April, 1902.] North American Species of Athysanus. 247 



ATHYSANUS COLON OSB. AND BALL. (Plate 17, Fig. 2.) 



A///vsa>ins colon Osb. and Ball. Proc. la. Acad. Sc , IV, p. 223, PI. XXVI, Fig. 3, 1897. 



Form and general appearance of cot/una, but with the inner fork of the 

 first sector again forking to form an anteapical cell. Color pattern similar,, 

 but the bands on the elytra broken up into seven or eight stripes, and often 

 a pair of black spots on the middle of the vertex. Length, 9 5 mni., i 4.25 

 mm.; width, 2 mm. 



Vertex slightly shorter than that of cot?i7/ia, face and profile similar ; 

 elytra similar except that the inner branch of the first sector forks again 

 near the middle, forming a loug, wedge-shaped cell, broadest behind where 

 it touches three or four apical cells. 



Color : clear, creamy white, with black spots and stripes as in comma, an 

 additional pair of smaller spots on the disc of the vertex in line with the 

 basal and apical pairs. Elytra with eight fulvous brown stripes as follows : 

 a complete longitudinal stripe just outside the first sector and another next 

 the claval suture, a narrow stripe between the branches of the first sector, a 

 shorter one between the branches of its inner fork, a broadly interrupted one 

 between the first and second sectors, a complete median stripe on the clavus, 

 one on the outer apical half and another on the inner basal half. The apical 

 cells and the apices of the anteapical fuscous margined. 



Brachypterous form, elytra shorter than the abdomen, obliquely truncate, 

 flaring, the apical cells minute or partly wanting ; tergum and pygofers 

 marked as in comma. 



Genitalia : female segment slightly more emarginate than in comma, 

 exposing more of the membrane beneath ; male valve slightly broader, 

 plates with the outer angles strictly rectangular. 



Habitat : Only known from Iowa and Minnesota, where it is- 

 common. Readily separated from comma by the color and vena- 

 tion of the elytra. In all other points they are almost identical.- 



ATHYSANUS SEXVITTATUS VAN DUZEE. (Plate 17, Fig. 3.) 



Athysanui sexvittatus Van Duzee. Can. IJnt., XXVI, p. 93, 1894. 



Resembling comma and colon in form and structure. Smaller and with 

 longer vertex, resembling extriisus in color and elytral venation. Vertex 

 fiat, right-angled in front, a pair of black spots near the apex and two pairs 

 of quadrate, brown spots behind them. Length, 9 4-5 nim., $ 3.5 mm.; 

 width, 1.75 mm. 



Brachypterous form, vertex fiat, the anterior margin thick, slightly wider 

 than long, as long as the pronotum. Profile acutely angled, the face nearly 

 straight ; front as in comma, distant from the eye at the base. Elytra short, 

 obliquely truncate, exposing the pygofers, the last segment and part of the 

 next in the female ; rounding, exposing the pygofers and part of the last 

 segment in the male. Venation distinct, irregular, two and sometimes more 

 cross nervures between the sectors, the outer anteapical cell often minute or 

 wanting, in which case the venation approaches that of colon. 



