36 THE BEAN THEIPS. 
TOTAL LIFE CYCLE. 
For localities with climatic conditions similar to those of Compton, 
the life cycle of this thrips will occupy during the early spring about 
51 to oQ days, taking 20 days for the egg incubation, 17 to 19 days 
for the larval development, and 1-1 to 17 days for the prepupal and 
pupal stages. 
During the months of June to October the life cycle of this thrips 
will occupy from 28 to 43 days, taking 13 to 18 days for the egg 
stage. 10 to 14 days for the larval stage, and 5 to 11 days for the 
prepupal and pupal stages. 
During the rest of the breeding activity the life cycle must be even 
longer than in the spring, as in November, 1910, the prepupal and 
pupal stages alone occupied from 28 to 33 days, so that for the de- 
A'elopment of this insect during October, Xovember, and the first of 
December at least 68 to 73 days must be required. 
EMERGENCE FROM HIBERNATION. 
In 1912 the adults began to emerge from hibernation at Holly- 
wood, Cal.. in January, and began oviposition at once. TVTien this 
locality was visited on February 7, the adults were found to be feed- 
ing on the foliage of peas and beans in some numbers. They were 
also seen in copulation in many cases. A careful examination dis- 
closed 4 young larva? feeding on bean foliage, so that the adult must 
have laid the eggs at least by January 10. This field was situated 
on the foothills of what is termed a frostless belt, and it may be that 
tliis insect in mild winters might breed there during the entire 
period. 
On February 17 adults were found feeding on pea foliage in Mis- 
sion Valley, San Diego County, but no young were seen. February 
23 the species was found as an adult feeding on pea vines in the truck 
farms around Los Angeles, and on March 13 adults were found feed- 
ing in small numbers at Compton, Cal. From then on the adults were 
common feeding on different plants, but not until April 17 were the 
larvae found feeding in the open at Compton. although they were 
being reared in the open insectary at that place from material col- 
lected at Hollywood. 
It would probably be better to say that this insect begins active 
reproduction at a varying time, those in the most protected places 
starting as early as January 10. and the others over the next 60 days. 
However, during the early spring the multiplication and spread 
seem to be very slow. 
ENTRANCE INTO HIBERNATION. 
As the month of October appears, the adults become sluggish, do 
less feeding and lay fewer eggs, and apparently many enter hiberna- 
