230 Mr. G. Lewis on 



base ; the mesosternum is eniarginate, with a curved stria on 

 either side, and the spaces before and behind the striae are 

 punctate ; the anterior tibiai 5-dentate. 



The stride on the prosternal keel are well-marked and com- 

 plete and are a good distinguishing character for the species, 

 which in outline corresponds with 0. grossus. Mars. 



Ilab. Rio Cachiyaeu, Iquitos [Stuart, 1893). 



Omalodes sinuaticollis, Mars. 



This species has two conspicuous fovese in the elytra at 

 the base of the third dorsal stria, I believe the type of this 

 species came to me in the Chevrolat collection ; in it the pin 

 pierces the fovea on one side, and probably Marseul thought 

 the fovea on the other accidental. I have received fresh 

 specimens lately from Mr. H. H. Smith taken at Rio Janeiro. 



Hister congoniSj sp. n. 



Breviter ovalis, depressiusculus, niger, nitidus ; fronte punctulata, 

 antice foveolata, stria transversa utrinque deflexa tenuiter im- 

 pressa ; thorace stria externa abbreviata, interna Integra ; elytris 

 striis 1-3 integris, 4 basi evanescent!, sutnrali basi abbreviata ; 

 pygidio vix dense punctate, postice marginato ; tibiis anticis 

 4-dentatis. 



L. vix 6 mill. 



Shortly oval (elytra wider than the thorax and widest 

 behind the shoulder), somewhat depressed, black and shining ; 

 the head punctulate and foveolate anteriorly, stria fine and 

 nearly straight across the fovea, and then it is markedly 

 deflected on either side, in front of each eye there is a remark- 

 able obtuse projection, mandibles are concave above, with a 

 very robust tooth on the inner edge, labrum is transverse and 

 semicircular on the anterior edge ; the thorax is transverse, 

 M-idest at the base, marginal stria ceasing behind the eye, 

 outer lateral is somewhat hamate at the anterior angle and 

 posteriorly it reaches a little beyond the middle, inner lateral 

 is strong at the sides, slightly sinuous, and it is much nearer 

 the edge behind the neck than behind the angles ; the elytra, 

 strise, inner humeral is deep and apical and reaches beyond 

 the middle, apically it nearly joins the first dorsal, dorsal 

 1-3 complete, 4 evanescent at the base and rather fine, 5 

 dimidiate, sutural well shortened at the base and bending 

 away from the suture before and behind ; the propygidium 

 is not closely punctured and the points vary in size, those 

 on either side are the largest, some are very minute; the 



