Staphylinida of the Amazon Valley. 127 



the apical portion of each segment ; the 6th rather more 

 sparingly punctured than the preceding one. Legs black ; 

 front tarsi with the apical joints reddish, and clothed 

 beneath with tawny hairs. 



In the male the hind margin of the A-entral plate of the 

 7th segment is emarginate in the middle, and in front of 

 the emargination the surface is shaved away so as to 

 form an angular depression. 



Para, one specimen, <? ; Ega, one ? . 



Ohs. I. — This species closely resembles the preceding 

 one, but is decidedly narrower, and has the head and the 

 thorax and the 6th abdominal segment less densely punc- 

 tured, and the male characters different ; besides the ex- 

 ternal differences, I may add that the apical portions of 

 the aideagus are very much less elongate than in X. sap- 

 phirinus. 



Obs. II. — Besides the specimens above mentioned, I 

 have several other individuals from Tapajos, Ega and 

 St. Paulo, which are, perhajss, varieties of this species, 

 but as they are all females I cannot speak certainly : they 

 are generally a little larger than the individual described, 

 in two of them the elytra are more purple, and in the 

 larger specimens the head and thorax are more coarsely 

 punctured, and the antennte a little stouter. I have also 

 a male individual, found by Mr. Buckley in Ecuador, 

 which I have no doubt is conspecific with the Para male 

 from which I have drawn up my description ; this speci- 

 men has the hind margin of the 6th segment underneath 

 a little emarginate in the middle ; this point I cannot 

 ascertain for the Para individual, as just that part of the 

 specimen is slightly broken. 



Ohs. III. — I have named this species in honour of 

 Mr. Solsky, of St. Petersburg, who has of late years 

 published the descriptions of many interesting species of 

 South American Staphylinidce. 



3. Xanthopygus cyanipennis, n. sp. Niger, nitidus, 

 antennis testaceis ; elytris cyaneis, abdomine segmento 6° 

 dimidio apicali, segmentoque 7° toto rufo-testaceo. Long. 

 Corp. 7 lin. 



Mas : segmento 6° ventrali margine apicali medio 

 obsolete emarginato, segmento 7*^ sat profunde triangu- 

 lariter emarginato. 



Allied to X. sapphirinus, but considerably narrower, 

 the punctuation of head and thorax much more sparing. 



