April, 1902.] North American Species of Athysanus. 239 



about seven broad arcs on front omitting both basal and apical margins, the 

 antennal sockets and sometimes a spot on margins of lorae fuscous. 



Genitalia : female segment half longer than the penultimate, the lateral 

 angles rounded, the median third emarginate with a stout median process 

 tipped with two divergent teeth, male valve as broad as the ultimate segment 

 and about half as long ; plates triangular, slightly narrower than the valve, 

 three times as long, together convex, their margins slightly concave ; 

 pygofers compressed beneath the plates, the posterior angles triangularly 

 produced, curved upwards, not extending beyond the plates. 



Habitat : Mountains of Colorado. 



ATHYSANUS OBSOIvETUS KIRSCHBAUM. 



Al/iysanits obsoletus Kirscht). Die Athysanus Arteu v. Wiesb., p. 7, 1858. 

 Athysanus obsoletus Prov. Pet. Faune Ent. Can. Ill, p. 281, 1SS9. 

 Athysanus obsoletus Van D. Bull. Buff. .Soc. Nat. Sc. V, No. IV, p. 199, 1S94. 

 Athysanus relativus Gill, and Baker. Hemip. Colo., Bull. 31, 1895. 



Smaller and paler than c.rtrusus, with a blunter vertex. Vertex shorter 

 than pronotum, rounding in front. Pale straw-yellow, sometimes with a 

 pair of dark spots on vertex. Length, 4.5-5 mm.; width, 2 mm. 



Vertex rounding, half longer on middle than against eyes, two-thirds the 

 length of the pronotum, broadly rounding to the front. Front broad above, 

 roundingly narrowing to the clypeus. Elytra broad, exposing the pygofers 

 and the ultimate segment in the female, distinctly longer than the abdomen 

 in the male ; venation Athysanoid, slightly variable, apical cells minute in 

 female, of medium size in male. The specimens from Van Couver's Island 

 have the elytra still shorter in the female and only as long as the abdomen 

 in the male. 



Color : pale straw yellow, often unmarked above, sometimes with a pair 

 of dark spots on the disc of the vertex, and some of the cells on the elj'tra 

 fuscous heightened along the margins of the light nervures ; sutures of face 

 and arcs of front sometimes broadly fuscous. 



Genitalia : female segment half longer than penultimate posterior margin 

 roundingly or slightly angularly emarginate one-third its depth, its apex 

 with a small, pointed tooth ; male valve small, weak, triangular, one-third 

 the length of the ultimate segment ; plates three times the length of the 

 valve, roundingly narrowing to the broad, blunt apex, together bluntly 

 spoon-shaped, the margin fringed with weak spines. 



Habitat: (Europe), Ontario, N. Y. , Iowa, Colo, and Van- 

 couver's Isd. Doubtless occurs throughout the northern half of 

 the United States and well up into Canada. 



ATHYSANUS VARUS BALL. 



Athysanus varus Ball. Can. Ent. XXXIII, p. 5, 1901. 



More slender than obsoletus, with the elytra long and narrow ; much 

 smaller and darker than e.rirusus, with the cross nervures broadly tinged 

 with light. Straw colored, clouded with fuscous. Vertex with transverse 

 bands. Elytra dark, with the nervures light, cross nervures broadly so. 

 Length, 9 5 mm., $ 4.25 mm.; width, 1.5 mm. 



