Dec., 1903 .] 
Aradidae of Ohio. 
37 
Head a trifle longer than wide, anterior process coarsely granulate, pro- 
notuni widening sliglitljy 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. Eh’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 couuexivum, and indistinct annulations on the legs. 
This species may be mistaken for crcnatus 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 di.stinctly fuscous instead of grayish. Say gives the equal 
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 b3’ Prof. Hine at Cincinnati, also a 
pair collected by Mr. Dury at .same place. 
Aradus crenatus Say. 
Aradus crenatus Say. Heterop. Heniip. (1831). Coll. Writ. I, 350. Stal Emira. 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 gra3’ish brown. Length ii mm. 
Head slight!}- longer than broad. Anterior process rather slender, antennae, 
joints 2 and 3 nearly equal, two usuall}- a trifle longer, fourth about two- 
thirds of three. Pronotum widening anteriorly-, anterior margin denticulate, 
disk 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 rounded 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 
abdominal 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 man3' of the other species. It is longer and 
liroader and the abdomen more dilated than aequalis. The anten- 
nal joints 2 and 3 “sub-equal,” according to Sa3', are in my 
specimen in proportion of 5 to 6, the second being the longer. 
One specimen collected at Columbus, and I have before me one 
eollected at Cincinnati by- Mr. Dury. 
Aradus robustus Uhler. 
Aradus robustus Uhl. Proc. Bo.st. ,Soc. Nat. Hist. (1871) p. 104 and (i878) p. 419. 
This species is of a dark gray to blackish color, the antennae 
very robust. Length -6 mm. 
