50 Mr. H. W. Bates on the Longicorn Coleoptera 



one longitudinal behind. Elytra tapering slightly from base 

 to apex, the tips rather obliquely and briefly truncated, the 

 external angles of the truncature slightly produced ; the basal 

 half studded with acute granulations accompanied by punctures, 

 and in the centre of each, near the base, is a large, obtuse, 

 transverse elevation, dark brown in colour: they are clothed 

 with fine silky changeable olive-grey pile, and are variegated 

 from the middle to the apex with tine grey and fuscous strongly 

 undulating lines, with a grey patch on each side near the 

 middle spotted with black. Under-sui-face of the body clothed 

 with golden-grey pile. Legs greyish olive, with paler rings. 



One individual, taken atEga. This and the following species 

 resemble much in colour and design Acrocinus trochlearis and 

 accentifer. 



2. Oreoderafl,uctuosa,n.%^. 



O. elongata, depressa, tomento tenuissimo holosericeo cinereo vestita : 

 elytris apicibus oblique truncatis et spinosis, plaga laterali pone 

 basin, strigisque undulatis numerosis fuscis. Long. 10 lin. $ . 



Head and thorax grey : eyes nearly touching the central 

 furrow on the vertex. Antennae grey, apex of each joint from 

 the third dusky. Thorax with the two anterior discoidal tubercles 

 very prominent, the posterior one nearly obsolete. Elytra 

 slightly tapering, the tips rather obliquely truncated, the ex- 

 ternal angles produced, dentiform ; in the middle, near the base, 

 each has a large prominent dark-brown tubercle ; the basal half 

 is somewhat sparingly granulate-punctate : ashy grey in colour ; 

 across, near the base, is a broad yellowish- grey belt, and on the 

 margins behind the shoulders a long oblique dark-brown patch ; 

 there are also two transverse, narrow, strongly undulated belts 

 of the same dark-brown colour, — one behind the middle, the 

 other near the apex. Legs grey, femora varied with dusky; 

 two rings on the tibise and claw-joint of the tarsi black. Under- 

 surface of the body densely clothed with a golden-grey pile. 



One example, taken at Para. I believe it is also found at 

 Cayenne. 



3. O. glauca, Linn. 



Ceramhyx glaucus, Linn. Syst. Nat. ii. 626. 28. 

 Lamia glauca. Fab. Ent. Syst. ii. 274. 27. 

 Spengleri, Fab. Ent. Syst. ii. 291. 93. 



This is a very common insect throughout the Amazon region 

 as well as at Cayenne. It is found on the trunks of felled trees 

 of one or more species of Inga, the bark of which it resembles in 

 colour. The lateral tubercles of the thorax have indications of 

 the same impressed line around them which is so strongly 

 marked in the Acrocini. In the 6 the fore legs are elongated ; 

 the tibiae bent, rather hooked at the apex on the inner side. 



