and. Classification of Rhynchota. 241 
drometre and Nepe seem to be entirely destitute of 
odoriferous glands; I have at any rate searched in vain for 
any external opening. 
In Reduvit these organs are generally very little developed. 
It is exceedingly difficult to find the small’ punctiform open- 
ings of the ducts, which are placed in a small impression 
close in front of the posterior pair of coxæ; and in man 
species of this family I have sought them in vain. Only in 
abis the openings are shaped like a slit, and rendered still 
more observable by the existence of a slightly impressed, 
narrow spout-groove, which is continued, close in front of the 
posterior coxa, a little way upwards, on the side of the meta- 
sternum ; but there are only slight vestiges of an evaporating- 
surface. 
On account of the considerable development of the second, 
and still more of the third pair of coxæ, in Pagiopoda, the 
lateral part of the metasternum becomes very narrow and 
pointed, and the place for the glandular apparatus therefore more 
confined. In Capsus the lower extremity of the side of the 
metasternum is occupied by a small evaporating-surface, which 
18 ply bounded by a distinct transverse line, and in its 
middle exhibits the opening of the duct, with more or less 
raised margins, but very short spout. The variation in 
Shape is but small; the groups of Pithanus and Melanocoris 
are distinguished by the considerable development of the 
margin. In Miris the opening varies more; but the evapo- 
rating-surface is generally less developed, and less sharply 
defined. In Miris, sens. strict., the posterior lip of the spout 
is continued into a short thick knob; but in the groups of 
Notostira and Leptopterna the whole of the short spout is con- 
siderably raised ; in the group of Trigonotylus the opening is 
> i rt narrow spout-groove, of which the 
margins are very slightly raised; but the most remarkable 
arrangement is that of the group of Teratocoris, where the 
te is still more minute, punctiform, and hidden between 
the last two pair of coxz, in consequence of which it is diffi- 
cult to discover, unless the coxe of the second pair are re- 
moved : both groove and evaporating-surface are wanting. In 
Anthocoris, Xylocoris, and Acanthia, the whole of the meta- 
sternum is developed as an pen gi Tele ; the opening 
is rather large, the spout-groove sharply and deeply cut, but 
