108 Mr. H. W. Bates on Longicorn Coleoptera. 



bling the note of interrogation. Legs (especially the posterior 

 thighs) elongated ; like the under surface of the body, they are 

 of a dusky hue. 



This elegantly shaped and curiously marked insect occurred 

 only at Ega^ on dead branches in the forest. 



5. Alcidion olivaceum, n. sp. . 



J. oblongum, postice modice attenuatum, tomento olivaceo signa- 

 turis obscurioribus variegate vestitum : elytris apice breviter 

 oblique truncatis, femoribus crassissimis. Long. 5g lia. 



Head dusky; antennae dusky reddish, base of joints from the 

 third pallid. Thorax olivaceous grey, with a short black streak 

 in the middle of the hind margin. Elytra rather broad at the 

 shoulders, and narrowed curvilinearly thence to the apex, which 

 is briefly and obliquely truncate; the lateral carina is less pro- 

 nounced than in the last species, but the centro-basal ridges are 

 very prominent ; they are hooked behind, although not crested 

 with hairs; the surface is rather uneven, having two faint and 

 obtuse dorsal carinse, which, however, are effaced shortly behind 

 the middle ; the colour is olivaceous grey, varied with small 

 dusky spots which accompany the carinas, and two oblique discal 

 streaks placed behind the middle. Beneath and legs dusky, 

 varied with grey ; base of thighs and tip of tarsi testaceous ; the 

 thighs are short and very thickly clubbed. 



Ega, Upper Amazons. 



6. Alcidion minimum, n. sp. 



A. parvum, depressum, postice modice attenuatum, fusco-cinereum, 

 fuliginoso maculatum ; elytris apice oblique sinuato-truncatis, 

 angulis obtusis, carina centrobasali modice elevata. Long. 2 lin. 



Head sooty brown ; antennse with the basal joint strongly 

 flexuous beneath, sooty brown. Thorax smooth, sides rounded, 

 hinder part punctured. Elytra subtrigonal, depressed, with 

 lateral carinse ; centro-basal ridges moderately elevated, and not 

 abrupt posteriorly ; apex obliquely sinuate-truncate, angles not 

 produced; the surface (except towards the apex) has a number 

 of large punctures, and is of an ashy-brown colour, with a num- 

 ber of oblong dusky spots on the apical portion. Body beneath 

 and legs dusky ; base of thighs and of the first tarsal joint and 

 a ring on the tibise pale testaceous. 



Taken flying in the evening, banks of the river, S. Paulo, 

 Upper Amazons. 



The species, from its small size and general appearance, would 

 consort well with those I have placed in the genus Ozines ; but 



