THE OCCURENCE OF A PROBABLE GYNANDROMORPH 



IN THE HOMOPTERA. 



DwiGHT M. DeLoxg. 



Gynandomorphism occurs almost exclusively in insects and 

 has been found in different and quite diverse orders, including 

 Lepidoptera, Hymenoptera and Diptera, where it is commonly 

 found, and more rarely in Coleoptera. This condition has 

 never been reported, however, for a member of the Homoptera 

 although previously noticed no doubt by workers in this group. 

 Prof. J. G. Sanders has observed this condition in a single 

 specimen of Deltocephahis sayi. 



This curious phenomenon may be manifest in two different 

 ways, either by ah anterior-posterior arrangement of both male 

 and female structures, or by a lateral arrangement. The latter 

 type is by far the most prevalent and very often a butterfly 

 or moth is found with one wing of male and the opposite one 

 of female coloring; also flies, ants and bees will often display 

 the lateral type, but it is very rare that anterior-posterior 

 gynandomorphism is found. 



The specimen at hand is Chlorotettix unicolor Fh. which was 

 kindly sent to me with some other Cicadellidce by Frank H. 

 Lathrop and was collected at Corvallis, Oregon. The species is 

 of a uniform green color and the structural characters of typical 

 examples of the two sexes are just alike except the genitalia, so 

 the occurrence of both male and female characters in this 

 specimen is determined entirely by these genital structures, 

 which are quite different and distinct in the two sexes. 



By a study of this specimen and a comparison of the geni- 

 talia with those of the typical male and female, some very 

 striking similarities and resemblances to parts of the genitalia 

 of each sex is noticed and a combination of typical characters 

 of both sexes is seen instead of a set of different or freakish 

 characters. I will attempt to point out these similarities with 

 the aid of the accompanying diagrams which show the genitalia 

 of the typical male and female, also the specimen having the 

 combination of characters. 



If this is a gynandromorph which seems to be the case, 

 it is of the anterior-posterior type, the anterior structures being 

 female and the posterior male. 



The last ventral segment of the abdomen is undoubtedly 

 a female segment and contains the median notch on the posterior 



226 



