THE CANADIAN ENTOMOLOGIST 387 



of the sculpture, thorax, or claws is necessary to separate them. 

 Both species were taken on the same patch of Corylus at Sherborn, 

 Mass., and for some time remained mixed in my boxes as arcuatus. 

 It would seem from this and from other facts at hand that the 

 food plant has much to do with the variations in colour that are 

 exhibited by this interesting genus. 



Collops tricolor Say. Several specimens were taken at Paris, 

 June 14, 1910, running about on the sun-scorched ledge at the 

 summit of a hill of perhaps a thousand feet elevation. 



Ptinus hicinctus Sturm. A number of dead specimens of this 

 species were taken by sifting the debris from the grain bin and the 

 barrels and boxes in the corn house at Wales, about July 1, 1905. 

 I also noticed that many of the numerous pellets of rat dung were 

 perforated with a neat hole in the side and contained a whitish, 

 hairy larva. A few specimens were bred, but most of the material 

 was sent to Prof. H. C. Fall who determined the species for me. 



Ptiliniis riificornis Say, has been taken quite commonly at 

 Monmouth, June 21 to 25 on several years, and at Wales it was 

 found boring into beech wood June 25, 1910. In my series 

 there are three males and twelve females, which shows the relative 

 abundance of the sexes. 



Odontosphindns denticollis Lee. Three were taken on the top 

 of an oak stump in a species of flattened fungus, June 27, 1912. 



Trox scaher Linn. At Monmouth on November 28, 1907, 

 I found a large number of adults under an old blanket which had 

 evidently been lying for some years beside a cart road. 



Serica tristis Lee. This species has been very common on 

 Alnus incana, at Monmouth June 21, 1910, at Wales June 26, 

 1909, at Paris June 19, 1912, and was taken at Fabyans, N. H. 

 July 4, 1914. It has been seen eating the petals of blackberry 

 flowers. 



Aphonns tridentata Say. I have always been puzzled to 

 account for finding dead specimens of this species on well-travelled 

 roadsides, in beaten paths, and in sand pits. The specimens 

 are generally spread out with no indications that they have been 

 killed by birds or insects, and many times in perfect condition. 



