pro thorax injured on the left side, 

 the right is furnished with two subgranular tooth-Uke projections, 

 sides in front and behind these processes obUque to apex and base. 

 Elytra slightly broader than the prothorax, sides subparallel to 

 behmd the middle, thence arcuate to tip, inflexed margin long and 

 rather broad. Length, 2.40 mm. Width of elytra, 1.20 mm. 



Type.— Csit. No. 59^40, U.S.N.M. 



One specimen, which seems to be a good CryptopJiagus. The basal 

 antennal joint is less swollen than in the numerous recent species 

 examined. The sculpture is obUterated and the legs can not be 

 made out. The species is named after Dr. R. S. Bassler, of the 

 United States National Museum. 



Genus TENEBROIDES Filler. 



TENEBROIDES CORRUGATA, new species. 

 Plate 23, fig. 3. 



Preserved in ventral view. Body elongate, head somewhat 

 roughened beneath. Prothorax distinctly broader than long, front 

 margui concave, basal nearly straight, sides nearly straight and 

 divergent from base to a point in front of the middle, thence arcu- 

 ately narrower to apex, which is the same width as the base. Front 

 angles acute. Elytra showing only the epipleural portion, which is 

 transversely corrugated, as shown in the figure. Metasternum long, 

 side piece narrow, subcuneiform. Posterior coxae transverse, ap- 

 proximate. Abdominal ventral segments subequal, except the last, 

 which is somewhat shorter. Length, 6.55 mm. Greatest width of 

 elytra, 2.25 mm. 



Type.— Csit. No. 59641, U.S.N.M. 



One specimen. By the form, and what can be seen of the sternal, 

 coxal and abdominal structure, this insect agrees weU with the genus 

 in which I have placed it, the size being about equal to that of our 

 smallest living North American species. The corrugation of the 

 elytral epipleurse, which seemed at first to be a disturbing element, 

 is shown, in less degree, by several of our native forms. I have 

 found evidence of it in T. mauritanica, T. castanea, T. laticollis, T. 

 marginata, and T. semicylindrica. 



Genus NOSOTETOCUS Seudder. 



NOSOTETOCUS DEBILIS Seudder. 



One specimen, length, 4.50 mm., width, 3.25 mm. These meas- 

 urements correspond with those of Seudder, but the outline is a little 

 different. 



Cat. No. 59649, U.S.N.M. 



