THE CANADIAN ENTOMOLOGIST. 99 
subquadrangular with prominent anterior and posterior angles making it 
appear constricted in the middle, it is channelled with an irregular discoidal 
impression on each side; a few large dusky punctures are observable 
where the channel terminates ; elytra with ten equidistant rows of large 
punctures which converge at the apex ; besides these there is an abbrevi- 
ated row at the base next the suture, as in many Harpalide, &c., the apex 
of the elytra terminates in two teeth or spines; the inner one short and 
“dentiform, the outer one long and spiniform ; legs and anal portion of the 
abdomen yellow, the former with all their articulations dusky at the 
extremity. 
The sculpture of the elytra in this species much resembles that of 
another aquatic genus Hadliplus, Lat. 
ON SOME OF OUR COMMON INSECTS. 
5. THE GRAPE VINE PLUME.— Pterophorus periscelidactylus. 
BY W. SAUNDERS, LONDON, ONTARIO. 
During the latter part of this month and early in June those who have 
grape vines under their charge are often annoyed at finding the terminal 
Fig. 15. 
leaves of the young and tender branches tied 
by means of silken threads into a sort of 
ball shaped mass, and within the hollow 
sphere thus formed is found a small whitish 
hairy caterpillar, which feasts on the tender 
leaves and young blossom bunches. Usually 
but a single occupant is found in each en- 
closure, but occasionally we have found two, 
and, in one instance, three. 
The very young larva is said to besmooth, 
or nearly so, the hairiness becoming more 
perceptible after each moult. 
In fig. 15 this larva is represented nearly 
5 ra full grown at a. It is then about half an inch 
“4 long with a small yellowish green head, with 
’ a band of black across the front, and a 
yellowish green body, with transverse rows 
of dull yellow tubercles from each of which arises a small tuft of white 
