230 
Observations on the various Insects 
mined, and when dead it greatly resembles J. piilchellus in colour. 
I have never seen it alive ; but thousands were infesting a garden 
at Namptwich, and a small box full was forwarded to me. 
21. Julus pilosus, JVeivjwrfs ]\fSS., the hairy Snake-millipedcj 
is nearly an inch long, rather slender, cylindrical, lead-coloured, 
slightly pilose, the margins of the segments being striated and 
somewhat ciliated, the penultimate segment is mucronated ; the 
lobe is pointed, and projects beyond the terminal joint, which is 
brown and hairy; there is a line of black dots down each side; 
the thoracic segment, head and antennae are brown : these last are 
rather long, slender, very pubescent, and slightly clavate ; the 
fifih joint is nearly as long as the second. 
This very distinct species stands in the British Museum with 
the above appropriate name, being distinguished from all the 
others by the hairs scattered over its entire length. I have found, 
it more than once infesting the roots of cabbages in gardens in 
March. 
There is one more species which belongs to the Gknus Polv- 
DESMUS of Latreille. It is essentially distinguished from the Juli 
by the apparent absence of the eyes, as well as by its flauene<l 
back, the segments being a litile dilated or margined on the 
sides, and the hinder angles of each are acute ; the tail is mu- 
cronated, and it has only between sixty and seventy legs : the 
antennae are seven-jointed, the basal joint being subglobose ; 
second, ovate; the third is by far the longest; the two following 
are elongate, clavate, and truncated ; the sixth is stouter and ovate, 
forming a little club ; the seventh is small (d) ; the species is 
named 
22. Polydesmus complanatus, Linnceus, the flattened millipede 
(fig. 55). It is of a pale lilac colour above ; the back is granu- 
lated ; the belly is whitish ; the legs are more or less ochreous. 
It is generally from \ of an inch to 3^ lines long (c), but when 
arrived at maturity some specimens are as large as fig. 55. 
This is reported to be by far the most destructive species. In 
April considerable numbers of the smaller ones were detected 
eating the roots of wheat, and in the spring and autumn they wei-e 
injuring the roots of onions and pansies. They propagate rapidly 
where the earth is undisturbed ; and specimens measuring three- 
quarters of an inch have been found under garden pots at the rupts 
of anemones. In a systematic arrangement Polydesmus forms a 
natural transition from the snake-millipedes to the centipedes, 
called Scolopeudra;, the habits of all being similar; but as the 
numbers of the latter family are comparatively insignificant, and 
they are said to live like the earth worms upon the soil nlone — 
which, however, I very much doubt — it appears to be unnecessary 
to enter farther into their economy. 
