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THE UNIVERSITY SCIENCE BULLETIN. 



External male genitalia: Styles triangular, with a long process to 

 connective, lateral margin with a small, but distinct notch preapically, 

 apex obtuse and granulated; connective flat, with middle portion cut 

 away; oedagus long and robust, heavier basally, sinuate to obtusely 

 rounded bifid apex, with a slightly chitinized basal, dorsally projecting 

 process for attachment to the base of the anal tube. 



Distribution: One of the commonest species as shown by the 

 following map. Sometimes occurs in swarms at lights. 



Hosts: Blue grass chiefly, among many grasses and weeds. 

 Osborn records it as injurious to wheat and oats also. One 

 of the most destructive of our leaf hoppers. 



Deltocephalus osborni Van D. 



Deltocephalvs osborni Van D., Trans. Am. Ent. Soc., xix, p. 304, 1892. 

 Athysanus osborni O. & B., Proc. la. Acad. Sci., iv, p. 220, 1897. 

 Athysanus- osborni O. & B., Ohio Nat., ii, p. 249, pi. 17, fig. 4, 1902. 

 Athysanus osborni Osb., 20th Kept. N. Y. St. Ent., p. 527, 1905. 

 Ahtysan-us osborni Kirk., Haw. S. P. A., Exp. Sta. Bui., iii, p. 58, 1907. 

 Deltocephalus osborni Van D., Cat. Hemip. N. A., p. 649, 1917. 



Form: Large and robust. Length, 4.5 to 5.5 mm. Vertex about one 

 and a half times as wide as long, disc flat, rounding with front, apex ob- 

 tusely or roundingly angled. Pronotum short, over twice as wide as long, 

 lateral margins very short. Elytra usually longer than abdomen, some- 

 times shorter, flaring, clavus not reticulate, two cross nervures between 

 the sectors, middle anteapical cell divided. 



Color: Almost uniformly straw- or tawny-yellow; vertex with four 

 black marginal spots, the middle ones larger. Pronotum with five pale 

 longitudinal lines. Elytra with light nervures, often margined with 

 fuscous. Face with pale median line and arcs. 



External genitalia: Female, last ventral segment composed of two 

 membranes, the rounded lateral corners of the deeply excavated inner 

 one showing at the sides of the basally broad, posteriorly much narrowed 



