844 CONNECTICUT EXPERIMENT STATION REPORT, I907-I908. 



larvae more abundant, but in spite of the fact that plenty of lime 

 was used, there was some injury to the plants, shown by many 

 leaves and tips of leaves becoming dry and dead a few days after 

 the treatment. The poison was applied with the Niagara gas 

 sprayer, covering four rows at once, as shown on Plate LVIII a. 

 This sprayer does not have a satisfactory arrangement for agitat- 

 ing the liquid, but in most other respects it is fairly satisfactory. 



The Three-Lined Leaf-Beetle on Potatoes. This insect was 

 more than usually abundant on potatoes and in some cases did 

 almost as much injury as the Colorado beetle, to which it is 

 closely related, both belonging to the family Chrysomelidw. The 

 three-lined leaf-beetle, Lema trilineata Oliv., is of a pale yellow 

 color, with three black longitudinal stripes on the back, and it 

 resembles the striped cucumber beetle, though larger. It deposits 

 yellow eggs in rows along the mid-rib on the under sides of 

 the leaves. The larvae are yellow and have the disgusting habit 

 of covering themselves with their own excrement. There are 

 two broods each year. The damage is similar to that caused by 

 the Colorado beetle and the same remedies are to be advised. 

 Latvae of the three-lined leaf beetle were brought to the station 

 on July I2th, with two other kinds of beetles which had been 

 observed feeding upon them in New Haven. The predaceous 

 beetles were Lebia grandis Hentz. and Pterostichus lucublandus 

 Say, both common species of the family Carabida. 



Leaf-Beetles Devouring Marsh Golden-Rod. During a collect- 

 ing trip to the Stratford marsh, July 21st, it was noticed that the 

 golden-rod (Solidago sempervirens) which grows in bunches 

 commonly about the marsh was being eaten up by insects. On 

 closer examination, two forms of injury were apparent and caused 

 by two different kinds of beetles of the family Chrysomelidce. The 

 larger, Trirhabda canadensis Kirby, is dull yellow, with three 

 blackish longitudinal stripes, and is about three-eighths of an 

 inch in length. It feeds upon this golden-rod in both the larval 

 and adult stages, and the plants were stripped of their topmost 

 leaves and tender shoots by this insect; The lower leaves were 

 less injured and were still green. In other clumps the leaves were 

 entirely brown, many of them being rolled and containing large 

 numbers of a beetle known as Microrophala vittata Fabr. This 



