COLEOPTERA, 101 
Trogosita, Oliv. Fab.—Ptatycrrvs, Geoff. 
In some, the antenne are shorter than the thorax, or at most ofan 
equal length, and terminated by a compressed and somewhat ser- 
rated club, formed by the three or four last joints. The ligula is 
entire. 
Trocosita, Fab. 
In Trogosita proper, the mandibles are shorter than the head, and 
crossed; the ligula, almost square, is not prolonged between the 
palpi, and the maxillz have but a single lobe. 
T. mauritanicus ; Tenebrio maurttanicus, L.; Oliv., Col. IT, 
19, i, 2. About four lines in length; blackish above; light 
brown beneath; elytra striate. Found in nuts, bread, and under 
the bark of trees. Its larva known in Provence by the name of 
Cadella ; attacks grain *. 
Prostoms, Lat—Mercacnatuus, Meg.—Trocositra, Fab. 
Where the mandibles are longer than the head, and project pa- 
rallel to each other; the ligula is narrow, elongated and extended 
between the palpi, and there are two lobes to the maxilla. The 
body is long, narrow and and almost linear +. 
The antennze of the others are as long as the body, and of equal 
thickness, as far as the tenth joint inclusively; the following and last 
one is larger, in the form of a reversed triangle, and obliquely trun- 
cated at the end. The ligula is bifid. They form the 
Passanpra Dalm. Schenh.t 
FAMILY II. 
PLATYSOMA. 
Our third family of the Tetramera approaches the second, so far as 
relates to the internal anatomy, the tarsi, and habits; but the antennze 
are of equal thickness throughout, or more slender towards the ex- 
tremity. The mandibles are always salient, the ligula is bifid or 
emarginated, the palpi are short, the body is depressed and elongated, 
and the thorax almost square. These Insects are found under the 
bark of trees,and may be reduced to a single genus, the 
* For the other species, see Oliv., Ibid. 
+ Trogosita mandibularis, Fab. Sturm in his Faun. Insect. Germ., has figured it 
well, and the parts of the mouth also. 
¢ Scheenh., Synon. Insect., I, 3, App., p. 146, vi, 3. These Insects evidently 
form the passage from this family to the following one. They even only differ from 
the Platysoma in their antenne. 
For some other genera of the Tetramera, such as Litophilus, Agathidium, and 
Clypeaster, see the family of the Clavipalpi. 
