88 CLAVICORNIA. [Pselaphns. 



P. dresdrenals, Herbst. Very like the preceding in general appear- 

 ance but darker, and easily distinguished by the shape of the thorax, 

 which is broader in proportion, and not much longer than broad, and is 

 furnished with a distinct longitudinal semicircular impressed line at 

 base ; the second joint of the antennae is almost equal to the third, and 

 the last joint is ovate and smaller, instead of almost securiform and larger 

 as in P.Heisei ; the pubescence also at the apex of the elytra is shorter ; 

 the two species differ also in the sculpture of the metasternuin in the male, 

 but the sexual characters do not appear to be important. L. If -2 mm. 



In damp localities, in moss, &c. ; extremely rare, and usually occurring singly ; The 

 Holt, Farnham, one specimen (Power) ; Askliam Bog, York, where Archdeacon Hey 

 used to take about one specimen yearly from the moss at the side of the stagnant 

 pools; Scotland, very rare, Tweed district. Denny used to take it very sparingly at 

 Woodbastwick and Loddou in Norfolk (Mon. Pselapb. et Scydin. I3rit., page 48.) 



TYCHUS, Leach. 



This genus contains forty or fifty species from various parts of the 

 world ; they differ from Pselaplius in the formation of the palpi and 

 general shape, and from Sytliinus in the relative length of the segments 

 of the abdomen ; we possess one British species, the insect that has been 

 introduced as Tychus ibericus being a variety of T. niger with reddish 

 elytra. 



T. nig-er, Payk. Black, with the antennaa and legs reddish tes- 

 taceous, elytra sometimes chestnut brown or reddish, at all events on 

 disc ; head triangular with large and prominent eyes ; antennso stout, 

 rather long, with the first joint about as long as the second, last three 

 joints forming a strong club ; maxillary palpi yellow, last joint securi- 

 form ; thorax somewhat broader than long, convex, with five largo 

 punctures at base; elytra much broader than thorax, convex sub- 

 quadrate, with an entire sutural stria ; abdomen with the first visible 

 dorsal segment longer than the following which are gradually narrower, 

 sparingly pubescent with long out-standing setae ; legs long, especially 

 the posterior pair, femora sometimes infuscate. L. 1| mm. 



Male with the 5th joint of the antennae strongly dilated, about three 

 times as broad as those contiguous to it. 



In moss, dead leaves, baystack refuse, &c. ; generally distributed and common in 

 the Southern and Midland districts of England, but I icannot find any record from 

 further north than Manchester, and it does not appear to occur in Scotland; Ireland, 

 near Belfast and Armagh. 



BYT3SINUS, Leach. 



In the Munich catalogue forty-seven species only of this genus are 

 enumerated (including those belonging to the genus Machserites) ; in the 

 catalogue of Heyden, Reitter and Weise, more than a hundred species 

 arc mentioned from Europe alone ; it is evident therefore that our 

 of it is very limited; species have been described from 



