Mr. Westwood on the Affinities of Clinidium. 223 
In the produced formation of the underside of the head the two genera 
are, however, alike, as also apparently in their trophi. I was not, how- 
ever, able either to examine those organs or the tarsi so accurately as I 
could have wished. 
Of the other genera, hitherto placed in the family Cucujtde, the 
nearest approach to the two preceding groups is made by 
PASSANDRA, 
founded by Dalman in the Appendix to the 3rd volume of Schénherr’s 
Synonymia Insectorum, p. 146, and figured in Tab. 6, fig. 3 of that 
work. On its affinities Dalman merely remarked, “‘ Statura sublinearis, 
“« depressa, et facies fere Passali.”’ Latreille, in the Familles Naturelles, 
p- 398, correctly places the genus, without any remark upon its indivi- 
dual characters, in his family Platysomes (Cucujipes.) There is, how- 
ever, the following interesting observation made in that work upon that 
family, “ Ces Coléoptéres, ainsi que les Trogosites et les Prostomis 
** (Megagnathus), se rapprochent sous quelques rapports des Lucanides.”’ 
The chief of these “ rapports’’ appear to me to consist in the pentame- 
rous tarsi and general character and habits of the insects; and in the for- 
mation of the labium and maxille of Rhysodes, as well as in the charac- 
ters of Passandra, other and much greater resemblances are discoverable. 
In the new edition of the Régne Animal, Vol. V. p. 101, Latreille 
has, however, altered the situation of the genus Passandra, and has in- 
cluded it in his third division of the Xylophages, placing it as the last 
genus after the Trogositarii, with the remark, ‘“ Ces insectes sont évi- 
«* demment le passage de cette famille (Trogosite) 4 la suivante (Cu- 
** cuji or Platysomes). Ils ne different méme des Platysomes que par leurs 
« antennes.”’ It is evident that Latreille here alludes to the increased size 
of the last joint of the latter organs, fig. 3, C. In every other respect, 
not only in general formation, but also in the similarity of structure of 
the under side of the head, (which I have figured in Tax. Supp. xiv. fig. 
3, A,) it will be perceived, that a most intimate connexion exists between 
this genus and the two preceding, and the description of the trophi given 
by Dalman tends to confirm this affinity. If Latreille, however, was 
anxious to shew the affinity between his Trogositarii and Cucujipes, there 
are other and much more satisfactory links (as I shall subsequently en- 
deavour to prove) to establish the connexion, than the mere incrassation 
