64 IOWA STUDIES IN NATURAL HISTORY 
with black except at tip which is white and broadly rounded; a more or 
less distinct transverse depression near middle; base more finely punctate 
and usually with an impunctate whitish callus at each angle and on the 
median line. Hemelytra sparsely, irregularly punctate, often more or less 
reticulately punctured; embolium punctured entirely to costal margin 
which is not distinctly paler; membrane pale brown with five or six ner- 
vures. Venter yellowish, the disk smooth, the sides minutely wrinkled, 
the reddish and black punctures closer on the sides; three series of more 
or less distinct blackish punctures on each side; an aggregation of fine 
black punctures at the outer angle of each incisure. Tergum black. Con- 
nexivum yellow with two black spots at the ends of the incisures. Ven- 
tral plates of thorax yellowish, coarsely, irregularly punctured with reddish 
brown; from one to three black dots on each side of the three principal 
sternal plates including one at the ostiolar opening. Legs yellowish, the 
femora minutely, rather closely punctured with brownish or blackish; 
tibiae finely punctured with brownish, darker towards tip; tarsi rufous 
to reddish brown, the claws black at tip. Length, 8.0-10.0 mm. Width 
across pronotum, 5.0-6.0 mm. 
This is typically a western form more or less characteristic 
of the Rocky Mountain region and but a single Iowa record is 
available. Osborn records one specimen from Ames. (Proce. Ia. 
Acad. Sci., V, 232, 1897). Zimmer reports the species from 
Nebraska and adds, ‘‘Not common but found in the northern 
and western parts of the state.’’ (Contrib. Dept. Zool. No. 4, 
Univ. Neb., 6, 1911). It has also been recorded from Kansas, 
Colorado, Montana, Utah, Lower California and British Amer- 
ica. In addition my own collection contains specimens from 
Oregon, Washington and New Mexico. 
Peribalus limbolarius Stal 
1872. Peribalus limbolarius Stal, Svensk. Vet. Handl., 10, no. 4, 34. 
1872. Peribalus modestus Uhler, Rept. U. S. Geol. Surv., V, Pt. 4, 396. 
1876. Peribalus modestus Uhler, Bull. U. S. Geol. Geogr. Surv., II, 289. 
1877. Peribalus limbolarius Uhler, Bull. U. S. Geol. Geogr. Sury., III, 4038. 
1880. Peribalus limbolarius Distant, B. C. A. Rhynch. Het., I, 65, Pl. 6, fig. 19. 
1904. Peribalus limbolarius Van Duzee, Trans. Am. Ent. Soc., XXX, 32. 
1909. Holcostethus limbolarius Kirkaldy, Cat. Hem. (Heterop.), I, 48. 
General form subdepressed, ovate, narrowed more posteriorly than P. 
abbreviatus. Color grayish or reddish yellow punctured with black, the 
black punctures assuming a more or less reticulate pattern on hemelytra 
and scutellum. Head finely punctured with black the punctures denser 
and finer at the sides before the eyes; a short, impunctate, yellowish 
line on tylus between eyes; juga much longer than tylus, usually meeting 
in front but sometimes not in contact at tips; margins of head a little 
reflexed, not so distinctly sinuate in front of eyes as in P. abbreviatus; 
head beneath pale yellow, irregularly punctured, a few blackish punctures 
