THE CANADIAN ENTOMOLOGIST. 



115 



The Japanese Hop, H. japonicus, clearly an introduction, yet 

 escaped to some extent, is notoriously free from insect attack. 

 Where doubt may arise over the question of a plant being indi- 

 genous or not, some evidence should be adduced from its insect 

 associations. 



F 

 F 

 F 

 F 

 F 

 F 

 F 

 F 



g. 1- 

 g.2- 

 g.3- 

 g.4- 

 g-5- 

 g.6- 

 g-7- 

 g. 8- 

 g.9- 



EXPLANATION OF PlATE I. 



-Papaipema humuli, male. 

 -Papaipema humuli, female. 

 -Gall produced in Hop vine by larva. 

 -Papaipema humuli, larva, stage HI. 

 -Papaipema humuli, larva, last stage. 

 -Papaipema silphii, male. 

 -Papaipema silphii, female. 

 -Papaipema silphii, larva, last stage. 

 -Papaipema maritima, larva, last stage. 



INSECTS CAPTURED BY THE THOMISID.E:. 



BY JOHN H. LOVELL, WALDOBORO, MAINE. 



The Thomisidae, or crab spiders, have acquired the habit of 

 frequenting flowers for the purpose of preying on the insect visitors. 

 They usually lurk in thyrsoid or dense clusters of small flowers, 

 like the inflorescence of the sumac (Rhus), meadow sweet (Spircea 

 salicifolia) , elderberry (Sambucus), Viburnum, Cornus, and the 

 bristly sarsaparilla {Aralia hispida), although they are also found 

 on large individual flowers as the rose. The commonest species of 

 this family is Misumena vatia, a white spider wath a crimson stripe 

 on each, side of the abdomen (PI. H). It is quite common, but its 

 colour will often cause it to be overlooked until a dead insect is 

 noticed lying upon the surface of the inflorescence. Mr. J. H. 

 Emerton informs me that this species and also M. aletaria may be 

 either white or yellow, and the pink stripes on the sides of M. 

 vatia may be either present or absent. Another species (M. 



April, 1915 



