of the Amazons Valley. 177 



nute tubereulata, parte apicali lincis tenuissimis furcatis nigris, 

 medio guttis sparsis nigris ; thorace linea transversa nigra : foe- 

 minee capite lato fulvescente ; maris capite angusto, fusco, inermi. 

 Long. 8-11 lin. <$ $. 



This species is distinguished by the basal portion of the elytra 

 being thickly covered with small glossy-black tubercles, of which 

 one at the hinder part of the humeral prominence is much 

 larger than the rest. The tuberculated area ceases abruptly 

 behind, and the disk of the elytra has only a very few scattered 

 and slightly elevated black specks, which towards the apex sub- 

 side into simple spots, not raised at all from the smooth surface. 

 The general colour is pale ashy grey (white beneath); the apical 

 part of the elytra has a few fine black lines in the form of a 

 double or treble fork joined at the base. The male differs 

 greatly in width of head from the female, but the antennas 

 scarcely differ in proportionate length or stoutness ; they are, 

 however, more nearly approximated at their bases by one-half 

 in the male than in the female, which gives to a male insect an 

 appearance quite foreign to the genus. The male specimen be- 

 fore me has a finely reticulated black patch across each elytron 

 at the tips of the forked lines, of which there is only a trace in 

 one of the female examples. 



Para, and at Santarem on the Tapajos. 



5. Oncideres crassicornis, n. sp. 



O. subcylindricus, postice utroque sexu attenuatus, fulvo-brunneus ; 

 elytris basi tuberculis diversis sparsis instructis, postice punctis 

 impressis rufescenti-brunneis in lineis furcatis ordinatis ; maris 

 antennis basi valde incrassatis, capite bicornuto. Long. 9-10 

 lin. 6 2 • 



Head not much wider in the female than in the male, brownish 

 tawny, with the usual black stripe below each eye ; antenniferous 

 tubercles in the male dentiform on each side. Antenna? dark 

 brown, simple in the female, one-half longer than the body in 

 the male, with the basal and third joints much thickened, espe- 

 cially the latter. Thorax impressed transversely, and furnished 

 on each side with a tubercle ; colour brownish tawny. Elytra 

 narrowed to the tip in both sexes, tawny brown, inclining to- 

 wards ashy near the middle ; the basal part raised in the middle, 

 and studded with a moderate number of scattered tubercles, dif- 

 fering greatly in size, and all glossy black; from the middle to 

 the apex there is a number of shallow punctures covered each 

 with a reddish-brown spot and arranged in forked lines. Body 

 beneath and legs clothed with tawny-brown tomentum. 

 Ega, and banks of the Tapajos. 



Ann. cy Mag. N. Hist. Ser. 3. Vol. xvi. 13 



