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THE AMERICAN NATURALIST [Vol. XLVIII 



paper; but being here at liberty to fly, she soon inter- 

 rupted the experiment. 



Numerous other females were tried, and all showed 

 positive geotropism, some more promptly than others, 

 but all perfectly definitely. A single male tested showed 

 no definite reaction to gravity. A larva, nearly full 

 grown, subjected to the same tests, showed as definite a 

 positive reaction to gravity as did any of the females. 



"With the possible exception of the males, therefore, 

 Anaphothrips striatus is decidedly positive to gravity. 



Anthothrips verbasci 



Light. Exp. 4. — Adults of this species, shaken out on 

 a paper near a window, crawled in various directions. 

 None of them showed any definite reaction to light. 



Numerous larvae, none of them over three fourths 

 grown, crawled directly away from the window in every 

 instance. 



Exp. 12. — In this experiment adults from concealed 

 places in mullein spikes were compared with those from 

 exposed situations. They were shaken out on a sheet of 

 paper near a window, and the direction of crawling noted. 

 In every case, those from concealed situations showed a 

 fairly definite negative reaction to light. Of those from 

 exposed situations, two were plainly negative, the re- 

 maining ten indifferent to light. 



Exp. 11. — Larvae taken from concealment in a mullein 

 spike were tested, on a sheet of paper, for their reaction 

 to light. Those of the smaller sizes crawled directly away 

 from the window. Those nearly full grown, while on the 

 whole negative, crawled in a more or less devious path 

 away from the window. One reddish larva, which from 

 its color and size must have been nearly ready to pupate, 

 was especially indefinite in its reaction to light. 



Contact. Exp. 18. — Larvae of various sizes, which were 

 found to be negative to light, were placed on a blotter 

 under a square of glass supported at one edge, as de- 

 scribed for Anaphothrips striatus. When, in crawling 



