hemiptera heteroptera. 
41 
B. Membrane with double generally elongate trian- 
gular rectilinear or curvilinear areolets, 
a. First joint of the hind tarsi twice or thrice longer 
than the second joint. 
* Prothorax as broad as long, reverse-trapeziforra, 
much straightened hindward. Mesothorax un- 
covered. - 
** Prothorax elongate-trapeziform. Mesothorax 
covered. 
t Head with rounded sides. ... 
+t Head with parallel sides. 
X Prothorax with no rim on the fore border. 
§ Cheek-plates short, almost semicircular. 
X Tip of the vertex truncated, even. 
o Rostrum extending to the second ventral segment, 
oo Rostrum extending to the hind border of the 
mesopectus. _ 
X X Tip of the vertex conical. 
First joint of the rostrum longer than the under 
side of the head. - - . . 
^ First joint of the rostrum as long as the under 
side of the head. - 
§§ Cheek-plates long, linear. 
X First joint of the rostrum longer than the under 
side of the head. - 
X X First joint of the rostrum as long as the under 
side of the head. - . _ _ 
Myrmecoris. 
PiTHANUS. 
Minis. 
Brachytropis. 
Notostira. 
Lobostethus. 
Megaloceroea, 
Trigoxotylus. 
Prothorax with a rim on the fore border. 
§ Sides of the prothorax foliaceous or sharp-bordered. 
X Tip of the vertex forming a prominent cone. 
X X Tip of the vertex rounded. 
o Eyes half-round. Rostrum extending to the hind 
border of the metapectus. . . _ 
00 Eyes oval, almost reniform. Rostrum extending 
to the hind border of the mesopectus. 
§§ Sides of the prothorax truncated or rounded. 
X First joint of the hind tarsi not thicker than the 
other joints. 
o Second joint of the antemuE clavate. - Cremnocephalus. 
oo Second joint of the antennae linear. - - Oncognathus. 
X X First joint of the tarsi much thicker than the two 
following joints. 
o Second joint of the antennas clavate. First joint 
of the hind tarsi cylindrical. - - - Alloeotomus. 
00 Joints of the antennae cylindrical. First joint of 
the hind tarsi clavate. . - - - Pachypterna. 
b. First joint of the hind tarsi shorter than the 
second joint, or equal to it in length. 
* Head above transversely oval or triangular. Eyes 
contiguous, or nearly so. 
f Prothorax in front with a rim or swelling. 
J Neck arched, with no transverse border or rim. 
Acetropis. 
Leptopterna. 
Teratocoris. 
G 
