498 Alice M. Boring 



II and 10 second spermatocyte chromosomes (Figs. 238 and 239). 

 The odd chromosome can be traced as an individual as far back as 

 the contraction stage (Figs. 233, v, and 234, x). A plasmosome (/>) 

 also appears in the growth period, the thionin clearly bringing out 

 the difference between the two. One of the 1 1 chromosomes is 

 larger than the others, as is shown in Figs. 235, 238, 239. The odd 

 chromosome does not divide in the first spermatocyte division 

 (Figs. 236 and 237). The spermatids all contain a chromatin nucle- 

 olus (Fig. 242). A few stages of an individual with 12 chromo- 

 somes are shown in Figs. 243 to 248. This series much more nearly 

 resembles that of the other form from Cold Spring Harbor with 11 

 chromosomes, than that of the form found in Maine with 12 chro- 

 mosomes. The Maine form has no contraction stage (Stevens 

 '06b, Figs. 240 to 249), while this form has a distinct one with the 

 odd chromosome and the plasmosome outside of the spireme in 

 the clear part of the nucleus (Fig. 243). The only possible con- 

 clusion seems to be that three species (so determined by the differ- 

 ences in spermatogenesis) have been up to this time grouped as 

 one, and all called Aphrophora quadrangularis. 



Aphrophora 4-notata 



Aphrophora 4-notata is interesting especially in connection 

 with Aphrophora quadrangularis, as being another case of differ- 

 ence of chromosome number within the same genus. Aphrophora 

 4-notata has 14 chromosomes for the reduced number (Fig. 250) 

 and consequently 14 in half of the second spermatocytes (Fig. 253) 

 and 13 in the other half (Fig. 254). The odd chromosome is pres- 

 ent in the spireme stage (Fig. 249), and does not divide in the 

 first spermatocyte division (Figs. 251 and 252). 



Fidporidie 



The testes of the Fulgorid^e are orange-colored and show 

 through the thin white w^alls of the abdomen. The separate folli- 

 cles are oblong. Of the four species in my material, three belong 

 to the genus Poeciloptera, and one to the Amphiscepa, but according 

 to the spermatogenesis, P. bivittata is much more like theAmphis- 



