FOSSIL COLEOPTERA y^ 



By all the characters of the underside, this insect seems to go 

 very well into the Mycetophagid*. The antennas are of a type 

 shown in some of the recent North American species of Myceto- 

 phagus {Tritoma of the recent European catalogues and of 

 Casey), though relatively a little shorter. The general average 

 of characters shown, the build, sculpture, and so on, would seem 

 to ally it most closely to the recent T. notatula of Casey, from 

 British Columbia and the Northwest Territories. I have named 

 it after Dr. S. W. Williston, in recognition of the high services 

 he has rendered in entomology and palaeontology. 



M. EXTERMIXATUS D. sp. (Plate IV, Figs. 9, 10.) Form elongate. Head 

 moderately large, much broader than long, punctuation close, distinct, and 

 moderately coarse. Eyes rounded, not large. Antennae not showing the 

 basal joints, but terminated by a large three-jointed club, the joint im- 

 mediately preceding being a little more than half the width of the club. 

 Prothorax broader than the head but very short, about one and two-thirds 

 times as wide as long, sides rather feebly rounded, base arcuate, about 

 equal to the apex, surface finely punctate. Elytra subparallel at sides, 

 conjointly rather sharply rounded at apex, length equal to one and two- 

 thirds times their combined width, surface with rather fine, scattered, ir- 

 regular punctuation and traces of fine stria*. Length, as preserved, 5.40 

 mm., in life probably a little less since the head and abdomen are apparently 

 unnaturally distended. ^ 



Probably not a true MycetopJiagus, though belonging to the 

 same family. In form it is similar to the recent M. pliiriguttatus 

 but is differently punctured, the sculpture of the pronotum and 

 elytra being less pronounced in the fossil. The antennae have a 

 wider club than any of the modern forms that I know. There is 

 no evidence of hairy vestiture. 



CoLASTUs EricJis. 



C. PYGiDiALis n. sp. (Plate I, Fig. 3.) Form elongate, entire upper 

 surface roughened, apparently scabro-punctuate, most strongly on the elytra, 

 less so on the pronotum, and still more finely on the head and the exposed 

 abdominal segments. Head incomplete in outline. Prothorax about one 

 and one-half times as wide as long, the apex subtruncate, sides not much 

 rounded. Scutellum of moderate size. Elytra about twice as long as the 

 prothorax, exposing two full segments of the abdomen, the last of which is 

 much the longer and is marked by a strong longitudinal median groove. 

 Length, 2.80 mm. 



One specimen, showing both obverse and reverse. It is slightly 

 more elongate than the modern species of Colastus with which 



