Bulletin of the of Agriculture . he vertex along thedorsum to the abdomen, after which the insect becomes very active,doubling down with the head between the fore feet and slowly re-moving the skin from the head and antennas. The legs are thenworked out of their casings and the exuvium pushed back under thebody. The skin usually is attached at the tip of the abdomen to thesurface on which molting occurs, greatly aiding the insect in ex-tricating itself. The skin generally is removed entire, but occa-sionally antennal and leg casings are removed separately. Coolweather greatly ret
Bulletin of the of Agriculture . he vertex along thedorsum to the abdomen, after which the insect becomes very active,doubling down with the head between the fore feet and slowly re-moving the skin from the head and antennas. The legs are thenworked out of their casings and the exuvium pushed back under thebody. The skin usually is attached at the tip of the abdomen to thesurface on which molting occurs, greatly aiding the insect in ex-tricating itself. The skin generally is removed entire, but occa-sionally antennal and leg casings are removed separately. Coolweather greatly retards the process, which is more likely to be ob-served when such weather prevails. Groups of larval skins re-sembling specks of gray dust sometimes are found on orange molting process in the citrus thrips is similar to that observedin certain Orthoptera. THE PUPA. DESCRIPTION. The propupa.—The propupa, or first instar (fig. 6), is very similarin general appearance to the larva. It is generally somewhat paler THE OITEUS THRIPS. 15. in color. The antennae are directed forward and are 4-jointed. Theeyes, at first almost colorless, finally show a red pigmentation in abouttwo-thirds of the facets. The wing pads, which are almost colorless,transparent saclike projections, the hind pair pro-jecting slightly farther than the fore pair, extendto or slightly beyond the hind margin of the secondabdominal segment at the beginning of this in-star and reach to the hind margin of the thirdsegment before transformation to the second-instarpupa. The second-imtar pupa.—The second-instar pupa(fig. 7) is at first but slightly larger than theadvanced propupa. The color is pale, translucentyellowish. The antennas are apparently 4-jointed,but the exact number of joints is confused by theringed appearance due to transitional tissues seenthrough the pupal sheath. They are directedbackward over the head and prothorax, extendingto a point near the middle of the latter. All facetsof the eye
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
