Stophylinida: of the Amazon Valley. 373 



Antennae j-ellow, elongate and slender ; 3rd and 4th 

 joints of abont the same length. Palpi pale yellow. Head 

 broad and short, about as broad as the elytra ; the eyes 

 separated by a broad space, which is distinctly depressed, 

 and closely and coarsely punctured, but in the middle the 

 punctures become sparing, so as to leave an irregular longi- 

 tudinal shining space ; on the underside the gen^e are 

 very broad, and densely and coarsely punctured. Thorax 

 much longer than broad, greatly narrower than the elytra, 

 subcylindric ; very slightly rounded at the sides, very 

 densely, coarsely and deeply punctured, so that the inter- 

 stices are rugose and very narrow. Elytra about as long 

 as the thorax, broad, outstanding, the humeral angles 

 strongly marked ; the surface coarsely and deeply punc- 

 tured, the punctures rather close, but the interstices broad 

 and shining. Hind body cylindric and elongate ; the 

 segments coarsely and closely punctured, the 6th towards 

 the extremity sparingly and finely, the 7th obsoletely 

 punctured. Legs yellow, elongate, moderately stout ; the 

 knees reddish. 



Para; a single female. 



Ohs. — This species, as w^ell as S.genalis, is remarkable 

 from the broad, very densely and coarsely punctured 

 gcna\ 



19. Stenus tricolor, x\. sp. (Sect. II. B, Er.) Elongatus, 

 angustulus, nitidus, viridi-asneus, abdomine rufo-testaceo, 

 apice abrupte nigro ; antennis rufis, basi cum palpis pedi- 

 busque flavis. Long. corp. 2^ lin. 



Antennae elongate and slender, pale yellow at the base, 

 darker towards the apex ; pal]n pale yellow. Head broad, 

 not excavate, but the middle slightly elevated, and between 

 this and the eye with a small depression on either side ; 

 the antennal tubercles elongate, the punctuation sparing 

 and irregular. Thorax longer than broad, narrower than 

 the elytra, subcylindric, but distinctly broadest in the 

 middle, and the basal portion slightly contracted; shining, 

 rather coarsely and not sparingly punctured, the basal 

 portion with a smooth space along the middle. Elytra 

 slightly longer than the thorax, rather narrow and elongate ; 

 the shoulders rectangular and sharply marked; the colour 

 shining-green like the thorax ; the punctuation coarse, 

 moderately close. Hind body elongate, slender and cylin- 

 dric ; reddish, shining ; the basal segment distinctly, the 



