ENTOMOLOGY 



FIG. 5. 



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- 

 or seven- jointed limbs, which are 

 not inserted near the median line. 

 Eyes simple and numerous (ag- 

 glomerate in Scutigera), antennae 

 long. A pair of mandibles and 

 two pairs of maxillae. A single 

 genital opening, on the preanal 

 segment. Example, Scolopendra 



(Fig- 5).' 



Insecta (Hexapoda) . Pri- 

 marily terrestrial. Three distinct 

 regions head, thorax and abdo- 

 men. Head, with a pair of com- 

 pound eyes in most adults, one 

 pair of antennae and three pairs 

 of mouth parts mandibles, max- 

 illae and labium besides which 

 a hypopharynx, or tongue, is 

 present. Thorax with a pair of 

 legs on each of its three segments 

 and usually a pair of w r ings on 

 each of the posterior two seg- 

 ments ; though there may be only 

 one pair of wings (as in Diptera 

 and male Cocciclae) ; the pro- 

 thorax never bears wings. Ab- 

 domen typically with ten seg- 

 ments (seldom more) and without legs, excepting in some 

 larvae (as those of Lepidoptera, Tenthrediniclae and Panor- 



A centipede, Scolopendra heros. 

 About two thirds the maximum 

 length. 



