1924 



ENTOMOLOGICAL SOCIETY 



13 



general nature of its work. While there is little justification for this, it might 

 perhaps be explained by the fact that the adult Curculio is not readily seen unless 

 one is careful when approaching rosebushes. If the bushes are shaken at all, 

 the beetle, which is easily alarmed, will let go and fall to the ground. The adult is 

 conspicuously marked, as its name would suggest, and may be observed, if some 

 caution be taken, resting upon the foliage or at work devouring the buds. Once 

 seen, there is, of course, no likelihood of associating the prominently beaked 

 Curculionid with the above-named Scarabaeid, which, moreover, is not found 

 on the Canadian prairies. 



It is usually the depredations and seldom the insects themselves which first 

 attract the attention of rose-growers, and for the most part the destruction of 

 rose blossoms goes forward unchecked, so elusive and yet persistent are the 



Dipterous larva in rose hip. 



Larva, R. tricolor, showing position in hip. 



Fully developed larva, Rhyncites bicolor. 



Rose hip, showing emergence hole of larva of 

 R. bicolor. 



attacks of the little invaders. Experiments, however, have shown us that a 

 very appreciable control may be realized by combating either the early larval 

 or adult forms. 



Life Cycle. The life cycle of R. bicolor as it occurs in Manitoba may be 

 summarized by the following dates: 



Adult emergence June 1 



Egg-laying June 14 



Hatching. July 8 



Desertion of hips Sept. 4 



Pupation May 16 



