CLASS V. HJSECTA. 141 
Genus 3. PETROBIUS. Leach's Zoological Miscellany, vol. iii. 
tab. 145. Lepisma. Fabr.? 
Antenna longer than the body, inserted under the eyes : maxillary palpi 
six-jointed j the fifth joint inversely conic, the sixth conic: labial 
palpi with the last joint obliquely truncate, with the apex acute, and 
not membranaceous : eyes large and contiguous. 
S P- 1. Pet. marilmus. Blackish, with golden scales: feet yellowish: 
set* of the tail annulated with white. 
Inhabits all die rocky shores of Britain. Dr. Leach first observed this 
species on die Devonshire coast, and afterwards in Ireland, Scotland, 
and Wales. It is very active, runs fast, and leaps to a great distance. 
Dr. L. suspects that it has been confounded by Fabricius w ith For- 
bicina polypoda. 
Fam. II. Podvi'.ada;. Leach. 
Palpi not exserted nor very conspicuous: antennee composed of four 
joints, the last sometimes formed of several other minute articula- 
tions : tail forked, and bent beneath die abdomen. 
Genus 4. PODURA. Linn., Geoff , De Geer., Fabr., Lam., Her- 
mann, Leach. 
Antenna: with the last joint solid, not articulated : abdomen elongate, li- 
near. 
Sp. 1. Pod. plumbea. Lead-coloured, shining, with griseous head and 
feet. 
Podura plumbea. Linn., Fabr., Latr., Leach. Podure plombee. Be 
Geer. La Podure grise commune. Geoff. 
Inhabits Europe under stones. 
There are a great number of species in this and the following ge- 
nus, which are worthy of attention. Fabricius has placed these 
two genera together without the slightest distinction, and has de- 
scribed several species, which it is hoped some future zoologist will 
he induced to examine. 
Genus 5. SMYNTHURUS. Latr., Leach. 1’odura. Linn., Fabr., 
Be Geer, Geoff. 
®P- I- Smyn. Juscus. Body entirely brown. 
La Podure brim enfuinee. Geoff. I’odura atra. Linn. ? Fabr. Smyn- 
thurus fuscus. • Latr ^ Leach. 
Inhabits Europe; is common on the ground and in damp hedges. 
Order II. ANOPLURA. Leach. 
L.viusita. Latreille. 
Bui without set* or filaments: mouth in some furnished with two 
teeth (or mandibles?) and an opening beneath; in others with a.^ 
tubulosc very short haustellum. 
1’he animals of this Order are parasitical, and were by Latreille 
