CLASS V. INSECTA. 
185 
*** Elytra externally striated. Body without punctures. 
Sp- 3. Plat, depressum. Leach. H. depresses, Marsh. 
Subdivision 3 . — Antenna straight, not inserted in the cavity of the eyes. 
• Feet semkontractile. 
Genus 139. LIMNIUS. Muller, GylL, Leach. Dytiscus. Pam. 
Ciirysomela. Marsh. Elmis. Latr. 
Antenna nearly filiform, the last joint largest, somewhat oval. 
%>• t. Lint. Volckmari. Leach, 
dytiscus Volckmari. Panzer. 
^hrysomela buprestoides. Marsh. 
Fam. XVIII. Parnid.*. Leach. 
Antenna inserted in the anterior canthus of the eye : elytra not shorter 
than the abdomen. 
Genus 140 . PARNUS. Fubr., Itlig., Marsh., Leach. Dermestes. 
Geoff. E LATER. Rossi. Havocs. Oliv., Lam., Latr. 
Antenna composed of three joints, the last joint articulated : tarsi with 
five joints. 
Ons. — The insects of this genus inhabit the roots and blades of grass 
at the sides of ponds and ditches; the method of finding them is 
to loosen the grass in those places, by which means the insects will 
he found floating on the water : we have several species in tilts 
country that have not yet been clearly defined, but have been con- 
founded with prolifericornis. 
Sp. 1. Par. scriccus. Leach’s MSS. [PI. 3. fig. 10. a. antenna magni- 
fied) 
Genus 141. HETEROCERUS. Bose., Fair., Illig., Latr., Marsh., 
Leach. 
Antenna composed of eleven joints, the seven last forming a dentate 
or serrated mass : tarsi with four joints. 
S P- 1. Ret. marginatus. Blackish villose; sides of the thorax and ab- 
domen with spots on the elytra, margins of the abdomen, and feet 
pale iuteous. (Pi. 3. fig. H-) 
inhabits marshy places, burrowing in the muddy and clayey banks of 
Ponds. 
Fam. XIX. IIelofhorim;. Leach. 
Alandibles without teeth at their extremities: Jody oblong: antenna 
terminated by a club. 
St 'Rps l ,—CIypeus whole : maxillary palpi with the last joint thick and 
oval. 
