Entomological Xotes. 



319 



(seen in Fig. 14 at 4, 5, 6 and Fig. 16) are formed on the threads. 

 They are at first yellowish and afterwards black. These black 

 bodies are hollow, and contain a number of sacs (seen in the cen- 

 ter of figure 14 and Fig. 17), in which are spores which may be 



said to correspond to the winter spores of the 

 black knot. These black bodies have attached 

 to them a number of peculiar threads or ap- 

 pendages, which are rolled up at the end 

 Fig. 17. from which the name Uncinula is derived. 



Fig. 18. Peronospora Viticola. 

 The s-econd form of blight which occurs on grapes begins to 

 appear about the same time as the first, and may be mixed with 

 it on the leaf; or more, frequently it occurs alone. The first form 

 of blight may be found on either side of the leaf. The second 

 occurs only on the under surface and appears when fresh like 

 frost work. Theleaf stalks are sometimes covered by the fungus, 

 but it does not attack the grapes themselves. An examination of 

 the frost-like spots on the under surface shows that they consist 



