StapliyUuidcB of the Amazon VaLleij. 3G7 



In the male there is a moderately large excision at the 

 extremity of the ventral plate of the 7th segment ; the Gth 

 is flattened and sHghtly depressed along the middle, finely 

 punctured and very delicately pubescent, and its hind 

 margin is a little emarginate ; the hind margin of the 5th 

 segment is obscurely emarginate. 



Anana; a single i found by Dr. Trail on Gth Sep- 

 tember, 1874. 



11. Stenus liedator, n. sp. (Sect. II. A, Er.) Niger, 

 dense punctatus, subopacus, palpis, pedibus, antennisque 

 testaceis, his apice nigricantibus; capite elytris fere latiore, 

 fronte sat excavata ; abdomiue fortiter, minus crebre punc- 

 tate, subnitido. Long. corp. 2 lin. 



Antennte long, slender, yelloAV, with the three or four 

 apical joints blackish; 3rd joint elongate, twice as long as 

 2nd, and a good deal longer than the 4th ; 7th and 8th 

 joints slender and elongate, scarcely at all thicker than 

 the preceding ones, 9 — 11 also slender and elongate, but 

 distinctly stouter than the others; 11th almost as long 

 but scarcely so broad as 10th. Palpi elongate, pale 

 yellow. Head with the eyes very large, a little broader 

 than the elytra ; the space between the eyes is distinctly 

 depressed, but obsoletely bisulcate, rather coarsely but not 

 evenly punctured, with a small, shining, smooth space at 

 the vertex in the middle. Thorax a good deal narrower 

 than the elytra, a little longer than broad; the sides a good 

 deal rounded in front, and distinctly narrowed behind the 

 middle; it is coarsely, very densely and qiute rugosely 

 punctured, so as not to be shining. Elytra broad, scarcely 

 longer than the thorax, very coarsely, densely and rugosely 

 punctured, not shining. Hind body rather slender, Avith 

 the sides finely but distinctly margined ; it is rather coarsely 

 and distinctly and not closely punctured ; it is distinctly 

 shining, and there are no carinas in the impressions on the 

 base of the segments. The legs are yellow, the tarsi 

 elongate ; the hind tarsus has the basal joint very long, 

 quite as long as the three following together ; the 2nd 

 joint is also elongate, and about half the length of the 

 basal one, the lobes of the 4th joint are elongate and 

 slender. The under surface is shining and coarsely 

 punctiu'ed. 



In the male the femora are rather stout, and the hind 

 tibia3 at their apex are a little iucrassate, and with a minute 



