142 
b. A small, white, footless grub, with brown head. 
Tue SrrawBerry Crown-Borer. 
Tyloderma fragaria, Riley. 
Order Conteoprers. Family CurcuLionipa. 
[Plate IX, Fig. 6.] 
A full and elaborate account of this species was given in my last 
report, and I recur to it here only to add a few particulars re- 
specting iis life history. 
The latest observations mentioned in the article in the Twelfth 
Repors were mide on the 10ih of April, 1833. On the 20th of May, 
I dug up at Centralia a great number of plants from fields in which 
the borers had been abuadant the previous year, and opened the 
crowns, without fin ling so much as a single specimen. On the 15th 
of June, a very few adult beetles were still to be seen in strawberry 
fields at Anna, as reported to me by Mr. C. W. Butler, of that 
place. On the 9th of July, at Anna, larve of the new brood were 
found in the main roots of strawberries, by my assistant, Mr. Garman; 
and at Villa Ridge on the 11th, larve, pupe and recen‘ly trans- 
formed imagos occurred in the same situation. On the 12th, pupe 
and imagos but just transformed, were also found at Anna, and a 
few larve occurred among plants which had been set that spring. 
On the Ist of August, mature larve and several adults were taken 
from the crowns of strawberries at Cobden, although they were here, 
as e'sewhere throughout Ilinois, very rare, even in fields where 
they had been abundant the year before. 
On the 6th of August, all the stages were found at Centralia, the 
larve being all full-grown. On the 6th of September, when Mr. 
Webster visited this place, no larve occurred in the plants, but adults 
and pupz only were taken from them. These were in the margins 
of a tie'd aljaceat to some ranaway strawberries which had spread 
throughout the orchard, where they had been allowed to grow with- 
out interference for several successive years. On the Vth of De- 
cember, Mr. Garman found at Anna a sinele adult, taken in the 
upper part of ths root of the strawberry plant; and several oc- 
eurred on the 10th among rubbish in a field which had not been 
mulched. 
These observations extend somewhat the period over which the 
development of the brood is scattered, bus give us no slightest hint 
of a second brood. It also appears: that in rare instances beeiles 
hibernate within the crown of the strawberry, and consequently may 
be conveyed to a new field by. plants dug up in the spring. . How- 
ever, as only a single beetle has been found by us in these situa- 
tions, out of the many hundreds of crowns examined, it 1s evident 
that this is too infrequent an occurrence to have any important 
significance. Respecting the undoubted fact of a great diminution 
in the numbers of this insect as compared with those occurring last 
year, I have no explanation to offer, since the weather would not 
seem to have been unfavorable to them. 
