486 Mr. C. O. Waterhouse on 



which has the antennae partly ferruginous ; but this, I think, is 

 clearly not a specific character. 



Cerambycidae. 



Xestia polita, n. sp. 



Nigra, nitidissima ; thorace transversim rugulose, elytria sat crebre 

 punctatis, ad apicem fere lsevibus, quadrispinosis ; femoribus rufo- 

 castaneis, apice nigris, tibiis tarsisque piceis. 



Long. 12 lin. 



Antennal tubercles obtuse, thickly punctured, as well as the 

 front of the head. Antennae as long as the elytra and half 

 the thorax ; the basal joint strongly and thickly punctured. 

 Thorax as long as broad, subcylindrical (scarcely at all ar- 

 cuate at the sides), constricted at the extreme base and apex, 

 in the usual way, with coarse close punctures at the sides ; the 

 dorsal ridges rather regular and carried evenly across the 

 disk, which is not impressed. Scutellum smooth and without 

 pubescence. Elytra parallel, highly polished ; the punctua- 

 tion is moderately close, at the base very distinct, but almost 

 entirely wanting near the apex ; the extremely fine zigzag or 

 vermiculate striation, usually apparent among the punctua- 

 tion in the species of this genus, is almost entirely wanting, 

 but can be traced near the base : each elytron has two short 

 acute spines at the apex ; the outer one is scarcely longer than 

 the sutural one. The abdomen is pitchy at the apex. 



Hab. Sarayacu. 



Mallocera costifera, n. sp. 



Fusca, flavo-griseo tomentosa, opaca ; thorace tuberculis duobus 

 discalibus nigris ; elytris fuscis, costis sex flavo-tomentosis, apice 

 unispinoso ; femoribus quatuor posterioribus apice spinosis. 



Long. 17 lin. 



A rather broad flat species. Fuscous, clothed with yellowish 

 pile. Head rather large and broad ; antenna? nearly twice as 

 long as the whole insect, the joints without spines. Thorax 

 as long as its width at the base ; with two small tubercles on 

 the disk rather before the middle ; the sides with a slightly 

 swollen cicatrice before the front angle, and with a conical 

 tubercle rather behind the middle. Elytra fuscous, brownish 

 towards the apex, not very much narrowed posteriorly ; each 

 elytron with three obtuse costge, one close to the suture, one 

 near the side, the middle one not quite so long as the others ; 

 the intervals gently concave, and rather thickly but obscurely 

 punctured ; the apex of each elytron is obliquely tiumcate, 

 the outer angle produced into an acute spine. Femora some- 



