IN SECTS. 
523 
Genus HEL O P S. — Fabricius. 
Generic Character. — Antennas filiform, somewhat longer than 
the thorax, composed of eleven joints, of which the last three 
are short and round ; mandibles bifid at their extremity ; palpi 
four; last joint of the maxillaries securiform •, labium slightly 
notched ; chin nearly square. 
Helops violaceus. — The Violet Helops. 
Plate XCVIII. fig-. 10. 
Head, thorax, and elytra, violet-coloured; legs and antennas 
gray. Inhabits Britain, on the bark of trees in sandy situations. 
TRIBE IV.-T RACHEL IDES. 
With a triangular heart-shaped head, and detached from the 
thorax; antennae simple, flabelliform, pectinated, or serrated; 
jaws devoid of corneous teeth on the internal side; he 's ot 
the tarsi entire, the penult joint having a double lobe Li most 
of the species. 
Genus MORDELLA.— Linnaeus. 
Generic Character. — The tarsi having all their joints entire ; 
the maxillary palpi ending in a larger joint than the preceding, 
and dolabriform ; antennae simple or serrated; last segment of 
the abdomen prolonged into an acute point in the females. 
MordeUa aculeata. — The Aculeated Mordella. 
Plate XCVIII. fig. 15. 
Dusky-black and shining, spotless, invested with silky down ; 
antennae serrated; the female with the last abdominal segment 
prolonged into a point; ovipositor the same length as thorax. 
Inhabits gardens in Britain. 
Section III.— Tetramera —All the tarsi having four joints. 
TRIBE I.-RHYNCHOPHORA. 
Head anteriorly prolonged in the form of a rostrum, and 
having a terminal mouth, or into a proboscis ; antennae in most 
of the species claviform, geniculate, and inserted on the pro¬ 
boscis ; abdomen large ; penult joint of the tarsi generally 
bilobed. 
