. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 78 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. Table I.—Length of larval stage of the cherry fruit sawfly, Suisun, Col., 1910. Date. Observation. 1910. Mar. Mar. Mar. Apr. Apr. Apr. Apr. Apr. Apr. Apr. Apr. Apr. 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. 10 larvae found in third ch
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 78 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. Table I.—Length of larval stage of the cherry fruit sawfly, Suisun, Col., 1910. Date. Observation. 1910. Mar. Mar. Mar. Apr. Apr. Apr. Apr. Apr. Apr. Apr. Apr. Apr. 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. 10 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. NATURAL ENEMIES. Two parasites, an ichneumon and a rnicrobracon (see fig. 24), were obtained from the material collected by Mr. Br
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