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The gênera of the Neididse having been rather indifferently 

 described, I hâve included in the description some generic charac- 

 ters. Apart from the apparently somewhat difïerently structured 

 head and the longer basai joint of the rostrum, this insect seems to 

 hâve aile other characters of the genus Triconulus Horv., which is 

 said to differ from Megalomerium Fieb., inter alia, by having the 

 pronotum posteriorly trituberculate. However, Puton says in his 

 generic description of Megalomerium that the pronotum nas 

 « extrémité de la carène médiane et épaules un peu relevées » 

 and in his description of the typical species, M. méridionale Costa 

 (which is unknown to me) he says : « trois bossettes avant le bord 

 postérieur ». The orificial process seems to be very fragile in 

 M. tenerrimum, being broken in différent ways in some spécimens. 

 In the larva of tenerrimum the antennae and legs are ornamented 

 with very numerous black annuli which almost entirely disappear 

 in the imago. This is the first Neidid recorded from Madagascar. 



