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INTERNATIONAL CONGRESS OF VITICULTURE 



Fig. 3. Adult beetle and work on young leaf (enlarged about twice). 



many long hairs. During the later stages the larva is lighter in appearance. 

 The color immediately after a moult is light yellow but soon changes to a 

 dark yellow with numerous dark areas which surround tubercules bearing 

 short setae. The dark areas near the median line join those opposite, thus 

 giving the appearance of dark transverse stripes. The length of the fully 

 developed larvae vary from 7 to 9 m.m. (.276 to .354 inch). 



Pupa. The body of the pupa is yellow with the wings and legs almost 

 white. They are from 4 to 6 m.m. (.16 to .24 inch) in length. 



Adult. The beetles are about 5 m.m. (.2 inch) in length and of a shining 

 steel-blue color. The color varies with individuals from a purple to a 

 metallic green. The body and elytra are such as to give the insect a rather 

 stout appearance. The femora of the hind legs are very much thickened by 

 the presence of large muscles which give the capacity for jumping a very 

 common habit of these beetles to escape danger. The lively habits and the 

 bright color of these adults distinguish them from other pests of the vine. 



Seasonal History. 



Hibernation. During the late summer and autumn the grapevine flea- 

 beetles are rather sluggish and retire to the woodland as described above. 

 They seek hibernating places under the rough bark of trees, in the crevices 



