78 DECIDUOUS FRUIT IXSECTS AXD INSECTICIDES. 



Table I. — Length of larval stage of the cherry fruit sawfiy, Suisun, Cal., 1910. 



Date. 



1910. 

 Mar. 25. . 

 Mar. 27.. 

 Mar. 30. . 

 Apr.l... 

 Apr. 6. . . 

 Apr. 8... 

 Apr. 12.. 

 Apr. 1G. . 

 Apr. 17.. 

 Apr. IS. . 

 Apr. 19. . 

 Apr. 20. . 



Observation. 



34 larvae hatched in cherry blossoms in cage. 



Supply of fresh food given (branches of young fruit from cherry tree). 



24 larvae had entered second cherry. 



6 more larvae had entered second cherry. 



Fresh food put into cage. 



16 larvae found in third cherry: 6 larvae still in second cherry. 



Fresh food put into cage. 



3 full-grown larvae left fruit. 



2 full-grown larvae left fruit. 

 5 full-grown larvae left fruit. 



Do. 



3 full-grown larvae left fruit and 5 full-grown larvae found in trash at bottom of cage, 

 larvae had left fruit at this date. 



All the 



When full grown (see fig. 23, c) the larva leaves the fruit and 

 works its way into the ground, where it constructs a small parchment- 

 like cocoon. The cocoon will be found from 3 to 7 inches below the 



surface, the depth 

 varying some- 

 what with the 

 texture of the soil. 

 It is elliptical or 

 oval in shape and 

 from one-fourth 

 t o three-eighths 

 of an inch long. 

 Inside the cocoon 

 is smooth, dark 

 brown in color, of 

 a papery texture, 

 and somewhat 

 brittle, especially 

 in dry soil, so that 

 it is easily broken. 

 The outer surface of the cocoon is covered with fine particles of soil, 

 giving it the appearance of a small clod of dirt. In Plate X, figure 2, 

 are shown full-grown larvae and cocoons, some of the latter being torn 

 partly open. 



The larva remains as such in the cocoon until the following winter. 

 Some time after the winter rains begin it transforms to pupa and 

 emerges the following March as adult. 



The pupa has not been observed. There is only one brood each 

 year. 



NATTJRAI, ENEMIES. 



Two parasites, an ichneumon and a microbracon (see fig. 24), were 

 obtained from the material collected by Mr. Braucher. 



Several large collections of infested fruit were brought to the 

 laboratory for possible parasites, but none was obtained from this 



Fig. 24. 



Microbracon sp., a hymenopterous parasite of the cherry fruit saw- 

 fly (Hoplocampa cookei). (Original.) 



