COLEOPTERA. lOl 



Trogosita, Oliv. Fab. — Platycerus, Geoff. 



In some, the antennae are shorter than the thorax, or at most ot an 

 equal length, and terminated l)y a compressed and somewhat ser- 

 rated club, formed by the three or four last joints. The ligula is 

 entire. 



Trogo>ita, Fab. 



In Trogosita proper, the mandibles are shcjrter than the head, and 

 crossed; the ligula, almost square, is not prolonged between the 

 palpi, and the maxillae have but a single lobe. 



T. mauritanicm ; Tenebrio mauritanicus,!^.; Oliv., Col. II, 

 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 *. 



Prostomis, Lat. — Megagnathus, Meg. — Trogosita, 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 maxillae. The 

 body is long, narrow and and almost linear f . 



The antennae 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 



Passandra Dalm. Schcenh.\ 

 FAMILY III. 



PLATYSOMA. 



Our third family of the Tetramera approaches the second, so far as 

 relates to the internal anatomy, the tarsi, and habits ; but the antennae 

 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. 



t Trogosita mandibuJaris, Fab. Sturm in his Faun. Insect. Germ., has figured it 

 well, and the parts of the mouth also. 



J Schoenh., Syuon. 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 antennte. 



For some other genera of the Tetramera, such as Litophilus, Ayathidium, and 

 Chjpeaster, see the family of the Clavipalpi. 



