132 THE UNIVERSITY SCIENCE BULLETIN. 



KEY TO SPECIES.* 



A. Vertex flat, not channeled toward its apex, anterior margin round- 

 ing to the front; elytra without white areolar spots, dorsalis. 

 AA. Vertex more or less channeled toward the apex, anterior edge thin, 

 acute or subacute. 

 B. Face pale or yellow, usually infuscated at base and sides. 



C. Markings of vertex in the form of lineations, usually a 

 pale median line and a faint, slightly divergent one 

 either side. 

 D. Face distinctly infuscated at sides; elytral mark- 

 ings distinct; length, 5 mm. acnttis. 

 DD. Face obscurely infuscated at sides; elytral mark- 

 ings indistinct; length, 4 mm. or less. 



cinereiis. 

 CO. Markings of vertex in form of a broken transverse vitta, 

 median line short and apical. frontalis. 



BB. Face entirely brown or fuscous. scriptus. 



Platymetopius dorsalis Ball. 



I'latymeto/nits frontalis var. dorsalis Ball, Ent. News, xx, p. 164, 1909. 

 Platymetopius dorsalis Van D., Ann. Ent. Soc. Am., iii, p. 224, 1910. 

 Platymetopius dorsalis Van D., Cat. Heniip. N. A., p. 637, 1917. 



Form: Length, 4 mm. Vertex three-fourths as wide as long, flat, not 

 channeled toward the apex, margins rounding. Pronotum nearly three 

 times as wide as long, anterior margin convex, posterior margin slightly 

 concave, lateral margins short, humeral margins long. Elytra broad and 

 exceeding the abdomen. 



Color: Yellow and fulvous; vertex creamy yellow, pronotum bright 

 brown or fulvous with sides yellow, scutellum yellow, elytra bright ful- 

 vous with distal half of clavus and apices lighter. Face and below pale 

 yellow. 



External genitalia: Female, last ventral segment long, posterior mar- 

 gin roundingly and medially produced; sparsely spined pygofers are long 

 and narrow, slightly exceeded by the ovipositor. 



Distribution: The only specimens of this species taken are 

 the type specimens from Pottawatomie county. 



Platymetopius acutu^ (Say.). 



(PI. II, figs. 5-7.) 



Jassvs acvtvs Say, Jl. Acad. Nat. Sci., Phila., vi, p. 306, 1831; Compl. Writ., ii, p. 382. 

 Platymetopius acutus Uhl., Bui. U. S. Geol. Surv., iii, p. 473, 1877. 

 Platymetopius acutus Osb., Proc. la. Acad. Sci., i, pt. 2, p. 126, 1892. 

 Platymetopius acutus G. & B., Hemip. Colo., p. 84, 1895. 

 Platymetopius acutus O. & B., Proc. la. Acad. Sci., iv, p. 192, 1897. 

 Platymetopius acutus Van D., Ann. Ent. Soc. Am., iii, p. 219, 1910. 



* .\dapted from key by Van Duzee, Ann. Ent. Soc. Am., iii, p. 210, 1910. 



