25° The Ohio Naturalist. [Vol. II, No. 6, 



margin straight, lateral margin very short. Elytra longer than abdomen in 

 both sexes, almost parallel-margined ; venation as in osborni, two cross 

 nervures between the sectors and the central anteapical cell, divided. 



Color : vertex straw yellow, slightly greenish cast, a pair of approximate, 

 triangular spots just behind the apex and a large pair of oval ones inside and 

 behind the ocelli. A line across the base of the apical spots would fall in 

 front of the oval ones. Scutellum pale yellow, pronotum and elytra pale 

 green, the nervures lighter. Front brownish, with pale arcs. 



Genitalia : female segment a little longer than penultimate, suddenly 

 narrowed from near the base, the lateral angles rounding, exposing the 

 rounding angles of another membrane, posterior margin roundingly emargi- 

 nate, with a triangular median tooth ; male valve transverse, very small ; 

 plates together, semicircular, with their apices produced, half longer than 

 the ultimate segment, their margins fringed with course hairs. 



Habitat : N. Y., Md. and N, J. Strikiugl}' distinct from any- 

 other described species. The characters of this and the two pre- 

 ceding species are very puzzling and contradictory ; in some 

 points they appear closely related, in others not at all. The}' are 

 not very closely related to the others in this group and are only- 

 placed here for convenience until their larval forms and life- 

 histories are known. 



The name simplex is preoccupied in this genus by simplex 

 Sahib., of Europe. 



SUBGENUS STIRELLUS NOV. 

 Head about as wide as pronotum, vertex narrow, rarely as 

 wide as the long diameter of an eye, usually longer than its basal 

 width. Front inflated, almost touching eyes above ; vertex and 

 front produced into a long, conical point, their margins.indistinct. 

 Elytra narrow, about as long as the abdomen ; venation as in 

 Athysanus, regular ; ovipositor long and narrow, extending 

 beyond the elytra except in cin'tisii. 



Type of subgenus A. bicolor Van Duzee. 



Key to the Subgemis. 

 A. Female ovipositor but little, if at all, exserted, rarely extending beyond 

 elytra ; face pale yellow with a fuscous " Y " resting on clypeus and 

 its arms extending to the eyes, ciirtisii Fitch. 



A A. Female ovipositor long and narrow, extending beyond pygofers often 

 one-fourth its length, usually extending bej'ond elytra ; face without 

 the " Y." 

 B. Face with a transverse, white band below eyes, occup3'ing all the 

 lower half except the apex of clypeus. Anterior margin of 

 pronotum and scutellum, black, bicolor Van Duzee. 



BB. Face unicolorus or with scattered fuscous markings ; pronotum 

 unicolorous or with a row of submarginal spots. 

 C. Vertex right-angled, produced in front of eyes and coni- 

 cally pointed ; four round, black spots in a square be- 

 tween the eyes, obliitus Van Duzee. 

 CC. Vertex obtusely rounding, extending but little in front of 

 eyes, two large, black spots on anterior margin in female,, 

 male entirely dark, mexicanus n. sp. 



