IOWA ACADEMY OF SCIENCES. 
80 
B. Thorax roundingly six-angular, posterior margin round- 
ing, with a slight medianexcavation. Vertex longitud- 
inally furrowed. Claval veins distant Aulacizes. 
BB. Thorax 4-angular, posterior margin broadly, roundingly 
emarginate, the anterior and posterior margins nearly 
parallel. Claval veins often united in the middle or 
approaching and tied by a cross nervure. 
C. Vertex long, triangular, longer than width 
between eyes side margins nearly straight, face as 
seen from side nearly straight Homalodisca. 
CC. Vertex obtusely rounding, shorter or only equal 
to width between eyes, face as seen from side 
roundingly angled Oncometopia. 
AA. Ledge above antennal sockets small, the anterior extremity 
as seen from above not projecting, included in the curve of 
the head, Anterior tibiae slender round or triangular, Elytra 
broad, covering the abdominal tergum. Head and pronotum 
rarely sloping. 
B. Elytra not reticulate veined at the apex, at most with 
five apical and three anteapical cells. Head not greatly 
produced. 
C. Vertex with the margin rounding obtuse, the 
front inflated. 
D. Antennae setaceous, pronotum not twice 
as long as scutellum the posterior margin 
long not strongly emarginate . . Tettigonia . 
v DD. Antennae in the male enlarged at the apex. 
Pronotum less than twice as long as the 
scutellum, posterior margin short deeply 
emarginate Helochara. 
CC. Vertex flat, the margin sharp or line-marked, 
distinct, vertex and front forming an acute angle, 
front broadly transversely convex, not inflated... 
Diedrocephala. 
BB. Elytra reticulate veined from the apex as far back as 
the forking of the outer branch of the first sector. Head 
often produced into a triangle, longer than pronotum.. 
Draeculacephala. 
GENUS AULACIZES AM. AND SERV. 
Head slightly inclined, vertex moderately long, bluntly round- 
X ing disc, nearly flat longitudinally, furrowed front gibbous, clypeus 
as seen from side obtusely angled, a distinct ledge over antennal 
sockets, pronotum inclined anteriorly long, 6-angular widest at the 
lateral angles, rounding behind with a slight median emargination 
as in Tettigonia, anterior tibiae furrowed on upper side, elytra not 
concealing lateral margin of abdomen. 
But one species of this genus has been found in the 
United States. 
