402 Mr. D. Sharp's Contributions to the 



impmictatus,antennis podibusque testaceis ; prothorace Lasi 

 medio impresso ; abdomine basi angustato. Long. corp. 

 \l lin. 



Antcnnne yellow, quite as long as head and thorax, a 

 good deal thickened towards the extremity ; 3rd joint dis- 

 tinctly longer than 2nd, and a good deal longer than 4th, 

 wliich is slender and longer than broad; of 6 — 10 each is 

 slightly longer and distinctly broader than its predecessor, 

 each a little longer than broad; 11th long, a good deal 

 longer than 1 0th. Head chestnut yellow, the hind angles 

 very rounded, the clypeus large. Thorax nan-ow, scarcely 

 so broad as the head, and not much more than half as 

 broad as the elytra ; it is longer than broad, quite convex, 

 and with an impression at the base in the middle. Elytra 

 quadrate, about as long as the thorax, of a chestnut colour, 

 rather darker than the head and thorax. Hind body 

 broad, but much narrowed at the base, so that its sides are 

 greatly rounded ; it is of a yellowish colour, Avith the apical 

 segments a little infuscatc. The legs are long and slender, 

 the four hind femora very slightly infuscatc towards the 

 extremity. 



IVIanaos ; three Individuals, captured by Dr. Trail in 

 August, 1874. They were attracted by light. 



Obs. — An undescribed species from Rio de Janeiro is 

 very closely allied to A. Icevis, but is rather smaller, has 

 joints 4 — 6 of the antennre longer, and the hind body more 

 contracted at the base. 



Omalium. 



The insignificant little species I here describe with this 

 generic name is interesting, as being the only representa- 

 tive of the Omalini yet detected in the Amazons. Indeed, 

 the group seems to be extremely poorly represented in 

 tropical America, only two species of it having as yet 

 been described from those parts, and scarcely any others 

 existing, so far as I know, in collections ; it is, however, 

 quite i)0ssible that this paucity may prove not to be so 

 complete as these facts would suggest, for our knowledge 

 of the smaller species of trojjical Stn])InjlinidcR is still so 

 very fragmentary, that no gcnerali/ation as to an exten- 

 sive group can with propriety be more than hinted at. 



1. OtiKiHiun nnnuiit, n. S]i. Subopacum, dcpressum, 

 nigrum, antcnnarum basi pedibusquc testaceis ; protho- 



