214 OMOTOTTTS. 



This insect is very nearly related to 0. tuberculatus ; it has the 

 same prominent tubercles on the thorax and near the scutellum ; it 

 is also clothed like that species with different shades of pubescence : 

 the thorax, however, is more transverse, less quadrate ; the depression 

 at the base of the thorax is more distinct, and (when viewed laterally) 

 the tubercles are more prominent and. pyramidal ; the pubescence also 

 is generally darker. 



From the district of the Amazon Eiver. In the collections of 

 Mr. Baly, Mr. Bates, and the Rev. H. Clark. 



6. Omototus Dohrnii. 



0. oblongo-ovatus, robustus, punctato-striatus, pubescens, ferru- 

 gineus ; capite brevi, inter oculos oblique foveolato ; thorace trans- 

 verso, antice elevato et bicarinato ; elytris robustis, punctato-stri- 

 atis, ante medium oblique depress is,fidvo- vel fusco-pubescentibus ; 

 antennis robustis, subtil iter dilatatis, art. 1-AJtavis, 5 et 6 rufo- 

 flavis, 6 et 7 testaceis, 8-11 jiavo-fuscis ; pedibusjlavis, femori- 

 bus posticis infra fuseo suffusis. 



Long. corp. 2-21 lm., lat. 1-11 lin. 



Oblong-ovate, robust, punctate-striate, pubescent, ferrugineous. 

 Head transverse, slightly produced, depressed at right angles to the 

 plane of the elytra ; above the labrum is a transverse triangular 

 plane ; immediately above the insertion of the antennae is a short 

 longitudinal fovea (not extending to the basal line of the head), on 

 either side of which is a minute oblique carination, made more ap- 

 parent by depressions at the inner margins of the eyes ; the eyes are 

 large and prominent, situated at the base of the head, extending 

 laterally beyond the anterior angles of the thorax ; the surface at the 

 base is finely punctate. Thorax transverse (almost quadrate), sub- 

 cylindrical ; the anterior angles depressed and obscure ; the sides 

 subsinuate and marginate ; the posterior angles are considerably de- 

 pressed, and the anterior medial disk elevated, and impressed with a 

 broad longitudinal furrow, raising the surface immediately on either 

 side of it into an oblong ridge or tubercle ; the siuface is very finely 

 and thickly pubescent. Scutellum triangular. Elytra robust, con- 

 siderably broader than the thorax ; a broad antemedial depression 

 extends obliquely upwards to the shoulders, giving an appearance of 

 prominence to the scutellary angles ; punctate-striate (the punctures 

 being entirely concealed by a thick and short pubescence) ; the colour 

 of this pubescence is for the most part ferrugineous, clouded (especially 

 near the scutellum) with dark fuscous, and interspersed (especially at 

 the oblique depression and near the suture) with irregular minute 



