254 
The Ohio Naturalist. 
[Vol. II, No. 6, 
Genitalia : female segment very short, scarcely as long as the penulti- 
mate, posterior margin truncate or very slightly emarginate ; pygofers as in 
bicolor , much exceeded by the oviduct ; male valve small, equilaterally tri- 
angular, but little exceeded by the bluntly rounding, bristle-margined plates. 
Habitat: D. C., Md., Iowa, Kans., and Miss. This species 
and the preceding very closely resemble each other in structural 
characters ; obtufus however has a narrower vertex and face and 
more sharply angled elytra. The color pattern is quite distinct 
and it is only very pale females of bicolor that could be confused 
with this species and even these may be separated by the lack of 
fuscous marking on the apical veinlets. 
ATHYSANUS MEXICANUS N. SP. 
Form of obtutus and bicolor , but with a blunter head and still longer 
ovipositor in the female. Color, female greenish or brownish, vertex yellow 
with two black spots on the anterior margin ; male all dusky brown or black. 
Length, 9 3.75 mm., $ 2.75 mm.; width, 1 mm. 
Vertex narrow, subquadrate, a trifle longer than its basal width, a fifth 
longer on middle than against eye, two-tliirds as wide as the long diameter 
of eye, evenly rounding in front, the margin rounding to the face. Front 
narrow and almost parallel-margined until just before the apex, where it 
rounds off to the long, straight-margined clypeus. Elytra as in bicolor , not 
as long as the ovipositor in the female, the apical cells short. 
Color : female, vertex pale yellow, a pair of large, quadrate, black spots 
occupying all of the anterior margin except a median line and a narrower 
one next eye, usually a much smaller pair near the base behind these. Pro- 
notum greenish, or brownish with a few impressed fuscous spots in the 
middle of the anterior submargin. Elytra greenish subhyaline, brownish 
subliyaline with greenish nervures, or entirely smokj- brownish ; ovipositor 
testaceous as seen from above. Face pale yellow, arcs on front, sutures and 
a spot on middle of clypeus fuscous. The upper pair of frontal arcs broad, 
spot-like, separated from each other by a line which is a continuation of the 
line on vertex, and from the spots on vertex by a line but little broader than 
the median one. Male, vertex with the spots like female, but so large, that 
they are only separated by narrow lines or are confluent and uniformly 
fuscous, darker than the eyes ; pronotum brownish fuscous, shiny. Elytra 
brownish or fuscous, the apical margin and rarely the claval areas milky. 
Front black with yellow margins and ver}- short, yellow arcs, rest of face 
brownish, light on genae. 
Genitalia : female segment about half longer than penultimate, margins 
parallel, ovipositor very long and narrow, longer than in bicolor or obtutus, 
exceeding the pygofers by more than the length of the segment ; male valve 
right angled, the apex acute ; plates roundingly triangular, the apex round- 
ing, over twice as long as the valve, submargins with a few, stout, white spines. 
Described from numerous specimens from Orizaba, V. C. Mex. 
collected in Feb. 1892. (H. Osborn.) 
