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 duodecim punctata 
Oliv.) occurs only in small numbers in southern Texas, and no com- 
plaints of injury were received concerning it. 
On February 5 four mature larve 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. 
Marilee aeons (3 ll] Wey OW) oas-cosene 38 
May lGss< cee =< ZON| |e ATC Le yee eretee alan 19 
Miaiyal Ol fer acini 635) |\unel6seresaece rer 20 
Maiy242 5 one-car G74 RUINS rere ieee (2) 
May 26 8se ne cts css 55 
May 27h ree seine 110 Totaluw eens 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. 
Miaiyinl Ae o/c Nate aoe te eerie 68 eges deposited. 
Mio 20) seek Ae st coker ete oe ety 68 eggs hatched. 
Mary soi 2 cyte 2 ele em Cane cree First larvee made cells. 
EIN G Are eere cepee e eeren eer First larvee pupated. 
ane s1'Q one Petes aes ne eaten First adults developed. 
Jum ey 2h erties ete ee ieee First adults issued from cells. 
June sae Se Care eine All adults had issued. 
The stages were as follows: 
Days. 
Hep stapes: 1... U2 ee oe sae See eee ee ee oe ee ere eee 6 
Larval stage. 3 252 n2 sei eee oS Ee ee Sra ee renee 15 
Pupal ‘stage’ 202.2552 ee ee ec a ent tate ee ee rere 6 
Totalecicic. ccig tn Ree Se Slee oe ee es Ses eer ee 27 
This species proved very hard to rear and only a small proportion 
of the larvee reached the pupal stage. The larve were placed in large 
jelly glasses and fed on sorghum cane. 
