i, 
THE BEET LEAF-BEETLE. 18 
From the foregoing record the periods are as follows: 
Days 
MBSE UTED eats Cee OCT EQ eee eS eg ee 6 
DEPENDS TOVSTETIOY fs 5 oe ea Rea ee PE Te eet et Dc 24 
| UD OEE EG) NE ECON ee eee aah 
RotalsperiodsErotmacess: (0° Ad Ults = 4 2 fo ee 41 
Tt will be seen that the adults of the third generation developed 
October 1. This was considerably later than the date when the 
majority of the beetles of the first and second generations, both in 
the field and laboratory, went into hibernation. The beetles of the 
third generation fed for a day or two and then went into winter 
ouarters. 
EGG-LAYING RECORDS. 
March 21 several overwintered beetles, which were then on the 
wing, were captured and confined in a cage with young Russian 
thistle for food. March 23 a pair of these beetles mated and were 
placed in a separate cage. By March 29 the female’s abdomen was 
noticeably distended with eggs. The record is as follows: 
Hogs deposited. 
JaN OSTA Lg 92 SA hs i ce ak ae re a 7 
April 9__ a BO spends ekene A eviee BROS oe es Lp a ae 34 
Jay Gitill ed WS =e i ees come le ae re ee PS e ere aioe 2 wipe Ee Fe 40 
PNY ON elt) Od US ee eaetne ae eee en ea eae Sie akan Se te Aa aD 
PAINTS Viess 2p eer a 8 Sy EO A SN a ag SS Se Rae Uh ay 5 
SVB ayer) see es Se oe is Ses eae eae ee ee RS RT 
Megson lie(esca eeae  Pea Sse ees hee ee 
GIR SAR a Tt i ea i en RO Bi i Ry iti ree age 30 
UT ek (eee a are ee eer ano matress Loar, wee 6 
LETS EN Sa Sa rere ee ie ee 9 
BBN) Cem) cp member eu a gl Aes ire ae oe sa ee Se ae 5 
RO EME DET Ope SES Bee oe see ee ee 2A 
The male died June 25 and the female July 7. These beetles were 
observed copulating March 23, 25, 26, 27, 81; April 1, 2, 4, 5, 6, 7, 
8, 10, 11, 12,13; 94, 26, 27, 28; May 7, 11, and 13. It 1s interesting 
to note that such frequent mating is not necessary to insure the 
fertility of the eggs. This is demonstrated by the following records: 
March 24 a female, with abdomen noticeably distended with eggs, 
was captured in the field and confined in a cage without a male. 
Eggs were deposited as follows: 
Hgags deposited. 
UB eas rete tag (eae eR DS Se es 2 ore eee 33 
SSP VET henge eg eS ot ge eee eRe aia ee See ORE 4 
Pa C1 SUS ae as oe SS or ae es Ne a econ gee eo ieee Pes AT sa, 3 
PATS Qt ko wane ne Me ae Gy Bobet ss ee 25 
