84 SOME INSECTS INJURIOUS TO’ TRUCK CROPS. 
as recorded at the local weather station, ranged from a minimum of 
60.9° F. to 94.4° F. 
Observation has not been carried far enough to enable the writer 
to state positively the number of generations in this region. 
OBSERVATIONS ON DIABROTICA DUODECIMPUNCTATA Oliv. 
The twelve-spotted cucumber beetle (Diabrotica duodecimpunctata 
Oliv.) occurs only in small numbers in southern Texas, and no com- 
plaints of injury were received concerning it. 
On February 5 four mature larvee were found feeding on the roots 
of sorghum at Harlingen, Tex. February 7 one of these made its 
cell; on the 15th it pupated, and on the 25th the adult developed. 
The other beetles developed a day or two later. 
On May 12-a female with greatly distended abdomen was placed in 
confinement and deposited eggs as follows: 
Record of egg deposition of a single female beetle of Diabrotica duodecimpunctata in con- 
finement May 12, 1909. 
Number Number 
1909. of eggs. 1909. of eggs. 
May 14o 332 Sa5es- 68} May, 29). 322 = a.m ae 38 
MiayalGis- senses 7D aun ellie = eae 19 
Maiyul QDs See ee Gon WUne Gssen eee ae 20 
May, 245 sjsisc- ace G7el PUNE |S sae eet (2) 
May 262222 cece 55 
Maid Teee es ieiece 110 Total s..ss- 515 
@ Beetle died. 
This gives a grand total of 515 eggs from one beetle. 
The record for the eggs which were deposited May 14 is as follows: 
Detailed record for the 68 eggs of Diabrotica duodecimpuncta’1 deposited May 14, 1909. 
Msivel ae ieet sed ao Atlee tek sete 68 eggs deposited. 
May 20. dette ellos alee e Paratecs Me 68 eggs hatched. 
Many Siew MeN eee: ake RCN HS First larvee made cells. 
Piast Oe ee ee ie BAe Ce Oa First larvee pupated. 
June dOsssesecee-ee see ee see First adults developed. 
AUG UO eee ey ee ee eee ee First adults issued from cells. 
ATA G5 1A eet ge a ee es yn All adults had issued. 
The stages were as follows: 
Days. 
Migr gtape cs Saat cccas sce etre re Sa ralar ec aie eee en ee ee ee 6 
Larval atagess cee So eis 5 2 a sis SS ee er 15 
Pupal'stage: sos ALE COS Cte LC tee ea ere 6 
Totallss. cs ted Be Saeco 27 
This species proved very hard to rear and only a small proportion 
of the larvee reached the pupal stage. The larvee were placed in large 
jelly glasses and fed on sorghum cane. 
O 
