CLASS VIIle ORDERS Il. tf. & Iv. 99 
the number of segments of the body on each side ; 
feelers two, setaceous. 
ORDER 2. THYSANOURA. 
Having but sia feet, with some other organs of 
movement, which appear like fringes ; no wings. 
Lerisma, (lepisma,) legs six, formed for run- 
ning; mouth with two setaceous and two headed 
feelers ; body imbricate with minute scales ; tail 
furnished with extended bristles. 
Popura, (spring-tail,) legs six, formed for run- 
ning ; eyes two, composed of eight; tail forked, 
formed for leaping, inflected 5; antenne setaceous, 
elongated. ; 
ORDER 3. PARASITA. 
Having sia feet, no fringe-like organs ; no 
wings ; crawl upon other animals. 
Pepicutus, (louse,) legs six, formed for walk- 
ing ; mouth furnished with an exsert piercer 3 an- 
tenne the length of the thorax ; abdomen depress- 
~ ed, sublobate. 
ORDER 4. SUCTORIA. 
No wings ; beak a sucker enclosed ina cylin- 
dric sheath of two articulated pieces. 
Puvex, (flea,) legs SiX, formed for leaping : 
eyes two; antenne filiform; mouth furnished 
with an inflated, setaceous snout, concealing a pier- 
cer, abdomen compressed. | 
