240 The Ohio Naturalist. [Vol. II, No. 6, 



Vertex sloping, scarcely two-thirds 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. 

 Eh'tra 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 nerv'ures 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 i6, Fig. 3.) 



Jassiis plutoiiiits Uhler. Bull, U. S. Geol. Surv. Ill, p, 470, 1877. 

 Athysanus plutonius Prov, Pet. Faiine Ent. Can. Ill, p. 282, 1889. 



Much smaller and narrower than obsoletus and its allies. Similar to 

 anthracitius, 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 nnn., $ 4 mm.; 

 width, 1.5 mm. 



Vertex twice wider than long, nearh' 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 bod)\ 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 irregubir stripes on scutelhmi 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 



