4 BULLETIN: 778, U. S. DEPARTMENT OF AGRICULTURE. 
greatly produced, with a length about five times its diameter. Ovipositor nearly 
as long as the abdomen, the terminal lobes narrowly oval, tapering. Other 
characters presumably as in the opposite sex. ‘ 
LIFE HISTORY. 
The female midge, with her long ovipositor, places small yellowish 
eggs just under the sepals of the flower buds or between the folded 
leaves of the leaf buds. Under favorable temperature conditions 
these eggs hatch in 2 days, and the young larve or maggots immedi- 
ately attack the buds, extracting the sap and eventually causing the 
petals and leaves to dry up and die. (Fig. 2.) They grow very 
rapidly, reaching maturity in from 5 to 7 days, and, when full 
grown, work their way out of the buds and fall on and enter the 
ground where they construct small silken cocoons (fig. 1, D) in which 
they pupate. Adults appear in from 5 to 7 days, and shortly after 
deposit eggs for the next generation of larve or maggots. In con- 
finement the life of an adult is from 1 to 2 days. The total cycle, 
therefore, under greenhouse conditions, is from 12 to 16 days. About 
85 per cent of the adults reared in cages were females. 
SEASONAL HISTORY. 
Although larve or maggots have been observed injuring buds as 
early as February 22, under normal conditions they do not appear in 
injurious numbers until June or July. In Washington adults were 
reared in early May from larve which pupated in November. Dur- 
ing the warm summer months the generations may mature every two 
weeks, and overlapping of broods probably takes place. Larve were 
especially injurious at Colgate, Md., during two periods of the year, 
namely, from the latter part of May to early July and from early — 
September to November 1. On the approach of cold weather the 
stages are slightly prolonged, and about the latter part of November 
the larve enter the ground and construct overwintering cocoons. No 
injury has been reported during winter. 
FOOD PLANTS. 
Roses, especially the hybrid teas, are apparently the only plants 
attacked by this insect. It has been recorded as infesting the Radi- 
ance, Hadley, Russell, Killarney, Ophelia, Hoosier Beauty, Shawyer, 
My Lady, American Beauty, Uncle John, Joe Hill, Kate Moulton, 
Bridesmaid, Liberty, Richmond, Mrs. John Laing, Meteor, Madam 
Chatenay, Ivory, Golden Gate, Wooten, La France, and a sport of the 
latter, the Duchess of Albany. 
EXPERIMENTS IN CONTROL. 
At the suggestion of Prof. E. N. Cory a series of experiments, in 
which the following combinations were used as sprays, was conducted 
to determine the value of molasses in catching the larve, thus pre- 
