SPRING AND SUMMER NUMBERS 55 
ceeds much more slowly during the entire winter. There is not 
a month of the year, however, during which breeding is entirely 
suspended. After a warm spell in even January one can find 
at least a few young in roses and other favorite flowers. They 
do not hibernate, but are equiescent during the coldest weather. 
Further north thrips hibernate in either the adult, egg, or larval 
stages. 
Parthenogenesis is common. Indeed in many species no males 
have ever been seen. 
ENEMIES. Thrips seem to be exceptionally free of predaceous 
enemies. They are apparently too insignificant to figure in the 
commissary arrangements of other animals. An internal para- 
site has been recorded, a hymenopteron, but it is not common. 
A fungus disease or two have been observed, and a small bug 
Triphleps insidiosus, feeds on them. But the chief factor in 
keeping down their numbers is heavy dashing rain, which beats 
them from the plants and pounds them to death on the ground. 
This order of insects has been but little studied by resident 
entomologists of Florida. Mr. A. C. Morgan of the U. S. Bureau 
of Entomology, has done considerable collecting in the State, 
aided by Mr. Runner, and has described several species. Mr. 
J. D. Hood of the U. S. Biological Survey, has described several 
Florida species. 
Prof. A. L. Quaintance and the late H. M. Russell, both of the 
Bureau of Entomology, have studied some species of economic 
importance. The writer has collected in this group only inci- 
dentally while working on some species injurious to plants of 
economic importance. The present list includes all the species 
the writer has collected in the State with the exception of two 
or three apparently new species of which he has not as yet 
_ been able to collect sufficient material for description. There 
has also been included in this list all the species that have been 
listed by other collectors as taken in the State. Many of these 
specimens the writer has not seen, and he assumes no respon- 
sibility for the correctness of their identification. But as they 
have all been listed by careful workers, they are doubtless mostly 
correctly identified. Those records that have thus been compiled 
from the publications of others are indicated in the text with 
the name of the collector and a reference to the publication in 
which the collections were recorded. When the name of the col- 
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