a Family of Coleopterous Insects. 
615 
and especially the pentamerous tarsi in many of the genera of 
that family; such as Catogenus, Clinidium, Rhy socles, Spc.; upon 
which point I further beg leave to refer the student to my 
paper “On the Affinities of Clinidium,” inserted in the 18th 
Number of the Zoological Journal. 
The following is a Synoptical viezo of the genera belonging to 
the family, and subsequently described. 
< 
'Caput (occllis duabus) thorace immersum . . 3. II ylo torus. 
Elytra subqua- Antennie < l Uasi < 
drat a; palpi la- 
biales elongati. 
biarticulatac. 
Caput (occllis 
ri 
Palpi labiales articulo | 2 Pnussus , 
ultimo elongato ... 1 
nullis) collo s p a |pj lal>i a l e s articulis -j . . 
instructum. |_ ffiqua , ibus } 4 ’ pl <H<jrhopalus. 
Antennae quasi 1 0-articulatse 5. Cerapterus. 
_ Antennae quasi 6-articulatae : . . . 1. Pentaplatarthrus. 
Elytra subovata; palpi labiales brevissimi 6. Trochoideus. 
It will at once be perceived, that the characters laid down 
above tend, in some respects, to give us only an artificial result ; 
resemblance is fully confirmed by tbe similarity in the structure of the trophi, although 
the tarsi (according to the tarsal system) would remove the genera far asunder. 
Since the preceding observations were written, Mr. Curtis with his usual ability has 
illustrated the genus Nemosoma : but in his observations upon its affinities, by again 
implicitly following Latreille as his guide, he has remarked, “ Nemosoma is placed by 
Latreille between Cis and Cerylon, and there can be no doubt that it belongs to the 
Bostricida ; but never having had an opportunity of examining this rare insect until 
now, I have arranged it in my Guide between Bitoma and Rhyzophagus, but its natural 
situation will be near Cis and A pate.” — Now l do not hesitate to state, that the rela- 
tionship of this genus with Cis or Apate is of the most remote and unnatural kind, whilst 
its affinity with Ips, Cerylon, Rhyzophagus, &>c. is perfectly evident from Mr. Curtis’s 
own delineations of several of these and allied genera, especially in the structure of the 
maxillae; and I am convinced that no one on comparing them together and with Sturm’s 
dissections of Trogosita, and my own of Temnoscheila (Zool. Journ. no. 18.), can pos- 
sibly adopt Mr. Curtis’s views, or will doubt that Trogosita is the type of a group of 
genera including those above mentioned. But it is not in the perfect insect alone that 
we are to search for correct ideas of the affinities of the Coleoptera. The larvae, as I 
have before stated, afford the most important clues to their discovery; and Mr. Curtis 
will be surprised to learn that Nemosoma is chilopodiform ; Cis chilognalhiform, hex- 
apod, forked-tailed ; and Scolytus an apod-larva. 
4 K 
VOL. XVI. 
indeed 
