478 COLYDIIDA. 
denticulations very obscure, the surface grey, with a definite black, oblique stripe behind 
each eye. Elytra clothed with white scale-like sete, which are extremely minute, and 
in addition with regularly placed rather larger serial sete ; with four black marks very 
near the base disposed in a transverse manner, and behind these with a large common 
black mark very abruptly defined behind; the whole of the basal half of the elytra 
without marks. 
Subfam. MEMATIDIINA. 
In this group we meet with insects of very elongate cylindrical form; the antenne 
have a two-jointed club and are retractile, there being grooves for their accommodation 
near the eyes. The front coxe are placed a good deal anterior to the hind margin of 
the prosternum, and this character readily distinguishes the group from the Colydiine ; 
the prosternal process is as prominent as the coxe, and is prolonged behind them. 
The ciliation of the prosternal hind margin is excessively minute. So far as I know, 
the group includes only Mematidium and an uncharacterized genus from Borneo. 
NEMATIDIUM. 
Nematidium, Erichson, Naturg. Ins. Deutschl. iii. p. 275, nota (1845) ; Horn, Proc. Am. Phil. Soc. 
xvi. p. 576. 
Filumis, Reitter, Verh. Ver. Brinn, xiv. p. 16. 
This very interesting genus was established for a single species, which has the pro- 
sternum behind the cox constructed in a different manner from most other Colydiide ; 
the prosternal process being prolonged backwards and apparently reposing on and 
soldered to the apices of the epimera. It has hence been stated that the structure in 
this respect is that of the Rhynchophorous series. I, however, entertain grave doubts 
as to the epimera being really joined in the Nematidiine, for on carefully cleaning the 
specimens an appearance of a triangular piece—in addition to the prosternal process— 
is seen separating two rounded points; an appearance which indicates that the true 
apices may possibly be themselves separated, but connected by the interposition of a 
small piece very closely soldered to them. 
The typical species, WV. cylindricum, is said to occur in Brazil and North America, 
though it has not been found in our region; several others have been subsequently 
added to the genus. Filumis tenuissima, Reitter, is scarcely determinable from the 
description and figure; the genus was assigned by this latter writer to the Trogo- 
sitidee. 
1. Nematidium fryanum, sp. n. (Tab. XV. fig. 11.) 
Valde elongatum, cylindricum, ferrugineum, nitidum, elytris fuscescentibus ; capite prothoraceque crebrius sat 
fortiter punctatis ; elytris striatis, ad apicem vix oblique retusis, pone suturam obsolete longitudinaliter 
impressis ; prosterni processu apice depresso, quam prosternum ipsum evidenter breviore. 
Long. 9 millim, 
