HABITS OF THE ADULT. 17 
Idaho, who collected it in a diseased spot of a crab apple. On August 
27, 1908, Mr. I. J. Condit sent in specimens of this thrips from 
Davis, Cal., where they were injuring sugar beets. He wrote: 
I examined the beets and found them literally covered with thrips, both the 
surface and underside of the leaves being badly infested. There were very 
few leaves which were not attacked, most of them having the appearance of 
the specimens sent. A field of tomatoes near by was also becoming infested. 
The lower leaves especially were yellow and some falling off. 
Mr. S. W. Foster informed the writer that on August 26, 1909, 
Mr. Frank T. Swett, of Martinez, Cal., sent to the laboratory of 
the Bureau of Entomology at Walnut Creek, Cal., a quantity of 
pear leaves badly injured by this species. On August 31 Mr. Foster 
visited the orchard and found the injury quite noticeable. He wrote 
that " the foliage gave the appearance from a distance of having 
been scalded." Mr. V. L. Wildermuth, of this bureau, sent speci- 
mens taken on alfalfa at Indio, Cal., on July 2, 1910. Mr. A. 
McLachlan, of Davis, Cal., sent in specimens of this thrips on 
October 13, 1910, with the report that they were injuring the buds 
and tips of cotton. 
Mr. W. B. Parker, of this bureau, under date of August 25, 1911, 
sent this insect from Davis, Cal., with the statement that it was 
causing serious damage to the foilage of the sugar beet. He also 
collected it on sugar beets at Hamilton City, Cal., on September 18, 
1911, where it was causing some injury. He wrote, however, that 
owing to the lateness of the season when the beets were attacked 
probably only slight damage resulted. 
HABITS OF THE ADULT. 
For a short time after emerging from the pupa this insect remains 
quiet and appears to be waiting for its' limbs to harden. During 
this time the colors, which were light at emergence, gradually darken. 
After hardening the thrips moves off and begins feeding. 
METHOD OF MATING. 
The males and females of this species seem to emerge from the 
pupa at about the same time. During this investigation it was ob- 
served that, under laboratory conditions at least, the sexes mated 
generally in from two to three days after emergence and in some 
cases in even less time. This operation has been observed both in 
the field and in the laboratory and was identical under both condi- 
tions. This is probably best described by the original field notes 
made at the time of observation. 
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