April, 1902.] North American Species of Athysanus. 
2 33 
CC. Longer and rather slender. Elytra long, nervures dark, 
apical cells long ; ovipositor exserted, attenuate, 
exitiosus Uhl. 
BB. Ground color pale green ; elytra distinctly green ; vertex with 
transverse bands. 
C. Vertex slightly longer on middle than against eye ; trans- 
verse band on vertex narrow and straight, s/rio/us Fall. 
CC. Vertex margins strictly parallel ; transverse band on vertex 
broader, parallel with the margins, parallelus Van D. 
ATHYSANUS MAGNUS OSBORN AND BALL. 
Athysanus mag n us O. and B. Proc. Ia. Acad. Sc. IV p. 225; PI. XXVI fig. 2. 1S97. 
Resembling the European argentatus but larger, much larger than any 
other of our species. Vertex parallel -margined, not advanced in front of the 
eyes. Ashy gray with a transverse white stripe across the vertex and another 
on the pronotum. Length 9 S- 5mm, $ 7. 5mm ; width 3mm. 
Vertex nearly four times wider than long, half the length of the pronotum ; 
front broad, almost flat, triangularly narrowing from the antennae directly 
to the clypeus. Pronotum transverse, nearly parallel-margined. Elytra dis- 
tinctly longer than the body, venation typical Athysanoid pattern, usually a 
cross nervure between the claval veins. 
Color : ash)- gray, pronotum darker with a transverse pale yellow band 
just back of the middle ; vertex with a pale band ; elytra with the nervures 
distinct, margined with light, the centers of the cells irrorate with brown, 
costal margin creamy yellow ; face brownish irrorate. 
Genitalia : female segment as long as the penultimate, posterior margin in 
four rounding lobes, the inner pair smaller and separated by a triangular 
notch ; male valve obtusely triangular, plates nearly twice the length of the 
ultimate segment, four times that of the valve, roundingly narrowing to the 
middle then triangularly produced. 
Habitat: Minn., Ia., S. Dak., Xeb., Kans., Wyo. and Colo. 
This species is readily recognized by its large size. It is almost 
identical in structure with argentatus Fab. the type of the genus 
Athysanus and which must stand as the type of the typical sub- 
genus. 
ATHYSANUS FRIGIDUS BALL. (Plate 16, fig. 1.) 
Athysanus frigidus Ball, Ent. News. X, p. 172, 1S99. 
Short and stout with a short, swollen head and almost square front. Re- 
sembling exitiosus but much stouter. Color dirty white, four black spots on 
anterior margin of vertex and four more before them on the face. Length 
9 4.5mm, S 4mm ; width 1.5mm. 
Vertex over two and one-lialf times wider than long, half longer on mid- 
dle than against eye, broadly rounding to the tumid front ; front wider than 
long, the apex twice the width of the clypeus. Elytra broad, short, just 
covering the abdomen in female, slightly longer in the male, venation 
obscure, typical Athysanoid, apical cells scarcely longer than wide. 
Color: vertex white, four large, shining, black spots on the anterior 
margin, the inner pair near the apex, the outer pair outside the ocelli, a pair 
