II SYNONYMIC AND DESCRIPTIVE NOTES ON THE 

 P^DERINI AND PINOPHILINI. 



The two tribal groups of Staphylinidse mentioned in the above 

 title, are both extremely abundant and diversified in North America. 

 The Paederini formed the subject of a recent monograph by the 

 writer (Trans. Acad. Sci. St. Louis, XV, pp. 17-248) and, of late, 

 in again going over the material which, since the date of the mono- 

 graph has been augmented by moderate accessions, some errors 

 became apparent and a few new species brought to light. These 

 errors are corrected and additional species described in the following 

 pages. 



Tribe P^DERINI. 



Synonymic Notes. 



Gastrolobium illiniane Csy., (Trans. Acad. Sci. St. Louis, XV, p. 37) 

 can be regarded a merely depauperate individual of strenuum. 



Hesperobium pacificitm and vancouveri Csy., (1. c., pp. 44 and 45) are 

 properly subspecies of calij 'ornicum. 



P&derillus texanus Csy., (1. c., p. 65) may be united with saginatiis Csy., 

 as a synonym. 



Laihrobium deceptivum Csy., (1. c., p. 83) can be united with amplipenne, 

 and procerum Csy., (1. c., p. 82) with armatum, in each case as a simple color 

 variety. The elytra in this part of the genus may be either bicolored, red 

 and black, or uniformly dark in color; but, as the bicolored examples have 

 the elytra about half red and half black, without a materially greater ex- 

 tension of the red or black so far as known, it is inferable that the species 

 are dimorphous in this respect. 



Tetartopeus agitans and nigrescens Csy., (1. c., pp. 109 and no) maybe 

 regarded as subspecies of tetricus. 



Lathrotropis relicta Csy., (1. c., p. 116) is a subspecies of jacobina. 



Paramedon mimidum Csy., (1. c., p. 173) may be united with gregale, and 

 P. distans (p. 172) may be regarded as a subspecies of gulare. 



Pseudomedon darescens and ruficolle Csy., (1. c., p. 188) maybe held to be 

 subspecies of thoracicum. This species is different from the European 

 obsolctnm, and also from the Pacific coast capitiilum, the latter being much 

 more closely related to obsoletum than are our eastern forms. 



The following species are described now apparently for the first 



time: 



184 



