314 ALICE M. BORING AND RAYMOND H. FOGLER. 



and partly 14 (Fig. 8) chromosomes. The chromosome number 

 is specific, as the reduced number is 15, while only 12 are found 

 in Phil&nus spumarius. But the roundness of the odd chro- 

 mosome throughout the spireme stages is a feature common to 

 both species of this genus, and distinguishing it from the species 

 of the genus Aphrophora. 



Aphrophora parallela has 15 chromosomes as reduced number, 

 with one largest chromosome (Fig. n). The odd chromosome 

 is elongated in the early spireme stages (Fig. 9) and becomes more 

 nearly round in the later stages (Fig. 10). The odd chromosome 

 is, as usual, univalent (Fig. 12) and does not divide in the first 

 spermatocyte division (Fig. 13). The chromosome number in 

 the second spermatocytes is 14 and 15 (Figs. 14 and 15). Again 

 in this species, the chromosome number is different from that in 

 the other species of the same genus, that is, 15, in comparison 

 with 14 in Aphrophora quadrinotata and 12 in Aphrophora spu- 

 maria. The long odd chromosome in the early spireme stages 

 is a common feature of both A. spumarius and A. parallela, and 

 distinguishes them from the genera Philcemis and Clastoptera. 

 The early spireme stages of A. quadrinotata were not studied. 

 The species formerly classified as A . quadrangularis has since been 

 put into the genus Lepyronia. This species does not possess 

 the long odd chromosome characteristic of the genus Aphrophora. 



Clastoptera proteus has 7 as reduced chromosome number (Fig. 

 1 6), one less than the reduced number in Clastoptera obtusa. 

 Unfortunately only a few stages were found in this material, so 



TABLE I. 



Genus. Species. Reduced Chromosome 



Number. 



Philaenus spumarius 12 



" lineatus i S 



Aphrophora spumaria 12 



quadrinotata 14 



parallela 15 



Lepyronia quadrangularis 1 1 



Clastoptera proteus 7 



obtusa 8 



that the only other significant point that was observed was that 

 the first spermatocyte division is the one in which the odd chro- 

 mosome does not divide (Fig. 17) as in all the species of this family. 



