24 



THE CANADIAN ENTOMOLOGIST. 



Ceruchus, MacL. 

 C. piceus, Web., is the only representative in the east, but two others 

 occur in the Pacific provinces, so that they are all included in the table. 

 They are more convex insects than Fiatycerus, highly polished and 

 shining. In colour all are brown. The males have the mandibles 

 highly developed, and with an enormous median internal tooth. The 

 head is also much broader in that sex, and bears a deep frontal excavation . 

 Elytra striate only on the disk. Striae fine, intervals very strongly 



punctate. .52 in punctatus, Lee. 



Elytra striate on disk and sides. 



Stria? deep, coarsely, strongly punctured. .64-.68 in. .striatus, Lee. 

 Stri« shallower, more sparsely and less deeply punctured. (Fig. 14.) 



.40-. 60 in piceus, Web. 



Both punctatus and striatus are known 

 from Vancouver Island, where I got them in 

 1889. In the same region occurs Sinoiiendron 

 rugosum, Mann., which belongs to the division 

 of the family with straight antennae, but may at 

 once be distinguished from its neighbors by the 

 fact that the clypeus bears a recurved horn, 

 much longer in the males. In this sex the 

 thorax is higher and sharply declivous anteriorly, 

 form of body is more cylindrical than any of our other 

 Lucanidiv, while the sculpture is extremely coarse, the thorax being very 

 coarsely confluently punctured, becoming rugose in the females. The 

 elytra are striate, but the lines are fine and almost effaced by large 

 punctures. Length, .44-. 7 2 in. A male is shown in fig. 15. 



Passalus, Fabr. 

 This genus is represented only by Passalus corjiutus, Fabr., which 

 must be rather rare in Canada, though common farther south. It is a 

 very thick-set, heavy, shining brown beetle, 1.24 to 1.64 inch, in length, 

 parallel-sided, the prothorax quadrate, about as broad as 

 the elytra and with a distinct median groove. The head is 

 narrower, without great mandibular development, but bear- 

 ing a curious horn, which has the tip bent forward. The 

 antennge are stout, pubescent, and while not geniculate, 

 seem to lie in a curve with the hollow anteriorly so as to 

 give something of the same optical effect. The elytra are 

 deeply striate, the striie very finely punctured at bottom. 

 A slightly reduced representation is shown by fig. 16. 



Fig. 



The 



