442 EXTERNAL ANATGMY OF INSECTS. 
upper lobe somewhat resembles the galeate maxilla 
just named; but consists of two joints. This exists in 
Staphylinide, &c. ‘The last kind I shall notice is when 
the upper lobe not only consists of two joints, but is cy- 
lindrical, and assumes the aspect of a feeler or palpus°. 
This is the common character of almost all the Preda- 
ceous beetles. This lobe, which has been regarded as an 
additional feeler, is strictly analogous to the upper lobe 
in other insects, and therefore should rather be denomi- 
nated a palpiform lobe than a palpus. Where there are 
two lobes, the upper one is most commonly the longest ; 
but in many species of the tribe last mentioned the 
lower one equals or exceeds it in length «. 
The lobes vary in form, clothing, and appendages. 
The upper palpiform lobe in those beetles just men- 
tioned, in general varies scarcely at all in form ; but the 
genus Cychrus (which is remarkable for a retrocession 
from the general type of form of the Eutrechina making 
an approach towards that of those Heteromera which, 
from their black body and revolting aspect, Latreille has 
named Melasomes,) affords an exception, the upper joint 
being rather flat, linear-lanceolate, incurved, and cover- 
ing the lower lobe *, which it somewhat resembles. The 
lower lobe also in this tribe varies as little as the upper, 
being shaped like the last joint of that Jobe in Cychrus 
just described, except that in Cicindela it is narrowest in 
* Prate XXVIL. Fic. 11. d!’. el”. 
> Prate VI, Fic. 3. d’”’. 
© Clairv. Ent. Helvet. t. 1. t. xviii. f. super. 6. 
* Ibid. ¢. xix. b. This genus may be the analogue of some hetero- 
merous one yet undiscovered, as Calosoma is of Adelium (Kirby Linn. 
Trans. xii. t. xxil, f. 2.). 
