326 



REPORT OF STATE BOARD OF HORTICULTURE. 



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 almost gone, some yet remained, and from 

 them were born plenty of larvae that corresponded in age with those from 



Fig. 22-Second stage 

 of larve of third 

 series ; enlarged. 



Fig. 23 — Fourth stage of 

 larva of third series ; en- 

 larged. 



Fig. "24 — Wingless, partheno- 

 genetic, viviparous female 

 of the third series; sensory 

 pits of the antenna yet 

 further enlarged. 



