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. 



Athysanus antluacuius Van D. Can. Knt, XXVI, p. 136, 1894. 



Form and structure of plutoniiis, but with the vertex shorter, rounding. 

 Color black, shiny, first two pairs of tibiae, yellow. Length, 9 4- mm., $ 

 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 

 vci 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 arcs on front, yellow. Legs black, the anterior and 

 middle pairs yellow 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 round ingly triangular, with the 

 apices blunt, but little over twice 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 iw phdonhis is much more pointed 

 and together with the eyes encloses more than half of the pro- 

 notum, while in anthracimis the vertex is blunter and the eyes 

 are broader and shorter. The latter species is always black, 

 however, while most of the specimens oi pluto7iius show more or 

 less of yellow. 



ATHYSANUS SYMPHORICARPAE BALL. (Plate 16, Fig. \.\ 

 Athvsanus symphoricaipac "HaW. Can. Ent., XXXIII, p. 5, 1901. 



Longer and narrower than plutonius. Form of striatuliis, 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 bod}', with a narrow but distinct appendix, venation as in 

 siriaiiiliis, the two branches of the first sector again touching before the 

 short, outer anteapical cell, central anteapical cell long, constricted in the 

 middle. 



Color : pale testaceous, vertex distinctly reddish in most specimens, ocellJ 

 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. 



