514 
INSECTS. 
joints ; palpi protruding ; abdomen having on each side a series 
of moveable appendages, and long, setaceous, articulated fila¬ 
ments.—It has two genera : 1. Machilis; and. 
Genus 2. —LEPISMA.— Linnceus. 
Generic Character. —With very small, widely separated, and 
granulated eyes ; body depressed, with three equal set® at its 
termination, inserted in the same line; feet not constructed for 
leaping. 
Lepisma saccharina .— The Saccharine Lepisma, or Wood 
Fish. 
Plate XCVII. fig. 6. 
Silvery-gray; body gradually tapering to the tail, which ter¬ 
minates in three long serrated bristles. Inhabits Europe and 
Jamaica, and destroys books. 
TRIBE II.-PODURELL/E. 
Antennae four-jointed ; mouth without distinct palpi; abdo¬ 
men divested of lateral appendages, and terminated by a forked 
tail; not constructed for leaping.—Its genera are, 3. Podura; 
and, 
Genus 4.—SMYNTH UR US_ Latreille. 
Generic Character —Antennae more slender at their extremi¬ 
ty than below, and terminating in an annulated portion; body 
globular or oval. 
Smynthurus atra. — The Black Smynthurus. 
Plate XCVII. fig. 7. 
Short, sub-globular, with elongated antennae; glossy black. 
Inhabits the bark of trees in Britain. 
ORDER II.—PARASITA. 
Destitute of wings, and provided with six feet; abdomen 
without articulated and moveable appendages; having two or 
four small eyes; the mouth of many species placed interiorly, 
with an external proboscis or nipple, acting as a sheath to a re- 
