234 Ageioultukal Experiment Station, Ithaoa, N. Y. 



insect. Nearly ever writer in speaking of the lighter stripes between 

 the prominent blask ones describe them as bright lemon yellow in color; 

 and no mention is made that they were ever any other color. But, as Dr. 

 Fitch pointed out, they are of a bright apple green color in life. Only one 

 specimen out of the many hundreds observed this season on the current 

 bushes had these stripes yellow in life. Occasionally the stripes retain 

 their green color for several months after being placed in cabinets, but 

 usually the change takes place in a few weeks, especially if the speci- 

 mens are kept in the light. 



The black spots caudad of the outer black stripes on the wing covers 

 are often wanting or nearly so. Among 75 specimens collected this 

 season, 29 of them, mostly females, lack the spots. Thirteen of the 

 specimens, mostly females, showed but little trace of the outer black 

 stripes on the thorax; in some specimens both the stripes and spots 

 were wanting. The black bands on the dorsel aspect of the femurs are 

 sometimes obsolete, CBpecially on the front legs. 



Dr. Fitch says the females are much more numerous than the males. 

 Among the 76 specimens mentioned above, 44 are females, and in the 

 field this year there seemed to be nearly as many males as females. 



Habits of the nymphs. — The nymphs confine their attacks to the 

 tenderest opening leaves. Their mouth parts are formed into a little 

 beak which, when not in use, extends along the venter close to the body, 

 reaching nearly to the second pair of legs. In feeding, which occupies 

 most of their time, this little beak is placed against the surface of the 

 leaf and four thread-like organs working in a groove in the beak are 

 forced into the tissues. The green pulp or parenchyma of the leaves 

 is literally pumped or sucked through the beak into the body. When 

 the beak is once inserted, the sucking is continued until nearly all the 

 parenchyma has been taken from a round or angular area bounded by 

 the minute veinlets of the leaf and about the size of a common pin's 

 head. This makes a semi-transparent darkish spot on the leaf which 

 turns brown in a day or two owing to the death of the outer or epider- 

 mal layers of the leaf. The spots are then quite conspicuous from 

 either aide of the leaf, although the nymphs work mostly from the 

 under side. Figure 2 is a reproduction from a photograph of a currant 

 leaf and shows fairly well the characteristic appearance of the work of 

 the insect. The spots are not as distinct as they occur in nature for 

 the difference in coloring between the spots and the rest of the leaf 

 could not be brought out by pliotography. As the nymphs increase in 

 size the spots are a little larger and more numerous until not only 

 hundreds occur on a single leaf, but often nearly all the parenchyma is 

 taken from the leaf. 



