Staphylinida of the Amazon Valley. 83 



the interval between them is distinctly less than that 

 between the middle and lateral ones. 



Ega ; a single female. 



Obs. I. — This species so closely resembles C. rotun- 

 datus, that I at first supposed them to be the sexes of a 

 single species ; careful observation reveals, however, such 

 important differences, that I have no doubt these are 

 specific. C. similis is a little smaller ; it has the antennge 

 considerably shorter, the eyes smaller and less prominent, 

 the hinder angle of the elytra much less rounded, and the 

 tarsi a good deal shorter. 



Obs. II. — Besides the female individual above described 

 and named, I have a male specimen from the same locality, 

 which is slightly larger, and has the sides of the elytra a 

 little more roimded, so that I am not quite sure Avhether 

 it belongs to this species or not. I give, however, a 

 description of its sexual characters as follows. 



In the male the dorsal plate of the 7th segment of the 

 hind body ends in four almost equidistant spines, the 

 middle ones being much more elongate than the lateral ones; 

 the three spaces between the spines extend about equally 

 far towards the front ; the ventral plate has at the extre- 

 mity a broad notch, the sides of which are sinuate, and its 

 hinder angles somewhat produced, in the form of short 

 teeth. 



3. Coproporus ohesus, n. sp. Latior, convexus, piceo- 

 niger, nitidus, antennis tenuioribus pedibvisque testaceis ; 

 capite prothoraceque lfe%dssimis, elytris parce subtilissime 

 punctatis, angulo externo rotundato, intra marginem late- 

 ralem obsolete impresso. Long. corp. 2^ lin. (abdomine 

 extenso). 



Very closely allied to C. rotundatus; a little broader and 

 darker, the antennte more slender at the extremity, and 

 the sides of the elytra just a little turned outwards, so as 

 to give them the appearance of being indistinctly impressed 

 along the margin. Antenna3 long and slender, slightly 

 stouter at the extremity, yellowish, 2nd and 3rd joints 

 differing little in length ; after this the joints to the 1 0th 

 differ but little in length, the 10th being stouter and a little 

 shorter than the 4th ; it is evidently longer than broad ; 

 1 1th joint rather long. The head is blackish, smooth and 

 shining, the parts of the mouth and the palpi yellowish. 

 The thorax is very much narrowed to the front ; it is pitchy 



g2 



