THE CHEERY FRUIT SAWFLY. 



75 



for the Bureau of Entomology, kept a close watch for the first appear- 

 ance of the adults of this species. On March 10, 1910, he found three 

 female sawflies (see fig. 23, d) in cages planted under trees in the 

 orchard and used for the emergence records of the pear thrips. 

 Four more adults were caught in the cages on March 12, and two 

 dead ones were found outside of the cages. These had evidently 

 been killed by the spraying for thrips the previous morning. The 

 first males were found March 16 and after this date both sexes were 

 quite numerous for some two weeks or more. The Black Tartarian 

 cherries were just beginning to bloom at this time. 



The writer spent considerable time in the Suisun section at this 

 period, making a further study of the life history and habits of the 



Fig. 23.— Stages and work of the cherry fruit sawfly (Hoplocampa cookei): a, Egg; b, position of egg in 

 cherry blossom; c, larva; d, adult sawfly; e, saw of ovipositor; /, serrations on ovipositor; g, sheath of 

 saw; Ji, head of adult sawfly; i, infested cherries. (Original.) 



insect. By March 20 adults of both sexes were plentiful, but the 

 females far outnumbered the males. As many as 40 individuals 

 were observed in one tree, two-thirds to three-fourths of which were 

 females. The adults were very sluggish in the early mornings and 

 could be picked up with little or no difficulty. Toward noon, as the 

 atmosphere grew warmer, they became more active, but even then 

 many individuals could be caught in the trees. The adults may be 

 found resting on the leaves, leaf stems, blossoms, both outside and 

 inside, and on the twigs. A few were observed feeding on the nectar 

 of the more advanced flowers. In confinement the adults fed quite 

 freely upon sirup and water. 



