82 



jury. It was observed that many of the leaves bore numerous trichomes 

 on the under surface at the proximal portion of the laminae where the 

 veins converge toward the petiole. 



Large numbers of mites, identified as Eriophyes sp(?),* were 

 seen to crawl from beneath and among the trichomes when the point of 

 a teasing needle was drawn through these regions. When the mites are 

 thus disturbed they crawl rapidly over the under surface of the leaf, oi- 



FiR. 4. Eriophyes intis frnm Banks, in "The Acarina or Mites." It is hero repro- 

 duced to indicate the jreneric character of the maple mites rather than the specific 

 characters. 



stand on end and, attached by the caudal adhesive disk, sway the anterior 

 end of the body in a circle; ethers seem to make a leap, and disappear 

 from sight. No effort was made to determine the relative number on 

 each infested leaf, but it was estimated to be a hundred or more for 

 the many leaves that were examined. 



During the cccler hours of the morning the mites were to be found 



* The author has not found it possible to procure satisfactory material for drawings, 

 since his interruption in the obseivations, therefore, a drawintr of Eriophyes vitis by 

 Banks (in Report No. 108, Contributions from the Buieau of Entomology, U. S. Dept. 

 Agr., Washington, D. C, 191.5, on "The Acarina or Mites"), is introduced to indicate 

 the character of the mites, rather than the species, which infest the Norway maple. 



