CIXIIDiE. 13 



distinct. In many aspects it answers to the descrip- 

 tion of Issus inntcatiis, Fieb. ; but I agree with Mr. 

 Douglas, who kindly examined the insect, that it has 

 the characteristics of a pupa, and thus I leave it under 

 the name of the ordinary species. 



v.— CIXIIDiE. 



The relation of the Cixiidse with the Delphacids 

 may be seen in the forms of the face, with its raised 

 keels or carinas, and the reticulations of the wings. 

 There are, however, differences of structure as regards 

 the processes attached to the genitalia of both sexes. 

 These processes on the pj^gophore of Cixhis project 

 laterally beyond the end of the genital segment. When 

 the styles of the male can be dissected out, data are 

 available for the diagnosis of the species. Mr. J. Scott 

 makes out ten British species, but Mr. J. Edwards has 

 recently reduced these to nine.* 



Highly developed insects are commonly furnished 

 with wings having a complex venation. Thus the 

 Cicadidu' and Cixiida'. are contrasted with the simpler 

 Typhlocybid«, whose elytra show far plainer characters 

 in neuration. This complex netting in the former 

 group suggested to Kirschbaum the descriptive term 

 Dictyophoridae, from ^tKruov and fffi^. 



The Cixiidae are numerous in the hotter parts of the 

 world, and interest attaches to many of them from 

 their secretions of silky and waxy matters. Many 

 Homoptera elaborate these products from special 

 glands situated within the abdominal rings; notably the 

 Cocci and Aphides ; and amongst the Cicadidas, some 

 of the British Cixiidae. 



Mr. A. C. Morgan considers that the often beautifully 

 arranged waxy plates and threads which cover some 

 Coccidffi proceed from organs relating to the intestinal 

 or digestive system, and lie thinks that thoy represent 



■■'■ Vide Trans. Ent. Soc. ISSO, p. 41 ; also Knt. Mo. iMa<,'.. Octohor, 

 1888, p. 100. 



