180 """ "' IOWA ACADEMY OF SCIENCES. 



Genitalia: Ultimate ventral segment of the female moder- 

 ately long, nearly truncate behind, curved downward in the 

 middle, giving it an emarginate appearance, the edge often thin 

 and membranous. The last ventral segment of the male longer 

 than the pronotum, truncate, concealing the valve. Plates 

 narrow, ligulate, nearly four times longer than wide, longer 

 than the last ventral segment, nearly equaling the pygofers, 

 separated at the base by one-half their width, obliquely overlap- 

 ping at tip. Pygofers broad at base, obliquely truncate from 

 below, tips produced incurved and touching each other. 



Color very variable, early specimens of both broods, especi- 

 ally of the first, light green, the yellow lines indistinct; elytra 

 nearly hyaline, nervures weak. This form is the flavilineata 

 Fitch, and striata Burmeister. Late specimens of the first 

 brood and nearly all of the second are dark green with the 

 elytra strongly reticulate. The yellow lines may be strongly 

 marked or almost wanting; these include the forms described 

 as quebecensis Prov. , cana, Burmeister and flavilineata Spang- 

 berg. Specimens collected during the latter part of September 

 and throughout October were more or less tinged with red, 

 especially in the females. Specimens being taken which varied 

 from the lines red, through forms that had the lines and the 

 elytral reticulations red, to females that were almost entirely 

 scarlet dorsally, these last being the typical octolineata form. 



Throughout the whole series the structural characters, with 

 the exception of the strength and number of the reticulations, 

 scarcely varied. 



These conclusions are based on the examination of hundreds 

 of specimens showing the most complete intergradations in all 

 these variations. In accord with the general rule for jassids, 

 the first brood, mostly flavilineata form, are weakly veined, and 

 those of the second brood, mostly octolineata form, are strongly 

 veined and more highly colored. 



Larvae are very broad and depressed, more so than the adult, 

 which it much resembles. The vertex is abruptly narrowed in 

 front of the eyes, then strongly projecting with parallel mar- 

 gins and a broadly rounding apex, the whole projection 

 extremely thin, antennas nearly as long as body, basal joint as 

 long as vertex, abdomen long and compressed; general color 

 green. 



The pupse are broader, shorter, darker green than the lar- 

 vae, and have two fuscous spots on the inner angle of the wing 

 pads. 



