376 Mr. D. Sharp's Cuntrihutions to the 



closely punctured, except on the elevation. Thorax rather 

 longer than broad, much naj-rower than the elytra, the 

 basal ])ortion distinctly contracted, and the sides narrowed 

 towards the front; the surface closely and moderately 

 coarsely punctured, with a small spot behind the middle 

 free from punctures. Elytra largely develoi)ed, much 

 longer and broader than the thorax, slightly depressed 

 Avithin the prominent shoulders, rounded and contracted 

 towards the extremity, densely and coarsely punctured. 

 Hind body broad at the base, and gradually narrowed 

 towards the extremity ; rather closely and moderately 

 coarsely punctured, with a fine, distinct, depressed pubes- 

 cence. Legs ])itchy, the base of the tibife yellow ; tarsi 

 pitchy-yellow, slightly paler at the base. Gena3 rather 

 s])aringly punctured. 



The male has a very broad notch at the extremity of the 

 7th segment ; the 6th segment is flat along the middle, and 

 finely pubescent, scarcely emarginate at the hind margin. 



Tapajos ; a single male. 



23. Stenus colhiris, n. sp. (Sect. II. B, Er.) Niger, 

 nitidus, glaber, antennarum basi, palpis pcdibusque rufes- 

 centibus; fi-onte area media lata Itevi ; prothoraee medio 

 ampliato, fortiter sat crebre punctato, disco hevi ; elytris 

 fortiter sat crebre punctatis. Long. corp. fere 2 lin. 



Antennae only moderately long, pitchy, Avith the two 

 basal joints yeUow, and the following ones intermediate 

 in colour ; 3rd joint a good deal longer than 4th. Palj)i 

 elongate, yelloAV, the last joint dusky yellow. Head broad, 

 but narrower than the elytra, only sparingly punctured, a 

 broad space in the middle being cpiite smooth and even, 

 outside this the punctures are but sparing ; the front is 

 not excavate, but there is an impression on each side of 

 the smooth central place ; the antennal tubercles are very 

 small. Thorax about as long as broad, much narrower 

 than the elytra, a good deal broader in the middle than at 

 the front and base ; coarsely but rather sparingly ])unc- 

 tured, the punctures most luunerous near the front margin ; 

 a broad space on the middle impunctate. Elytra broad, 

 the shoulders prominent, rather longer than the thorax, 

 coarsely but sparingly punctured. Hind body broad at 

 the base, but much narrowed towards the extremity ; seg- 

 ments 2 — 5 transversely depressed near the base in the 

 middle, and a little contracted at the sides: rather 



