HEMIPTERA. yi 
+  ASTEMMA, 
With certain species in which the antennz are gradually setaceous 
and where the second joint is of equal thickness and almost glabrous. 
The thorax is hardly narrower before than behind, and forms a trans- 
versal square, or is cylindrical; the head is as if incised perpendicu- 
larly or rounded at its origin(1). 
Mirrs, Fab. 
Similar to Astemma in the antennz, but removed from it by the 
thorax, which is much wider posteriorly than before, and trape- 
zoidal(2). 
Capsus, Fab. 
A similar and trapezoidal thorax, but the second joint of the an- 
tenne jis attenuated at base, and densely pilose, particularly towards 
the extremity, otherwise almost cylindrical and slender like the 
first(3). 
HerTEeroTomMA, Lat. 
The Heterotomz2 are very distinct from the preceding Insects by 
the size and width of the two first joints of the antennz, and of the 
second particularly, which forms an elongated palette; the two last 
are very short(4). 
In the remaining Hemiptera of this family there are but two or 
three apparent joints(5) in the sheath of the sucker; the labrum is 
short and without striz. ‘The first joint of the tarsi, and frequently 
even the second, is very short in the greater number. 
Sometimes the legs are inserted in the middle of the pectus; they 
terminate by two distinct hooks which originate from the middle of 
the extremity of the tarsus; they can neither be used as oars, nor for 
running on the water. 
We then separate those species in which the rostrum is always 
(1) The Saldz pallicornis, flavipes, Fab., and some other species, but in which 
the body is much narrower and longer, and somewhat more analogous in the head 
to the Myodoche. 
(2) Fab., Syst. Ryng.; Lat., Ib. p. 124. 
(3) Fab., Syst. Ryng.; Lat. Gener., Crust. et Insect., II, p. 123. 
(4) Capsus spissicornis, Fab. 
(5) Four in the Reduvii, but the first is very short, almost null. 
