DARNIN ZA. 
I. Tegmina not more than half as long again as the wings; pronotum 
not nodose or spined. 
1. Pronotum covering at least half, and, as a rule, more than half 
the corium, reaching just to apex of tegmina, and sometimes 
exceeding it. 
A. Humeral angle of pronotum strongly produced, auriculate ; 
head about as broad as long. oe ee 
B. Humeral angle of pronotum not or very slightly and obtusely 
produced; head very short, much broader than long. 
a*. Tegmina with three veins starting from, or close to, the 
base of corium. 
at. Pronotum convex, not carinate. 
aj. At least one half of the tegmina exposed, the exposed 
portion being wider towards apex 
bt. At most one third of the tegmina exposed, the exposed 
part being of even width . 
b+. Pronotum compressed, with the dorsal ridge carinate 
6*, Tegmina with two veins starting from the base of corium, 
furcate at about the middle of the latter and at equal 
distances from the base . . . 2. 1. 1. 1. ww ew 
2. Tegmina almost entirely free. 
A, Pronotuin with a longer or shorter porrect frontal horn (rarely 
reduced to an obtuse angle), without lateral horns ; humeral 
angles slightly and obtusely prominent ; areas of tegmina 
oblong, narrow and elongate . . . . 
B. Pronotum with lateral horns or projections above the humeral 
angles, which latter are scarcely, if at all, produced. 
- a. Areas of tegmina oblong, narrow, and more or less elongate ; 
two discoidal areas nearly always present, in which case 
they are of equal size ; if one only is present it is always 
elongate and narrow. 
a*, Pronotum, if viewed from above, very strongly inflated 
in front, and abruptly Produces behind into a long 
lanceolate point an oe . 
b*. Pronotum, if viewed from above, not strongly inflated j in 
front, and gradually narrowed into an elongate, but 
blunter process behind. 
at. Metopidium highly elevated and strongly declivous, 
almost or quite perpendicular; form of pronotum 
differing in the sexes; form more robust 
b+. Metopidium much less elevated, convex, and very 
. gradually declivous ; form smaller and more slender. 
b. Areas of tegmina differing much in size, not elongate oblong ; 
one very large and one much smaller discoidal area 
present ; horns of pronotum strong and recurved . a 
BIOL. CENTR.-AMER., Rhynch. Homop., Vol. II., October 1894. 
. Aspona, Stal, 
Darnis, ¥. 
. Hebeticoides, gen. nov. 
Tropidarnis, gen. nov. 
Stictopelta, Stal. 
Aconophora, Fairm. 
Alcmeone, Stal. 
Hyphinoé, Stal. 
Tomogonia, Stal. 
Ictaranthe, gen. nov. 
*7 
49 
