. Biennial report of the Oregon State Board of Horticulture ... Horticulture -- Oregon; Fruit-culture -- Oregon; Gardening -- Oregon. Fig. 21 — Larva of tiiird series, just born from wing- less and agamic female of second series; enlarged. The third stage does not differ, except in size, from the second, though now, as usual, the developing embryos become visible through the body wall. In the fourth stage the antenna^ are six-jointed, the single sensory pit being at the tip of the fifth joint. The honey •tubes are as long as two body segments, and taper a little toward the tip, which is somewh
. Biennial report of the Oregon State Board of Horticulture ... Horticulture -- Oregon; Fruit-culture -- Oregon; Gardening -- Oregon. Fig. 21 — Larva of tiiird series, just born from wing- less and agamic female of second series; enlarged. The third stage does not differ, except in size, from the second, though now, as usual, the developing embryos become visible through the body wall. In the fourth stage the antenna^ are six-jointed, the single sensory pit being at the tip of the fifth joint. The honey •tubes are as long as two body segments, and taper a little toward the tip, which is somewhat flared. In this stage there is no very obvious difference when compared with the same stage from the wingless form. It is to be noted that none of the descendants of these winged forms showed any traces of forming wing-pads, but I am not prepared to say that none are now developed. To avoid all chance of getting examples of the second series, descendants of the wingless viviparous forms, that began to mature May 12, were not examined until May 17. These larvae have stout honey tubes about equal to a body segment in length, four-jointed antennse without sensory pits, and in other particulars resemble the previous series. In the second stage the honey tubes are a little longer, the antennge are five-jointed, yet without sensory pits, and the form is a long oval. The third stage shows the usual increase in size, and in the fourth stage the antennae are six-jointed, resembling the descendants of the winged form, except that there is no sensory pit in the fifth antennal joint. ,Iuoe 0, a new series of winged forms was making its appearance, and there was a very general occurrence of a third series of wingless parthenogenetic, viviparous females. This type has been present for some days, but I preferred making certain of its being actually distinct before mounting specimens. Matters were now becoming very decidedly mixed, and while the second series of wing- less forms were al
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