‘PHE BEET LEAF-BEETLE. det 
days in September hundreds of the beetles may be seen flying from 
the beet fields in search of hibernating quarters, which they usually 
succeed in finding before the first severe frosts. 
Practically all overwintered beetles die during the latter part of 
May or in June, although occasional individuals may live until the 
“y first days of July, from which it may be seen that the beetles of the 
first generation live a full year. 
REARING RECORDS. 
April 6 a mating pair of overwintered beetles was placed in a 
rearing cage containing growing plants of Dondia erecta, one of the 
sea-blites. The first eggs were deposited April 9. A second cluster 
of eggs was deposited April 11. The record is as follows: 
First generation. 
PSV S A Wie aoe 555s oS Eas 90s Re Be ee oe ees Beetles collected. 
2; AN U3e1u Ga BS Ge ess See Se ee ee ee ee Eggs deposited. 
[2 SRT GLU es eR i Se Sn a a -Larvee hatched. 
TAIT 2S es ae a ee ee Larvee reached maturity. 
Ma ye2S = Sixers ee pee eee es OT SE pup formed. 
SU EPETN GT Ge = se ae OS ee First adults developed. 
From the foregoing record the developmental periods are as 
follows: 
Days. 
BEB SETA (0 (ge es 18 
reaenicd eT ELON) tree eee ee Bohs ster ea EO 
Papal eC niO Ga we oe ee a Gd tier oO Se et roma tee & 9 
EOieMte POO cELOMm-e CoS sO a0 Ulta 56 
The beetles which issued June 6 were placed in a separate cage 
4 and supplied with lamb’s-quarters (Chenopodium album) as food. 
The record is as follows: 
Second generation. 
Snipe See Sk ____Beetles developed. 
BRera@ tigers eee FS py te _First eggs deposited. 
Sipitnes pa as mri Sy aE te Say First larve hatched. 
July 2S aha a ees ere First larvee reached maturity. 
=] Gn es ae a ee ge First pupz formed. 
Shin ys Pipes ee Bee _First adults developed. 
From the foregoing record the periods are as follows: 
Days 
< SMEATON. = POMOC]. = a Se Pa et SAS Rs See ee 
+ emer Ape TOs. ate ho Se eRe en SS ee 19 
Pada CE LOU tee See ES ees ke eee 
Total period from ese fo-adultsse 2 <2 ee 35 
The beetles of the second generation, as well as those of the first, 
fed heartily throughout the remainder of the season on the foliage 
