THE CANADIAN ENTOMOLOGIST. 163 



Stouter ; the front is more shining, with the epistomal carina often more 

 strongly developed. The disk of the pronotum is more shining behind. 

 The elytra bear regular rows of punctures, which are smaller than those of 

 dispar, and not so closely placed. In serratns the diameter of the 

 punctures is almost always distinctly less than the distance between the 

 punctures in the rows. (In dispar the diameter of the punctures is 

 usually equal to or greater than the distance between the punctures in the 

 rows \ this is more noticeable near the suture.) These punctures bear 

 very minute hairs. The interspaces bear in front minute punctures, which 

 are replaced behind by small granules. From these punctures and granules 

 arise the long hairs with which the elytra are clothed. The seventh inter- 

 space is raised behind into an acute, serrate ridge, which forms the ventral 

 margin of the declivity on the sides. This ridge bears three or four acute, 

 curved, separated spines and several smaller acute granules. This ridge 

 is present also in dispar, but is not so strongly raised, not so acute, and 

 though usually slightly crenulate, and sometimes with one or two minute 

 granules, is never at all serrate. In serratus the fifth abdominal sternite 

 has the punctures of the median area much smaller and sparser than those 

 on the sides, and the anterior margin of the fourth sternite is usually nearly 

 smooth. In dispar \\\t abdominal sternites are usually cipially punctured. 

 In serratus the anterior tibiie are wider than in dispar, and with the teeth 

 longer and more closely placed. Aside from these differences, the sculp- 

 ture of serratns ( ? ) agrees closely with that of dispar. 



Male: Length, i^-i^ mm. Front moderately convex, sometimes 

 with a slight median impression, shining, with punctures sparse and small 

 across median area, but close on epistomal margin ; hairs long and slender, 

 with dense fringe of shorter yellow hairs along epistomal margin. The 

 pronotum is rather sparsely clothed with long slender hairs. The outline 

 from above is subcircular, very slightly narrowed in front and broadlv 

 rounded in front and behind. The cephalic asperations are very minute. 

 The caudal half is finely punctured, with a smooth median space of 

 variable extent. The elytra are sparsely hairy, with long hairs from the 

 interspaces, and with rows of widely-separated punctures (much as in 

 the $ ) bearing short hairs ; interspaces with small punctures, and minute 

 granules behind. The interspaces are not much roughened. The ridge 

 of the seventh interspace on the declivity is, as in the allied males, not 

 much developed, with a few small granules, but no teeth. The tibiae are 

 more slender than in the female and with fewer teeth. The venter is 

 sparsely and coarsely punctured. In Beiula lutea, diseased trees, Ste. 

 Anne de Belle vue, Que.; St. Hilaire, Que. 



