338 



ZOOLOGY. 



three pairs of feet, and in this and other respects resembles 

 Podura. A second form, Eurypauropus, of Ryder, has sis 

 segments, vith nine pairs of feet wholly 

 concealed from abore by the expanded seg- 

 ments. The antennas end in a terminal 

 globular hyaline body with a long pedicel, 

 as in Pauropus, and the mouth-parts are 

 as in that genus. E. spinosus Eyder is 

 reddish brown, and one mm. in length. 



Order 3. Chilopoda. — This group is rep- 

 resented by the centipede and LithoMus, 

 in which the body is flattened, the sternal 

 region being well developed. In Geophilus 

 Tig. 303, G. Mpuncticeps Wood) and allies 

 there are from thirty to two hundred seg- 

 ments. Our most common form is Litho- 

 bius Americanus Xewport, found under 

 logs, etc. The centipede yScolopendra 

 lieros Girard) is very poisonous, the poison- 

 sac being lodged in the two large fangs or 

 fir=t pair of legs. In Cermatia the body is 

 short, with compound eyes and remarkably 

 long slender legs. 0. forceps Uafinesque, of 

 Southern States, is said to be poisonous; it 



Fig. 304. — Pauropus 

 LviSockii. >lnch en- 

 larged. Pig. 305 en- 

 larged view, of head 

 and antennfe and Out 

 pair of feet. 



the Middle and 

 preys upon spiders. 



Glass III. — Akachxida {Spiders, etc.). 



Characters of Arachnida. — The bodies of spiders and scor- 

 pions, etc., are divided into two 

 regions, a head-thorax and abdomen, 

 the head being closely united with 

 the thorax. There are no antennae, 

 only a pair of mandibles and a pair 

 of maxillae, with four pairs of legs. 

 There are never any compound eyes. 

 The young are usually like the adult, 

 except in the mites, in which there 

 is a slight metamorphosis. In all 

 Arachnida there is a liver, this organ not being present in 

 the winged insects. 



