404 
ME. A. D. MICHAEL OH 
This species is closely allied to tlie Chorioptes setiferus, var. 
hyence of Megnin ; there are, however, well-marked specific dif- 
ferences. 
I have adopted G-erlach’s name of Symbiotes for the genus in 
preference to Gervais’s name of Chorioptes , which Megnin has 
employed, because Gerlach’s is the earlier, and Megnin appears 
to have used Chorioptes under a misapprehension. Megnin says 
that Gerlach’s name has priority, but he says that it fails because 
Redtenbacher had already called a genus of Coleoptera by that 
title ; this, however, seems to he an error. Gerlach’s name was 
published in his monograph in 1857, whereas Redtenbacher’s 
genus was in his £ Rauna Austrise’ in 1858; it is therefore the 
latter genus which fails, not Gerlach’s. 
I have, unfortunately, not been able to obtain the adult male. 
Female. — Body irregularly pentagonal, broadly truncated pos- 
teriorly ; considerably wider anteriorly than posteriorly ; anus 
projecting from the hind margin. Body almost white, semitrans- 
parent ; rostrum, epimera, and legs strongly chitinized and brown. 
Birst and second pairs of legs thick and strong ; the tarsus of 
each of these legs has a strong hair or rod springing from its 
upper surface in the median line ; this hair is of almost equal 
thickness throughout, and ends quite bluntly, it stands upward 
and is considerably longer than the tarsus. These tarsi are ter- 
minated, as usual, by suckers. The epimera of these two legs nearly 
join at their posterior ends. The third pair of legs are much 
smaller, not above half the length ; they are terminated by three 
very long hairs of unequal lengths, the longest is more than twice 
the length of the body. The fourth legs resemble the third, but are 
so small as to appear quite rudimentary ; they are not above half 
the length of the third pair, they also are terminated by three 
long hairs, but these are small and short compared with those on 
the third pair. The body bears two pairs of very long hairs on 
the hind margin, the outer hair of each pair is considerably longer 
than the inner, the outer hair is longer than the body. The vulva 
is a rounded median depression, towards which the striae of the 
skin run from all sides, as in S. setiferus. 
The Nymph. — Resembles the adult female, but, of course, is 
smaller and less chitinized. 
Habitat. I found the species upon the hedgehog ( Frinaceus 
europceus). It is very active, running up and down the spines of 
the hedgehog with great rapidity. 
