178 MODERN SYSTEM. 



Genus 117. EUPLECTUS. Kirbi/, MSS. Leach, Zool. Misc. vol. iii. 

 AntenniE witli the first and second joint thick : maxillary palpi with the 



last joint conical. 

 Sp. 1. Eiip. Rcichenbachii. Leach. 

 Inhabits . Taken in Norfolk by Mr. J. Curtis. 



.StitxPS 2. — Body short and convex. 



A. Maxillari) palpi with the hat joint securiform. 



Genus 118. BYTIIINUS. Leach. Pselaphus, Family II. 'Reichen- 



hach. 



Antenna with the first joint round and considerably larger than the se- 

 cond, which is but a little increased, of the male internally acutely 

 produced ; the third and succeeding to the eighth joint round and of 

 an equal size, ninth and tenth larger, eleventh oval, the last acute : 

 maxillary palpi with the first articulation filiform, increasing towards 

 the apex; second oval, third securiform, the base with a large angle. 



Sp. 1. Rytli. Cnrtisii. 



Inhabits sand-pits. 



Genus 119. ARCOPAGUS. Leach. 

 Antemuc with the first and second joint increasing; the first elongated, 

 the second round; the third and fbllowiug to the eighth nearly glo- 

 bose; ninth increasing, nearly globose and lenticular; the tenth 

 larger ; the eleventh and remainder increasing, oval, the ai)cx of the 

 last joint acuminated : nmxillary palpi with the first joint filitorui, 

 gradually increasing to a club ; the second elongate-oval; the third 

 oval securiform, base angular. 



* AntenniE with the first joint cylindrical. 



Sp. 1. Arc.glabricollis. Leach. Pselaphus grabricollis. Reich. 

 Inhabits woods, under moss. 



** Antcnnce with the first joint internally diluted. 



Sp. 2. Arc. hulhifer. Leach. Pselaphus bulhifer. Reich. 

 Inhabits Norfolk. Messrs. Sims and Jos. Hooker. 



Genus 120. TYCHUS. Leach. 



AntenncE with the first and second joint enlarged and nearly round, the 

 first a little more lengthened and thicker than the second ; third and 

 following to the eighth nearly globose ; third and fourth a little 

 longer than the fifth, which is somewhat larger ; ninth and tenth 

 globose, increasing, and lenticular, the tenth larger than the ninth; 

 the eleventh with the others gradually increasing. 



Sp. 1. Tych. niger. 



Inhabits ? Taken near London and Bristol, as well as in tlic vici- 

 nity of Norwich. 



