THE CANADIAN ENTOMOLOGIST. 191 



only the larvje, but the beetles, feeding freely on the leaves, showing no 

 disposition to feed on i)lant lice, the generally acknowledged food of the 

 Coccinellidce. To test this, one of the beetles was placed in a jelly dish 

 with a leaf, upon which it at once went to feeding, and I saw them doing 

 the same thing on the vines. I'he larvae in feeding eat the whole of the 

 tissue on the under side of the leaf, except the veins, leaving the upper 

 epidermis. The beetles usually eat this, leaving only the veins. 



Assuming the tgg period to be 5 days, and the third and fourth larval 

 periods the same as the first and second respectively, we would have a 

 period from the egg to the imago of 35 days, which can not be far from 

 correct. They probably pass the winter in the imago state, as do others 

 of the family. 



PSEPHENUS LECONTEI— ON THE EXTERNAL ANATOMY 



OF THE LARVA. 



This singularly interesting larva occurs in abundance in the rapids of 

 the Niagara above the Falls. The writer has taken it in other rapid 

 streams in Western New York, also at difterent places in Michigan ; 

 besides, its occurrence in widely separated localities has been recorded by 

 observers, hence we are led to believe that it is distributed throughout 

 Eastern North America. Dr. Leconte has described another species, Ps. 

 haldemanni, from the peninsula of California ; its larva, it seems, has not 

 been described. 



The first notice of our larva is that by Dr. Kay in Part VI. (Crus- 

 tacea), page 53, Zoology of New York, 1844. It is described in that 

 work as a new genus and species of Crustacea, under the name Fluvicola 

 Herricki ; a poor figure is given. Dr. John L. Leconte, in Agassiz's Lake 

 Superior, page 241, 1850, describes it more exactly; he gives an account 

 of the parts of the mouth ; no figures are given. In the proceedings of 

 the Philadelphia Academy of Sciences, Vol. A'L, page 41, 1852, the same 

 author has a brief account of the larva, but adds no additional facts. In 

 Dr. Packard's Guide to the Study of Insects, page 450, 1870, the charac- 

 teristics of the larva are briefly stated, and a figure is given which shows 

 well enough the outline of the insect. 



