LAWSON: KANSAS CICADELLID^. 149 



Deltocephalus collinus Boh. 



Deltocephalus collinus Boh., Kong. Vet. Akad. Handl. for 1850, p. 261. 



Deltocephalus aridellus Boh., Kong. Vet. Akad. Handl. for 1850, p. 263. 



Deltocephalus collinus Fieb., Verb. Zool.-Bot. Ges. Wien., xix, p. 216, pi. 6, fig. 42, 

 1869. 



Deltocephalus collinus Edw., Hemip. Homop. Brit. Isds., p. 264, pi. 29, figs. 4, 5, 

 1896. 



Deltocephalus collinus O. & B., Proc. Dav. Acad. Sci., vii, p. 80, 1898. 



Deltocephalus collinus Van D., Cat. Hemip. N. A., p. 647, 1917. 



Form: Robust and like affinis. Length, 3.25 to 4 mm. Vertex about 

 as long as wide, sometimes wider, rather obtusely angled. Pronotum 

 less than twice as broad as long, anterior margin strongly convex, lateral 

 margins short, humeral margins rounding into slightly concave posterior 

 margin. Elytra narrow, either short, reaching to base of penultimate 

 segment and diverging from the tip of the clavus, or long in some females, 

 exceeding the abdomen. 



Color: Greenish-yellow, practically unicolorous ; vertex sometimes 

 marked with light brown on either side of a light stripe enclosing the 

 dark, median, impressed line. Pronotum sometimes with signs of six 

 fuscous longitudinal lines. Elytra with light nervures, tip hyaline, ab- 

 domen sometimes marked with fuscous stripes. Face fuscous marked 

 with light median line and arcs. 



External genitalla: Female, last ventral segment longer than preced- 

 ing, narrowed posteriorly, posterior margin seemingly with five lobes, the 

 two outer light colored ones small, and separated shallowly from the 

 small black lobes next to them, and these in turn separated by a deeper 

 excavation from the light colored median lobe ; pygofers narrowed basally, 

 long and narrowed, bristly, slightly exceeding the ovipositor. Male, last 

 ventral segment two-thirds as long as preceding ; valve large, nearly twice 

 as wide as long, obtusely angulated posteriorly; plates broad, margins 

 convex till near the apex, then concavely narrowing to the obtuse apices 

 which are slightly exceeded by the spiny pygofers. 



