April, 1902.] North American Species of Athysanus. 
247 
ATHYSANUS COLON OSB. AND BALL. (Plate 17, Fig. 2.) 
Athysanus colon Osb. and Ball. Proc. Ia. Acad. Sc . IV, p. 223, PI. XXVI, Fig. 3, 1897. 
Form and general appearance of comma , 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 mm., $ 4.25 
mm.; width, 2 mm. 
Vertex slightly shorter than that of comma , face and profile similar ; 
elytra similar except that the inner branch of the first sector forks again 
near the middle, forming a long, 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 ; terguin 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.) 
Athysanus sex v Hiatus Van Duzee. Can. Unt., XXVI. p. 93, 1894. 
Resembling comma and colon in form and structure. Smaller and with 
longer vertex, resembling exlrusns in color and elytral venation. Vertex 
flat, 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 mm., <? 3.5 mm.; 
width, 1.75 mm. 
Brachypterous form, vertex flat, 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 pj'gofers, 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. 
