228 CERAMBYCID/E. 



antennae, especially on the inside, with some long scattered 

 hairs. Thorax blackish, surface covered with a short greyish 

 silky pubescence ; back with five elevations, the three anterior 

 largest, approximating behind, the two posterior transverse and 

 near the hind margin, which is transversely grooved. Elytra 

 with the shoulder and the base yellow, a large black patch ter- 

 minating obliquely behind the middle, with an oblique almost 

 longitudinal white band, running parallel to the front of the 

 brown mark ; a transverse white band beyond the middle ; apex 

 white, mucronated, the space between the white band and the 

 apex covered with a widish rusty-brown band broadest at the su- 

 ture; scattered hairs spring from the punctures ; under side and 

 legs pale ferruginous tinged with brown, closely covered with 

 short greyish hairs ; legs with longish scattered hairs. Posterior 

 femora reaching to end of elytra. 

 Hab. Amazon (Tapayos) (Coll. W. B. Bates). 



27. Ibidion biarcuatum, n. s. B.M. 



I. thorace nigro fusco laevigato marginibus anticis et posticis fer- 

 rugineis ; elytris flavescentibus, apice albis mucronatis, plaga 

 utrinque alba elongata, arcu nigro literam X fere formante. 

 Long. lin. 7i- 



Head brown, the vertex smooth, face rugose, notch of eye 

 covered with silvery-grey hairs ; eyes large, projecting, with the 

 facets very distinct. Antennae ferruginous, first joint blackish 

 on the outside, punctured, with a projecting tooth in front at the 

 apex, joints from the third grooved and angled. Thorax blackish- 

 brown, smooth, polished, front and hind margins ferruginous, 

 cylindrical, somewhat bent in front and somewhat contracted 

 behind. Scutellum covered with silvery hairs. Elytra of a pale 

 yellow tinged with brown with the tip white, a large white 

 patch on the side of each, with a black arch in it, the rounded 

 part not reaching the suture ; punctured, the punctures in lines ; 

 apex of elytra near the margin with a sharp point. Legs pale, 

 tibiae grooved, femora of hind legs with two spines at the apex 

 reaching to beyond the end of elytra, plates at base of middle 

 legs with close adpressed silvery pile. Abdomen at the base fer- 

 ruginous, the apical segments brownish-black, all covered with 

 short shining pubescence. 

 Hab. Amazon (Tapayos) (Coll. W. B. Bates \ 



28. Tbidion thoracicum, n. s. B.M. 

 I. elytris pallide luteis fasciis quatuor angustis obscuris, prima 



obliqua, alteris transversis singulis lineis 5 punctorum di- 



