COLEOPTERA. 
469 
by their narrow and elongated form, their thorax which has the 
figure of a long square, and the prominence of their eyes * * * § . 
Sometimes the maxillary palpi are subulate or terminate in a more 
slender joint, short and conical. 
OcTHEBius, Leac/t, Germ . — Elophorus, Fab . — Hydr^ena, ll/ig., Lat. 
The thorax is nearly semi-orbicular 
There, the maxillary paljn, terminated by a fusiform joint, larger 
than the penultimate and pointed at the end, are much longer than 
the antennse and head. The epistoma is strongly emarginated. 
Their appearance otherwise is that of the Octhebii. 
Hydr^ena, Kugel. Leach 
In the other Hydrophili the body is ovoid or almost hemispherical, 
and generally convex or arched, and the tliorax always smooth and 
wider than it is long ; the tibiae are terminated by strong spurs, and 
the tarsi most frequently ciliated. The extremity of their mandibles 
is bidentated. They embrace the family of the Hydrophilidea, Leach, 
or the genus Hydrophilus, Fab. 
Some have but six joints in the antennae ; their epistoma is emar- 
ginated. Such are those which form the 
Spercheus, Fa6. §. 
In the following the antennae are always composed of eight or nine 
joints, and the ejfistoma is entire, or on the anterior margin slightly 
concave. 
A species transmitted to us by our friend Doctor Leach presents 
such singular characters that Ave have been induced to consider the 
Insect as the type of a new subgenus 1|, the 
Globaria, Lat . 
So named because its body is almost spherical and laterally com- 
pressed, and because it appears susceptible of forming a ball, like an 
Agathidium, Its antennae appear to me to be composed of but eight 
joints, of which the fifth is dilated into a spine at the internal side, 
the sixth forms a reversed and elongated cone, the seventh cylindri- 
* Elophorus elongatus, Fab. ; — E. crenatus, Id. ; — brevis, Gyllenh. See Germ., 
Insect. Spec. Nov. I, p. 90. 
-f- E. pygmceus, Fab. ; —Hydreena riparia, Lat . ; — Hydrana margipaUens, Lat. ; 
— Elophorus inarinus, Gyll. See Germ., Ib., p. 90. 
J E. minimus, Fab. Gyll.; Ilypnxna riparia, Kugel. ; H. longipalpis, Sehoenh., 
Germ., Faun. Insect., Eur. VIII, 6. For the other species, see Germ., Insect. 
Spec. Nov., I, p. 93. 
§ Spercheus emarginafiis. Fab. ; Panz., Faun. Insect. Germ., XCI, 4. M. Bour- 
don, a Freneh naturalist who is now exploring Colombia, first discovered this 
species in the vicinity of Paris. 
II It would seem to come more naturally near that of Berosus, Leach ; but on 
account of the number of the antennal segments, I think it best to place it directly 
after Spercheus. This order, however, might be reversed by commencing with 
those subgenera which have nine joints in the antennae, and ending with those in 
which there are three legs, or with Globaria and Spercheus. 
