SCUTELLEROIDEA OF IOWA 63 
Genus PERIBALUS Mulsant and Rey 
1866. PrriBatus Mulsant and Rey, Punaises de France, Pent., 
937. 262. 
1909. tHowcosterHus Kirkaldy, Cat. Hem. (Heterop.), I, 47. 
The nearly twenty representatives of this genus are confined 
to the Palaearctic and American regions. Three representa- 
tives have been recorded from Iowa. 
Body not pilese above. Head broad, rounded in front, the juga with- 
out lateral tooth, longer than tylus and contiguous or almost contiguous at 
anterior extremity; sides of head moderately sinuate in front of eyes. 
Humeri rounded, not prominent. Apex of scutellum distinctly narrowed. 
Ostiolar orifice prolonged into a _ suleus which gradually becomes 
evanescent. Base of abdomen unarmed. Tibiae suleate above. 
Key to the species 
Connexivum alternated; head longer and broader. .abbreviatus 
Connexivum black with a pale margin; head shorter and nar- 
rower 
Body more depressed, gradually narrowed posteriorly; gen 
eramcOlorm Wehten. ch ere ee limbolarius 
Body strongly convex, broader behind middle; scutellum 
broad at tip: eeneral color darker.....:.........22. prceus 
Peribalus abbreviatus (Uhler ) 
1872. Holcostethus abbreviatus Uhler, Rept. U. S. Geol. Surv., V, 397. 
1877. Holcostethus abbreviatus Uhler, Bull. U. S. Geol. Geogr. Surv., III, 403. 
1904. Peribalus abbreviatus Van Duzee, Trans. Am. Ent. Soc., XXX, 33. 
1909. Holcostethus abbreviatus Kirkaldy, Cat. Hem. (Heterop.), I, 47. 
General form subdepressed, oval. Color grayish to reddish brown 
spotted with black. Rugulose and irregularly punctured with black. 
Head long, broad, widely rounded in front, closely punctured with black, 
the punctures on the tylus and along sides of head confluent; juga flat- 
tened, longer than tylus and meeting or almost meeting in front of it; 
margins of head rather distinctly sinuate in front of eyes; head beneath 
pale yellowish, coarsely punctured, a few coarse punctures in front of eye 
black or blackish. Antennae long, slender, pale yellow to rufous, the basal 
segment very short, pale; second and third longer, subequal; fourth and 
fifth still longer and subequal. Rostrum pale yellowish, extending to first 
visible ventral segment; tip and median line blackish. Pronotum short, 
broad; posterior half rather sparsely, irregularly punctate with smooth 
calluses between the punctures; anterior half more finely, densely 
punctured, the punctuation of the lateral submargins very dense; lateral 
margins yellowish or reddish yellow, arcuate, a little thickened and ele- 
vated, smooth and impunctate; humeri more prominent and_ broadly 
rounded than in P. limbolarius. Scutellum rather finely, closely punctured 
