Dec, 1903.] Aradidae of Ohio. 37 



Head a trifle longer than wide, anterior process coarsely granulate, pro- 

 notuni widening slightly, anterior margin with irregular denticles. Disk with 

 four rough longitudinal elevations on posterior half and two approximate 

 and still more elevated ridges on anterior half. Elj'tra moderately dilated at 

 base, nearly reaching the tip of abdomen. 



Abdomen moderately broad, sides subparallel, appearing somewhat cren- 

 ulate. Color dark fuscous with grayish suffused spots on sides of pronotum, 

 base of elytra and connexivum, and indistinct annulations on the legs. 



This species may be mistaken for crenahis Say as it approaches 

 that species in length and has the margin of the abdomen simi- 

 larly ornamented. It is, however, narrower, the abdomen with 

 sides distinctly fuscous instead of grayish. Say gives the eqtial 

 length of joints 2 and 3 of the antennae as the distinctive charac- 

 ter, but in the specimens in hand I find a slight deviation from 

 an exact equality, the second joint being a trifle longer. 



Two specimens collected by Prof. Hine at Cincinnati, also a 

 pair collected by Mr. Dtiry at same place. 



APADUS CRENATUS Say. 

 Aradhs crenains^a.y. Heterop. Heniip. (1831). Coll. Writ. I, 350. Stal p;nutn. Hem. Ill, 

 137. Osborn. Proc. O. S. A. S. VIII, p. 77. 



The largest of our native Aradids, the abdomen broad, the 

 margins crenate. Color gra^-ish brown. lyength ii mm. 



Head slightly longer than broad. Anterior process rather slender, antennae, 

 joints 2 and 3 nearlj- equal, two usually a trifle longer, fourth about two- 

 thirds of three. Pronotum widening anteriorly, anterior margin denticulate, 

 di.sk with subparallel, elevated granulate ridges. Scutellum elongate, trian- 

 gular. Elytra expanded at base, distinctly narrower at apex and occupying 

 only the central disk of the abdomen. 



Abdomen broad, oval, margin crenate, the posterior lobes roimded behind. 

 Beak reaching the posterior edge of anterior coxae. 



Color gray, with light grayish or pallid area on the sides of prothorax, 

 base of elytra and occupying a large part of the exposed portion of the dorsal 

 alidominal segments ; beneath gray, the venter suffused with reddish, legs 

 light fuscous with gray annulations. 



This elegant species seems to be of rare occurence, or, at least, 

 it is rarely taken, though from its color it would seem to be fully 

 as conspicuous as manj^ of the other species. It is longer and 

 broader and the abdomen more dilated than aequalis. The anten- 

 nal joints 2 and 3 " sub-equal," according to Say, are in my 

 specimen in proportion of 5 to 6, the second being the longer. 



One specimen collected at Columbtis, and I have before me one 

 collected at Cincinnati by Mr. Dury. 



Aradus robustus UhIvER. 



Aradiis robustus Uhl. Proc. Best. Soc. Nat. Hi.st. (1871) p. 104 and (i878) p. 419. 



This species is of a dark gray to blackish color, the antennae 

 ver}' robust. I,ength 5^-6 mm. 



