166 THE UNIVERSITY SCIENCE BULLETIN. 



ovipositor, usually short, covering second abdominal segment, coriaceous 

 and coarsely rugose. Abdomen broad, inflated in female. 



Color: Shining black; vertex sometimes with reddish-brown markings, 

 legs and ovipositor reddish-brown. 



External genitalia: Female, last ventral segment longer than pre- 

 ceding, three times as wide as long, narrowed posteriorly, margins about 

 parallel ; pygof ers broad and short, much exceeded by the very long ovi- 

 positor. Male, last ventral segment longer than preceding, emarginate 

 posteriorly; valve broad, rounded posteriorly; plates broad, diverging 

 from the base, broadly rounded apically, equalling the short pygofers. 



Disti-ibution : Taken in Pottawatomie and Cherokee counties. 



Hosts: Doctor Ball informs me that Grindelia is the host 

 plant of this species. 



Driotura gammaroidea var. fidva Ball. 



Driotvia gammaroidea var. futca Ball, Can. Ent., xxxv, p. 231, 1903. 

 Driotura gammaroidea var. ftilra DeL., Tenn. Bd. Ent., Bui. 17, p. 64, 1916. 

 Driotura gammaroidea var. fiilva Van D., Cat. Heniip. N. A., p. 654, 1917. 



Form: In size and shape as in gammaroidea. 



Color: Nearly uniformly reddish-brown. Last segment of abdomen 

 and ovipositor dark. Eyes and ocelli dark. 



Genitalia: As in gammaroidea. 



Distribution : Reported from Cherokee county only. 

 Hosts: That of preceding form. 



Driotura robusta 0. & B. 



Driotura rohuxta O. & B., Proc. Dav. Acad. Sci., vii, p. 87, pi. 4, fig. 4, 1898. 

 Driotura robusta Mete, Jl. Elisha Mitchell Soc, xxxi, p. 28, 1915. 

 Driotura robusta DeL., Tenn. St. Bd. Ent., Bui. 17, p. 64, 1916. 

 Driotura robusta Van D., Cat. Hemip. N. A., p. 654, 1917. 

 Driotura robusta Lathr., S. C. Agr. Exp. Sta., Bui. 199, p. 73, 1919. 



Form.: Slightly smaller than gammaroidea. Length, 2.75 to 3.5 mm. 

 Vertex slightly longer than in gammaroidea, otherwise structure much 

 the same. 



Color: Vertex varying much in markings, sometimes being light yellow 

 with several small dark spots, often the anterior part with a few black 

 marks and the disc with two large irregular spots. Face light above 

 with dark arcs, then greater part of front black, tip of front light, and 

 clypeus with large black spot. Pronotum anteriorly black, posterior two- 

 thirds white, sometimes partly blackened. Elytra black with the nervures 

 and ramose lines white. Abdomen maculately black and white. 



External genitalia : Female, last ventral segment twice as long as 

 preceding, lateral margins broadly rounded with slightly medially emar- 

 ginate posterior margin; pygofers wedge-shaped, much exceeded by the 

 very long ovipositor. Male, last ventral segment longer than preceding, 

 emarginate posteriorly; valve broad but short, rounded posteriorly; 



