Doering: Lepyronia quadrangularis. 565 



tion of tlie division of tlie eighth sternum in the adult is shown ])y 

 the division of the nyniphal integument. 



From the foi-egoing studies it appears that the male and female 

 genitalia are not strictly homologous, since the three pairs of valves 

 in the male arise from a genital area on the ninth segment, while in 

 the female one pair comes from the eighth and two from the ninth. 

 This agrees with Kornhauser's (1919) work on a membracid and 

 Hackman's (1923) work on a cicadellid. Kershaw and Muir (1922) 

 in their studies of a cercopid, Philcenus leucophthalmus, make the 

 statement that the gonopophyses of the male arise in exactly the 

 same place as in the female. This conclusion appears to be drawn 

 from a study of the fourth and fifth instars only, which are not 

 sufficient to give a true interpretation of the origin of these organs. 



