240 
The Ohio Naturalist. 
[Vol. II, No. 6. 
Vertex sloping, scarcely two-tliirds the length of the pronotum, half longer 
on middle than against eye, front narrower above than in obsoletus, nearly 
parallel-margined until just before the broad apex, clypeus parallel-margined. 
Elytra longer than abdomen in both sexes, narrow and without an appendix. 
Venation distinct, often the cross nervure is double and other irregular cross 
nervures appear in the clavus. 
Color : Female ; vertex straw yellow, a transverse band just back of 
ocelli, an interrupted band either side of this. Face pale, sutures, a large 
spot on clypeus, arcs on the front and a cordate line at its base, black or 
fuscous. Pronotum variably irrorate with fuscous, usually a submarginal 
row of black spots. Elytra with nervures light, the cells irregularly fuscous, 
the cross nervures thickened and broadly white. Male much darker than 
the female, the apex of front, lorae and all but the base of clypeus, black. 
Elytra with the cells nearly black, the white nervures in sharp contrast. 
Genitalia : female segment one-half longer than penultimate, posterior 
margin nearly truncate, median third slightly produced ; male valve nearly 
semicircular ; plates long, triangular, three times the length of the valve, 
side margins slightly emarginate. 
Habitat : Colorado (plains). 
ATHYSANUS PLUTONIUS, UHLER. (Plate 16, Fig. 3.) 
Jassus pinion i us Uhler. Bull. U. S. Geol. Surv. Ill, p. 470, 1877. 
Athysanus plutonius Prov. Pet. Faune Ent. Can. Ill, p. 282, 1889. 
Much smaller and narrower than obsoletus and its allies. Similar to 
anthracinus, but slightly larger and lighter colored and with a more pointed 
vertex. Vertex distinctly, obtusely, angular. Elytra as long as the body, 
almost truncate behind, without an appendix. Length, 9 4-5 mm., $ 4 mm.; 
width, 1.5 mm. 
Vertex twice wider than long, nearly twice longer on middle than against 
eye, slightly obtusely angular, the margins straight ; pronotum rather long, 
half longer than the vertex. Elytra broad, rounding or almost truncate 
posteriorly, as long or slightly longer than the body. Venation typical, the 
central anteapical cell scarcely narrowed, apical ones broad and short, rarely 
much longer than wide. 
Color : black, usually with a line on the base of the vertex, with a point 
extending forward on each side, a pair of oblique spots against the eyes, a 
few spots on pronotum, a pair of irregular stripes on scutellum and the 
nervures of elytra, yellow’. Sometimes there is also a transverse band on 
disc of vertex, an angled one against the tip, fine irrorations over the entire 
pronotum and the centers of the cells as well as the nerves yellow. Usually 
in the males and sometimes also in the females all the yellow markings are 
wanting and the insect is of a shining black, except the basal line of vertex. 
Face black, the arcs on front and sometimes other markings, yellow. Legs, 
black, the anterior and middle pairs abruptly yellow from just before the 
apex of femora, spines on hind tibiae, yellow. 
Genitalia : female segment but little longer than penultimate, the middle 
half roundingly produced, the lateral angles produced and subacute ; male. 
