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CLASS. 
VII. Order—APTERA. 
No wings. 
GENERA. 
1. GENUS—LEPISMA* 
Legs 6. Palpi moveable. 
Tails 3. Body fcaly. 
2. PODURA, SPRING-TAIL. 
A-ntennse long, taper. 
Legs 6. Eyes 2, compofed of 8 fmall ones. Tail 
forked, bent inwards under the body ; elafiic, and 
afts like a luring, by which theinfe6t leaps. 
3. TERMES. 
Antennae taper. Legs 6. Eyes 2. Mouth with 
2 jaws. 
4. PEDICULUS, LOUSE. 
Antennas length of the thorax. Legs 6. Eyes 2. 
Mouth producing a Ring. Abdomen deprefied, and 
as it were formed of different lobes. 
5. PULEX, FLEA. 
Antennas filiform. Legs 6. Eyes 2. Trunk 
taper, inflexed, concealing a Ring. Abdomen com- 
p re Red. 
6. ACARUS, TICK. 
Antennae (2 articulated tentacula) made like feet. 
Feet 8. Eyes 2, placed on the tides of the head, 
remote from each other. RoRrum pointed. 
7. PHALANGIUM. 
Antennae, fixed to the fore part of the head ; and 
made like the feet. Eight feet. Eyes two on the 
fummit of the head, near each other ; and 2 others 
on the fide. Abdomen round. 
8. ARANEA, SPIDER. 
Feet 8. Eyes 8. Palpi 2, jointed. It is furnifhed 
with infiruments for fpinning. 
9. SCORPIO, SCORPION. 
Antennae or palpi, claw's on the head. Feet* 8. 
Eyes 8. On the under fide 2 infiruments like a 
comb. 
