. An annotated list of the important North American forest insects. Forest insects. BULLETIN 1182, I'. S. OF AGRICULTURE. The size of the prepupa is discussed under "Larval ; The prepupa of Diprion simile is similar to the larA-a, in structure, with the armature or spines reduced to indistinctness. The head is gi-ayish white, eye disks and apices of mandibles, only, black. The thorax and abdomen are both pale greenish white, with narrow green, dorsal longitudinal stripes and broader green supraalar to alar longitudinal lines which are broken by yellowish spots on
. An annotated list of the important North American forest insects. Forest insects. BULLETIN 1182, I'. S. OF AGRICULTURE. The size of the prepupa is discussed under "Larval ; The prepupa of Diprion simile is similar to the larA-a, in structure, with the armature or spines reduced to indistinctness. The head is gi-ayish white, eye disks and apices of mandibles, only, black. The thorax and abdomen are both pale greenish white, with narrow green, dorsal longitudinal stripes and broader green supraalar to alar longitudinal lines which are broken by yellowish spots on B, C', C^, the pale spiracular area, and the yellowish alar area. Pleurum pale but for a pair of greenish pleural spots, ^'enter, uropods, postpedes, anus, and epiproct pale, the latter faintly graAash. COCOON. The cocoons (Fig. 5) of Diprion simile are cylindrical, with hemispherical ends. They are single-walled, of fine texture, rather glossy, fairly stiff, but tliin. Cocoons from wliich males emerge are somewhat smaller than those from wMch females issue, 7 by millimeters being the size of the former, while the latter are by 4 mili- meters. The cocoons are usually dark brown; sometimes they are pale tan when made but become dark brown within a week or 10 days, and in one instance a whitish cocoon was spun which failed to become colored. A^^V Ai^yAy ^U^^" Ci CM '^l- '-0 ^ !? ?i ^ ^ I ^ <'-•?. -^. ^ Oj ^J (\i c\j c\i ^<^ ^ '^ I. Fig. 4.—Diprion simile: Larval growth charts. Stage of larva indicated by large figures. Female has six stages, male five. Growth records are shown for a single female and a single male larva. In captivity the cocoons were often spun on the needles, and while this may be the rule in nature the "writer is inclined to believe that many of the prepupte of this species, like those of Neodiprion lecontei, will make their cocoons in the ground for the sake of the protection thus afforded in winter. This view is supported by a Euro
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
