202 



THYSANOPTERA AND ORTHOPTERA. 



length of the spikes was examined, first on one side and then on the 

 opposite. A strip about four buds wide thus remained undisturbed 

 on each side between the rows counted. It seemed scarcely probable 

 that insects as sluggish as Anthothrips verhasci would crawl past these 

 four buds when disturbed, and be counted again on the other side; but 

 to insure that no error was in this way introduced into the total result, 

 sometimes the leeward side was counted first, sometimes the wind- 

 ward. The results appear in Table V. 



TABLE V. — Showing the number of individuals of Anthothrips verbasci taken on 

 the leeward and on the windward side of spikes of mullein {Verbascum 

 thapsus) during or shortly after a rain. 



No. of 

 spike. 



Number of thrips. o- , , , Time elapsing after 



Leeward side. Windward side. "" fi ^t* * ^^^^ before count 



Young. Adult. Young. Adult. ' was made. 



6. 

 18. 

 152. 

 34. 

 15. 

 12. 

 16. 



4. 

 12. 



8. 

 46. 



. 0. 

 . 4. 

 .24. 

 . 7. 



14. 

 ,11. 



11. 



2. 



0. 



. 0. 



10. 



4. 



5. 



129. 



31. 



10. 



10. 



8. 



7. 



2. 



3. 

 30. 



. 0. 

 . 0. 

 .52. 

 . 4. 

 .10. 

 . 3. 

 . 6. 

 . 0. 

 . 0. 

 . 0. 

 . 3. 



Leeward . . 

 Windward . 

 Leeward . . 

 Windward . 

 Windward . 

 Leeward . . 

 Windward . 

 Leeward . . 

 Windward . 

 Leeward . . 

 Windward . 



During rain. 

 During rain. 



3 hours. 



4 hours. 

 2 hours. 

 2 hours. 

 2 hours. 

 During rain. 

 During rain. 

 During rain. 

 During rain. 



Total 323 



Total ex- 

 clusive of 

 3 and 4... 137 



83 



52 



239 



79 



78 



A count of thrips was made in like manner at times not closely fol- 

 lowing a rain. The spikes were dry, and the times were so chosen that 

 they must have been dry at least several days before the counts were 

 made. One set of counts was made with reference to the direction of 

 wind. The results are given in Table VI. 



TABLE VI. — Showing number of individuals of Anthothrips verbasci taken on 

 the windward and the leeward sides of spikes of mullein (Verbascum thap- 

 sus) during dry weather. 



No. of spike. 



No. of thrips on 

 windward side. 

 Young Adult. 



No. of thrips on 



leeward side. 



Young. Adult. 



19. 

 135. 



•Total... 162 



24 



152 



18 



