gg LINNEAS SYSTEM. 
qitendy the appearance of the most highly polished gold or copP e 
the larva? live in wood. y 
Sp. 1. Bum-, biguttata. Green above, blue-green beneath ; scute* 
transversely impressed; apex of the elytra serrated ; a white v ( 
spot on each side of the suture, and three on the sides of tn 
domen. . 
In England it is rather rare, but was once observed in very b 
abundance, by Dr. Latham, in Darent-wood, Kent. 
Genus 31. Hydkophii-us, Fabr. Dytiscus, Linn. 
Antenna clavated, club perfoliate: palpi t'our, filiform: hinder feet 
ated and formed for swimming, with minute claws. ^ 
The insects of this genus live in water and moist places. 
may be seen in ponds during the summer and calm mild day 
winter, frequently rising to the surface for fresh air; they swim 
and when laid on their backs restore themselves by whirling ro 
they rest in the shade, keep in the water during the day, come au 
in the evening, and arc sometimes found sitting oil the plants t) 
ed»e; they % by night; after having been long out ot the water 
cannot dive but with difficulty: the foremost feet of the males »• 
hemispherical appendage. The larva: always live in the water, an 
die crocodiles of tlieir class, killing not only aquatic insects but 
tisnes. j 
Sp. 1. Hydroph . piceus. Black; the sternum channelled and T 
behind. 
Hydrous piceus. Leach, from the Linneen MSS. 
This is the largest British species of the genus. The larva 
still waters and ponds; is about an inch and a half in length; blac • 
head smooth and chesmit-colourcd ; with six short slender ieet, ' , 
are actually placed on the back, and a tapering tail through w“^ 
respires.— in die mondi of July it is said to attain its utmost sh® , 
leaving the water, creeps upon the dry ground to a heap of dung, ^ 
dung if it be near,) and makes a hole under it pretty deep, and f ^ 
that it can lie in it rolled up in a circle, and there it changes i” 1 ^ 
pupa state. About the middle of August the perfect insect a] 1 Ik, 
Like most of the aquatic insects it; lives through the winter, divinS 
into the mud in the most inclement weather. 
Sp. 2. IJijdroph. caraboidcs. ( PI . 3 -Jig- 16.) 
Genus 32. Dytiscus. ,| 
Antenna setaceous; palpi six, filiform: hind feet villous, lorn»« } ' 
swimming, with the claws very minute. (PL 3. fig. 13, 1*9,, 
The insects of this genus are very numerous, and are we 1 etc 
the attention of the entomologist. In Dr. Leach s system they 
vided into several very natural genera: they are found in alnio- 
