6 Flemiptera-feteroptera. 
prominent, occasionally they are produced, or even pedi- 
cillate, as in Henestaris; in the Corixidee, etc., they are 
very large and-triangular, and looked at from above occupy 
the whole of the sides of the head; the ocelli, when present, 
are two in number and often large and prominent; they 
are absent in many of the genera and very minute in 
others ; in front of the eyes, on the sides of the head, are 
the antenniferous tubercles from which the antennee spring ; 
these vary in size and are sometimes on the upperside and 
sometimes on the underside of the head, e.g. they are 
hidden by the margin of the head in the Pentatomide ; in 
the Coreide, Tingididee, Aradidze, etc., they are often pro- 
duced laterally into a process or spine; the antenne 
themselves are not very variable in form; they are gene- 
rally four-jointed, but have five joints in the Pentatomida 
and the Nabidz, six in the genus Velia, and as many as 
eight in the genus Coranus ; whereas the number is limited 
to three in some of the aquatic genera. In the eight joints of 
the antennze of the genus Coranus, one of the Reduyiidee, are 
reckoned certain very short supplementary joints which 
occur between the longer ones. As a rule they may 
be said to be filiform, but occasionally the apical joint 
is enlarged and frequently, especially im the Capside, 
the second joint is more or less swollen, much so in 
Atractotomus, etc., aud in one genus, Heterotoma, it is 
much dilated and flattened ; in the Reduviide the last two 
joints are generally thinner than the preceding ones, and in 
the Tingidide the third joint is abnormally long ; in the 
Cryptocerata they are short and hidden under the head. 
The face is composed of three lobes, the central one of 
which is considered by most Entomologists to be analogous 
to the clypeus of other orders. Messrs. Douglas and Scott, 
on the other hand, consider that the front of the crown, as 
developed in the Capsidee, is the clypeus, and call the facial 
lobe mentioned above, the central lobe of the face; I have 
adopted their nomenclature as there is no difficulty in 
