April, 19o2.] North American Species of Athysanus. 233 



CC. lyonger and rather slender. Elytra long, nervures dark, 

 apical cells long ; ovipositor exserted, attenuate, 



exitiosus Ulil. 

 BB. Ground color pale green ; elj'tra distinctly green ; vertex with 

 transverse bands. 

 C. Vertex slightly longer on middle than against eye ; trans- 

 verse band on vertex narrow and straight, striolus Fall. 

 CC. Vertex margins strictly parallel ; transverse band on vertex 

 broader, parallel with the margins, parallelus Van D. 



ATHYSANUS MAGNUS OSBORN AND BAI.L. 



Al/iysanus iiiasinis O. and B. Proc. la. Acad. Sc. IV p. 225 ; PI. XXVI fig. 2. 1S97. 



Resembling the European argentaius but larger, much larger than any 

 other of our species. Vertex parallel-margined, not advanced in front of the 

 eyes. Ash}' gray with a transverse white stripe across the vertex and another 

 on the pronotum. Length 9 8. smni, $ 7. 5mm ; width 3mm. 



Vertex nearl}- four times wider than long, half the length of the pronotum ; 

 front broad, almost flat, triangularly narrowing from the antennae directly 

 to the cl3'peus. 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 : ashy graj-, pronotum darker with a transverse pale 5-ellow 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, roundingl}- narrowing to the 

 middle then triangularly produced. 



Habitat: Minn., la., S. Dak., Neb., Kans., Wyo. and Colo. 



This species is readily recognized by its large size. It is almost 

 identical in structure with argentahcs Fab. the type of the genus 

 Athysamis anji which must stand as the type of the tj'pical sub- 

 genus. 



ATHYSANUS FRIGIDUS BALL. (Plate 16, fig. i.) 

 A//iysaints /rigid us Ball, Ent. New.s. X, p. 172, 1S99. 



Short and stout with a short, swollen head and almost square front. Re- 

 sembling e.vitiosKS 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, $ 4mm; width 1.5mm. 



Vertex over two and one-half 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 



