4 ENTOMOLOGY 
short, mouth parts consisting of a pair of mandibles and a 
compound plate, or gnathochilarium. Genital openings sepa- 
rate, anterior in position (on the second segment of the body). 
Example, Spirobolus (Fig. 4). 
Chilopoda.—Terrestrial. Two regions, head and_ body. 
Body long and flattened, with numerous segments, each of 
which bears a pair of long six- 
Eien: or seven-jointed limbs, which are 
not inserted near the median line. 
Eyes simple and numerous (ag- 
glomerate in Scutigera), antennz 
long. A pair of mandibles and 
two pairs of manxille. A single 
genital opening, on the preanal 
segment. Example, Scolopendra 
(Pigs ). 
Insecta (Hexapoda). — Pri- 
marily terrestrial. Three distinct 
regions—head, thorax and abdo- 
‘to'a" 
men. Head with a pair of com- 
pound eyes in most adults, one 
pair of antennze and three pairs 
of mouth parts—mandibles, max- 
ila and Jabium—besides which 
a hypopharynx, or tongue, 1s 
sett | 
W 
at 
ad " 
d 
md 
present. Thorax with a pair of 
legs on each of its three segments 
and usually a pair of wings on 
each of the posterior two seg- 
ments; though there may be only 
one pair of wings (as in Diptera 
A centipede, Scolopendra heros. and male Coccide); the pro- 
About two thirds the maximum ‘ 
Reith: thorax never bears wings. Ab- 
domen typically with ten seg- 
ments (seldom more) and without legs, excepting in some 
larvee (as those of Lepidoptera, Tenthredinidz and Panor- 
