APPENDIX. 187 



in the water, and with the larvae, which are knoAvii 

 as Water-Tigers, may be captured with a net. 



Gyrinid^, Whirligigs. — These well-known Beetles 

 are found upon the surface of the water; but the 

 larvae live beneath it. Both may be taken with the 

 net. 



Hydrophilid^, Yfater- Beetles. — These are small 

 insects, found in ponds and other bodies of fresh 

 water, and, with the larvae, may be taken with the 

 net. 



Pla^typsyllid^, Parasitical Beetles. — The only 

 species which represents this family is found as a par- 

 asite, on the American Beaver. I have never found 

 them common, however. Indeed, many Beavers do 

 not have them at all. 



SiLPHiD^, Carrion Beetles. — Members of this family 

 are usually large and showy Beetles. They may be 

 captured by exposing the carcass of an animal during 

 the summer. They may be found crawling over it at 

 night, or beneath it in daytime. 



PsELAPHiDJE. — I have captured species of this fam- 

 ily flying at twilight. Some are found beneath stones 

 and some in the nests of ants. They are all small in 

 sects. 



Slaphylixid^. Rose-Beetles. — These long-bodied 

 singular-looking Beetles are found beneath stones, 

 leaves, bits of wood, etc. 



Mr. Henry Hubbard, of Cambridge, informs me that 

 he has captured a great many of this family, and mem- 

 bers of other families having similar habits, by gath- 

 ering leaves and other debris in the woods, and sift- 

 ing it through a rather coarse sieve over a white cloth. 

 The insects will then fall through. I have found 

 them in large numbers, with species havinj^ similar 

 habits, beneath stones, during a dry season in mtumn. 



