COLEOPTERA. ' 519 



equal length, and terminated by a compressed and somewhat ser- 

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

 entire. 



Trogosita, 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 maxillae have but a single lobe. 



T. mauritanicus; Tenebrio mauritanicus, L. ; 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 

 Cadelle, attacks grain(l). 



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 almost linear(2). 



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. Schoenh.(3) 



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 



(1) For the other species, see Oliv., Ibid. 



(2) Trogosita mandibular is, Fab. Sturm, in his Faun. Insect. Germ., has figured 

 it well, and the parts of the moutli also. 



(3) Schoenh., 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 antennae. 



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

 Clypeaster, see the family of the Clavipalpi. 



