LAWSON: KANSAS CICADELLID^. 147 



strongly convex anteriorly, lateral margins very short, long humeral 

 margins rounding with very slightly concave posterior margin. Elytra 

 long and narrow. 



Color: Yellowish-green; disc of pronotum and basal portion of elytra 

 darker green, distal portion of elytra lighter. Face fuscous with lighter 

 arcs. 



Exte)-nal genitalia : Female, last ventral segment longer than pre- 

 ceding, lateral margins narrowed posteriorly with slight lateral angles 

 or rounding with posterior margin which is slightly convex, with three 

 small median notches margined with black; pygofers bristly and long, 

 equalling or slightly exceeded by ovipositor. Male, valve large, triangu- 

 lar, apex rather obtuse; plates broad, three times length of valve, regu- 

 larly tapering to acute tips; pygofers long and narrow, exceeding plates, 

 very bristly. 



Distrihution : Taken in Cherokee and Franklin counties. 



Hosts: Grass feeders. Osborn and Ball suggest Sporobolus 

 and Stipa as hosts. 



After studying the types of this species in Professor Ball's 

 collection, and comparing them with specimens of Deltocepha- 

 lus melsheimerii Fh., sent him by Professor Osborn from 

 Maine, it is impossible to agree with Mr. Van Duzee in making 

 these species synonymous. The genitalia, both male and fe- 

 male, are entirely alike. Deltocephalus minimus has the fe- 

 male ultimate segment distinctly notched three times medially, 

 and the lateral margins are distinctly narrowed posteriorly, 

 so that the posterior margin is clearly narrower than the an- 

 terior. Deltocephalus melsheimerii, on the other hand, has a 

 more truncate and unnotched posterior margin which is as 

 wide as the anterior margin, for the lateral margins are not 

 narrowed posteriorly, forming right angles with the posterior 

 margin. In the male genitalia the differences are even more 

 noticeable. In Deltocephalus melsheimerii the valve is shorter 

 and more rounded posteriorly than in Deltocephalus minimus. 

 The plates, however, are very characteristic. In the former 

 they are very broad, and continue, almost parallel-margined 

 to the broad, upturned, obtusely-pointed or truncate apices. 

 In the latter the plates are longer, more slender, and tapering 

 posteriorly to the acute apices which are not upturned. 



Deltocephalus parvulu^ Gill. 



Deltocephalus parvulus Gill., Colo. Agr. Exp. Sta., Bui. 43, p. 23, 1898. 

 Deltocephalvs parvnlug Van D., Cat. Hemip. N. A., p. 647, 1917. 



Form: Much like preceding species. Length, 2.5 to 3 mm. Vertex 

 slightly longer than wide in female, about as long as wide in male, sub- 



