ORIGIN AND DISTRIBUTION. 
15 
road track and collected both larval and adult forms of the bean 
thrips upon this plant. 
Mr. A. C. Morgan, of this bureau, recently reported to the writer 
that he had collected the species on October 10, 1910, at Clarksville, 
Tenn. The fact that this insect is so widely distributed in all parts 
of California seems to point strongly to that State as its original 
home. This is also strongly supported by the fact that Moulton 
collected it from wild vetch in the Santa Cruz Mountains and that 
the writer collected it in wild, uncultivated tracts in the mountains 
and canyons north of Los Angeles, 5 and 6 miles from cultivated 
crops. This point of view is further strengthened, because the au- 
thor has found this insect feeding on more than 20 native wild 
plants. 
Fig. 8. — Map showing present known distribution of the bean thrips (Heliothrips fasciatus) . 
(Original.) 
Mr. J. D. Hood, formerly of the office of the State entomologist 
of Illinois, recently informed the writer that he possessed specimens 
of this thrips that were collected by Prof. Lawrence Bruner at 
Lincoln, Nebr., February 11, 1899, and that he had collected this 
same species at Urbana, 111., in March, 1907. In both cases the 
thrips were taken on California oranges and had evidently been car- 
ried across the country while hibernating in the navel end of the 
fruit. This is an excellent illustration of how this insect may be 
distributed through the agency of man. 
Although this insect is quite minute and has been little studied, 
at the present time it is known to occur through the entire State of 
California, in several places in Arizona, in Nevada, and in Idaho 
near the Washington State line. It has also been found in one 
locality in Tennessee. Figure 8 has been prepared to show the 
present definite localities where this insect has been observed. 
