ANNALS 



OF 



The Entomological Society of America 



Volume XV SEPTEMBER. 1922 Number 3 



THE GENITALIA OF THE AUCHENORHYNCHOUS 

 HOMOPTERA. 



By J. C. Kershaw and F. MuiR. 



Most students of insect morphology consider that the 

 male and female genitalia of insects are homologous, but it 

 is also considered that in some groups of insects the female 

 genital opening, or gonopore, is situated between the eighth 

 and ninth abdominal sternites and the male gonopore between 

 the ninth and tenth. So far as the Hemiptera are concerned 

 these two views have never been reconciled, and the fact that 

 the gonapophyses of the two sexes appear to pertain to different 

 segments has been ignored, or used as an argument against the 

 organs being homologous. 



Observations made by one of the authors in England upon 

 Cercopidae and by the other in Honolulu upon Cicadellidae 

 and Fulgoroidea, agree in showing that the difference is only 

 apparent and is due to development during the last nymphal 

 instar. The gonopore in both sexes is between the eighth and 

 ninth abdominal sternite (or at the base of the ninth sternite) 

 and the three pairs of gonapophyses form the genital 

 appendages. 



CERCOPID FEMALE. 



Observations were made upon more than one species of this 

 family and our remarks in general apply to all, but the details 

 refer to Philaenus leucophthalnms (Linn) which was the chief 

 species used. 



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