April, 1902.] North American Species of Athysanus. 
241 
valve stout, rounding, half the length of the ultimate segment ; plates round- 
ingly triangular, their apices slightly acute, two and one-half times as long 
as the valve. 
Habitat : Ontario, N. H., N. Y., Iowa, S. Dak., Neb., Kans., 
Colo, and Texas. 
ATHYSANUS ANTHRACINUS VAN DUZEE. 
A thysanus anthracinus Van D. Can. Ent, XXVI. p. 136, 1894. 
Form and structure of plutonius , hut with the vertex shorter, rounding. 
Color black, shiny, first two pairs of tibiae, yellow 7 . Length, 9 4- min., $ 
3.5 mm.; width, 1.5 mm. 
Vertex very broadly, obtusely conical, but little longer on middle than 
against eye, margin confused with front, slightly over twice wider than long. 
Pronotum broadly rounding in front, much less enclosed by the head than 
in plutonius. Elytra as in plutonius , slightly exceeding the abdomen, flar- 
ing at the tips. Front rounding, distant from eyes above, rounding to the 
straight clypeus from below the antennae. 
Color : shining black, the ocelli, two spots on the hind margin of vertex 
and traces of a few 7 arcs on front, yellow. Legs black, the anterior and 
middle pairs yellow 7 from just before the apex of femora. 
Genitalia : female segment as in plutonius , sometimes nearly truncate, 
with the lateral angles blunter ; male valve nearly semicircular, over half 
the length of the ultimate segment ; plates roundingly triangular, with the 
apices blunt, but little over tw 7 ice the length of the valve. 
Habitat: D. C., Iowa, Kans. and Colo. This and the preceding 
species are closely allied and can only be accurately separated by 
the shape of the vertex, which in plutonius is much more pointed 
and together with the eyes encloses more than half of the pro- 
notum, while in anthracinus the vertex is blunter and the eyes 
are broader and shorter. The latter species is always black, 
however, while most of the specimens of plutonius show more or 
less of yellow. 
ATHYSANUS SYMPHORICARPAE BALL. (Plate 16, Fig. 4. 1 
Athysanus symphoricarpae Ball. Can. Ent., XXXIII, p. 5. 1901. 
Longer and narrower than plutonius. Form of strialulus, but larger,, 
broader. Pale testaceous inclined to reddish on vertex. Length, 4.5 mm. ;; 
width, 1.25 mm. 
Vertex broadly rounding, with a blunt, conical apex. Elytra much 
longer than body, with a narrow but distinct appendix, venation as in 
strialulus, the two branches of the first sector again touching before the 
short, outer anteapieal cell, central anteapical cell long, constricted in the 
middle. 
Color : pale testaceous, vertex distinctly reddish in most specimens, ocelli 
blood red. Elytra pale subhyaline testaceous or with a slight olive tinge, 
nervures narrowly pale, the cross nervures slightly wider. Front pale testa- 
ceous, with traces of fuscous arcs. Legs and below, pale orange testaceous. 
