178 MODERN SYSTEM. 



Genus 117. EUPLECTUS. Kirby, MSS. Leach, Zool. Misc. vol. iii. 

 Antenme with the first and second joint thick : maxillary palpi with the 



last joint conical. 

 Sp. 1. Eup. Rcichenbachii. Leach. 

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



Stiups 2. — Body short and convex. 



A. Maxillary palpi with the last joint securiform. 



Genus 118. BYTHINUS. ieacA. Pselaphus, Family U. Iteichen- 



bach. 



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 : 

 viaxillary palpi with the first articulation filiform, increasing towards 

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



Sp. 1. Byth. Curtisii. 



Inhabits sand-pits. 



Genus 119. ARCOPAGUS. Leach. 

 Antenna: with the first and second joint increasing; the first elongated, 

 the second roimd; the third and followiog to the eighth nearly glo- 

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

 larger; the eleventh and remainder increasing, oval, the apex of the 

 last joint acuminated : maxillary palpi with the first joint filiform, 

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

 oval securiform, base angular. 



* Antenna with the first joint cylindrical. 



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

 Inhabits woods, under moss. 



** Antenntp with the first joint internally dilated. 



Sp. 2. Arc. bulbifcr. Leach. Pselaphus bulbifer. Reich. 

 Inhabits Norfolk. Messrs. Sims and Jos. Hooker. 



Genus 120. TYCHUS. Leach. 



Antenna 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. 



Inliabits ? Taken near London and Bristol, as well as in the vici- 

 nity of Norwich. 



