INSECTA, 325 
MYRIOPODA 
CENTIPEDES. MILLIPEDEs. 
CHILOPODA, DipLopopa (or CHILOGNATHA). 
Carnivorous. Vegetarian. 
Harmless. 
popes: 
ody usually flat. 
One pair of appendages to 
each segment. The stigmata do 
not correspond in number to the 
segments; they often occur on 
alternate segments. 
Many-jointed antennz. 
Toothed cutting mandibles. 
| Two pairs of maxille, usually 
with palps. 
Body cylindrical. 
By the imperfect separation of 
the segments, all but the first three 
behind the head seem to have two 
pairs of appendages each, and also 
two paired ganglia, and two pairs 
of stigmata (tracheal openings). 
Seven-jointed antenne. . 
Broad masticating mandibles. 
A pair of maxille fused in a 
broad plate, usually four-lobed. 
No poison claws. 
| he first pair of legs modified: 
as poison claws. — 
ee 
A single genital aperture on the 
| second last segment. 
Examples. —Scolopendra, 
Lithobius, 
Geophilas. 
teriorly. 
Examples.— /zlus. 
Polyxenus. 
Glomeris. 
More 
Genital apertures open ap- i, 
In the order Symphyla (Scolofendrella) there are not more than 
twelve segments, and there is only one pair of trachez, which open on 
the head. Scolopendrella is in several ways like the primitive insects 
known as Thysanura. In the order Pauropoda (Fauropus), there are 
ten segments, and the antennz are branched. 
Third Class of Tracheata Antennata.—INSECTA 
Insects occupy a position among the backboneless 
animals like that of birds among the Vertebrates. The 
typical members of both classes have wings and the power 
of true flight, richly aerated bodies, and highly developed 
respiratory, nervous, and sensory organs. Both are very 
active and brightly coloured. They show parallel differ- 
ences between the sexes, and great wealth of species within 
a narrow range. 
