151 
.1 crowns of the plant, either eating the smaller roots or pene- 
ting and mining the interior of the crown and main root. These 
re usually confounded by fruit growers under the general name of 
*own-borer;” but a cursory examination was sufficient to show 
d at least two insects were represented by them, one form, which 
urred only in the crown and main root, being destitute of legs, 
i the other, found most commonly in the earth about the plant’ 
hough sometimes penetrating the crowns from without, being 
'ays provided with three short pairs of jointed legs on the seg" 
nts immediately behind the head. The first, or "footless, form 
s the true crown-borer , {Tyloderma frag aria,) which was fully dis¬ 
used in the last report from this office; and the second was evi- 
ltly that known as the strawberry root-worm, to which Prof. Riley 
s the first to call attention. 
- 
t was at first assumed that these root-worms represented but a 
gle species; but actual breeding of specimens taken from various 
Pities in Union county, and at different seasons of the year, has 
illy demonstrated the fact that they belong to three distinct, but 
lely related species, all members of the same family, (Chryso- 
i-idae,) and of the same tribe (Eumolpini), but of different genera. 
Vhile the injuries inflicted by these various root-worms are ap- 
ently identical, their periods and life histories are somewhat 
erent, and it will consequently be best to treat them separately, 
save repetition, I give first the characters common to all three 
cies, following these by a separate discussion of each. 
DISTINGUISHING CHARACTERS. 
'he root-worms may be known from the crown-borer w (Plate IX, 
. 6, a), to which they bear a strong superficial resemblance, by 
absence of jointed legs in the latter, as already noticed; and 
n young white grubs, (Plate VII, Fig. 1, 2) with which they are 
n associated in the ground, both feeding alike upon the root of 
strawberry, by their relatively shorter and thicker bodies, by 
greatly inferior development of the abdomen, and by the fact 
t they are not nearly as much arched from before backwards as 
grubs. 
i the root-worms, the length is only about twice the breadth, 
le in white grubs of that size, it is four or five times as great. 
Jthe former the abdomen is but little longer than the head and 
tjx taken together, while in young white grubs it is at least twice 
ong. The latter insects have also the posterior half of the abdo- 
l somewhat swollen, rounded and smooth, while in the root- 
ms the terminal segments are smaller than the preceding, and 
at least equally wrinkled and tuberculate. 
' COMMON CHARACTERS. 
j arvcc. —The root-worms here treated (Plate VII, Fig. 7; and IX, 
3.) are all of nearly the same size, 3 to 4 mm. long (.12 to 
iuch) by half as wide, and all are white, except the head and 
1 segment, which are pale yellowish brown. The segments are 
ve in number behind the head, with a rudimentary thirteenth 
