CLASS V. INSECTA. 
173 
division IT. — Anterior margin of the head circumscribed by a curved line, 
the antemue inserted on this side of the level of the line. Elytra covering 
half the abdomen or more. Thorax generally longer than broad, or with 
equal diameters. 
Subdivision 1 . — Maxillary palpi longer than the labial one, with their 
extremities thickest ; the lust joint obscure.. Body linear. Head with a 
dist inct neck. Thorax orbicular or cylindric. 
Genus 106. PiEDERUS. Fabr., O/iv., Lutr., Payk., T.am., Gruttnh., 
Leach. Stapuvlims. Linn., Geoff., Dc Geer. 
Antenna inserted before the eyes, insensibly thickening towards their 
extremities; the third joint very long : ryes moderately large. 
^P- 1. Pad. riparius. Body red, shining: head, antenna: (four basal 
joints excepted), apex of the abdomen, and knees, black: elytra 
blue, with white impressed dots. (PI. 4. Jig. 12.) 
b’aderus riparius. Fabr., Latr., Oliv., Gruvenh. Staphylinus riparius. 
Linn. 
Inhabits banks and under stones. 
Obs — Paderus orbiculatus is the type of the Genus Rugilus of 
Leach, 
Genus 107. STF.XUS. Latr., Cat?., Lam., Fabr., Payk., Gravenh., 
Leach. 
Antenna inserted at the exterior margin of the eyes, abruptly thicker 
at their extremities, the inferior joints cylindric, the outer ones co- 
nic globose : eyes nearly globose, large. 
* Tongue long, anus without seta. 
Sp. 1. Stenus biguttatus. Black, with gray down, minutely punctate, 
somewhat rugulose : vertex of the head with an elevated line : tho- 
rax behind with an impressed little line; each elytron with a reddish 
round spot. (PI. 4 .fig. 13.) 
htphylinus guttatus. Linn., Marsh. Stenus biguttatus. Fabr., Payk., 
Gravenh., Latr. 
** Tongue obsolete. Anus with two seta. 
Genus Dianous. Leach. 
P- 2- Stenus aerulescms. Gyllenhall. 
Subdivision 2. — Maxillary palpi not much longer than the labial, not 
thicker at their extremities ; the last joint distinct. 
A. Mandibles strong, with their external edge with one or tnore teeth. 
Head free. 
a. The second, third, and fourth joints of the tarsi very short; 
the last joint as long as the others united. 
