
Stake = 
:: Laboratory at West Lafayette, Ind., moved to Lafayette.—-The field 
laboratory of the Division of Cereal and Forage Insects, formerly located 
at S00 University St., West Lafayette, Ind., was moved on October 4 to 
the new Post Office Building, 4th and Forryists..,.Lalayet tojedindi, Geis 
Packard is in charge. 
Effect of low temperatures on reproduction of the pea (alfalfa) 
aphid.--"In the rearing cages in the insectary the effect of the low tem 
peratures reduced markedly the number of young Illinoia pisi Kalt. born 
each day and the length of time between birth and maturity," accord— 
ing to S. J. Snow, of Fallen, Nev. "With a mean temperature for the month 
of 50.5° F. the average number of young per day was 1.4 for wingless 
forms and 0.8 for winged forms. In September, with a mean temperature of 
64.7° F. for the last half of the month, the number was double this-—-3.3 
per day for wingless and 1.6 for winged forms. A few specimens were car-— 
ried through from birth to the time of reproduction in late September 
and early October with an average of 13.3 days for wingless and 15 days 
for winged forms. For the balance of October, including specimens which 
were started later in September, the length of this maturing period 
was 19.6 days for wingless and 21.4 days for winged forms." 
COTTON INSECTS 
Biology of fourth brood of pink bollworm at Presidio, Tex.--Biolo- 
and assistants have been conducting at Presidio, gave the following re- 
sults in October: "The average longevity for fourth-brood females in 
Squares was 12.4 days and for males 9.5 days at mean temperatures of 
74.0° and 74.6° F., respectively. The average number of eggs laid by 
females of this brood depositing fertile eggs was 74.7, and the maximum 
for a single female, 129. Eighty per cent of the females under 
observation laid fertile eggs. Records on egg fertility during October 
revealed that 75.3 per cent hatched. At mean temperatures ranging from 
73.9° to 65.9° F, the mean incubation period for any egg mass ranged from 
6.8 to 11.6 days. Collections of recently opened bolls on October 4, 14, 
and 24 showed them to contain 457, 525, and 514 fourth-instar larvae, 
respectively, per 100 bolls. Examination of 100 blooms on October 25 
showed them to contain 44 fourth-instar and 31 third—instar larvae." 
