and Classification of Rhynchota. . 245 
observable in C. pinicola, prasinus, nigricornis, and rufipes, 
on account of its black colour, whilst the sternum is green; 
the evaporating-surface in all these species is very large, and 
reaches so far as to occupy part of the mesosternum. 
similar arrangement to that of these species of Cimez is 
seen in Acanthosoma; the extremity of the spout-groove 
a considerably in A. lituratum, which at the same time 
is distinguished from the other Danish species of this genus by 
a remarkable round black spot on the green chest, immediately 
under the point of the spout-groove. Asopus, too, has a long 
spout-groove, but the evaporating-surface is here very small 
and restricted to the metathorax ; at the same time both it and 
the spout-groove vary according to the species. The spout- 
groove is of a red colour, with a metallic-green point in A. bidens, 
whilst the underside of the thorax is yellowish grey, with 
Coret the opening is situated nearer the cox, or even in 
the middle of the sternum, between the posterior and the 
second pair of coxe. In Syromastes and Coreus it is lateral, 
turned outwards, forming a short, widely open split, with very 
raised margins, and without a spout-groove; the evaporating- 
surface is not plainly circumscribed, it surrounds the open- 
ing, and has a narrow prolongation on the mesothoracic suture. 
In Pseudophleus nubilus the opening is close to and in a line 
with the second pair of cox, is long, wide open, with highly 
raised borders, and a projecting, very short spout-groove broadly 
rounded at its extremity; the so samp MS is not 
plainly defined, and occupies both sides of the mesothoracic 
suture. In Aldus the large oblong opening is placed on the 
sternum close in front of the third pair of coxe; it has 
