2 54 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 

 hicolor, 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 ; obtutiis 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 obtiihis 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 mni., $ 2.75 mm.; width, i mm. 



Vertex narrow, subquadrate, a trifle longer than its basal width, a fifth 

 longer on middle than against eye, two-thirds 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 j-ellow, 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 

 subhyaline with greenish nervures, or entirely smoky brownish ; ovipositor 

 testaceous as seen from above. Face pale j'ellow, 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. Eh'tra 

 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 obtutiis, 

 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.) 



