450 



ARTUIWPODA. 



second ' thoracic ' somites, a condition which deserves embryologi- 

 cal investigation. The abdomen consists of niae or ten somites, 

 and the head bears two ocelli. 



As the name implies, the Solpugidse are nocturnal, living by day in 

 holes in the sand and searching for their prey at night. In Ihe Old World 

 they are reputed as poisonous, but no poison glands occur. "Warmer parts 

 of U. S. Solpiiga* Qaleodes* Datamea * (fig. 464;. 



Fig. 464. Fig. 465. 



Fig. 464. — Daiames formid/bili.t* (After Putnam.) 



Fig. 465. — Chelifer bravaiai. (From Sctiiiiarda.) i, chelicerse; 5, pedipalpi. 



Order V. Pseudoscorpii. 



These small forms resemble the true scorpions in the chelate 

 cheliceraj and pedipalpi (fig. 40.5), and in the abdomen joined by 

 its whole breadth to the thorax. They differ in the lack of post- 

 abdomen and sting. They breathe by trachea?; have from two to 

 foitr ocelli, and spinning glands opening on the second abdominal 

 somite. 



These animals, 2-3 mm. long, live in moss, etc., and among old and 

 dusty books, where they feed on mites and minute insects. Their bodies 

 are flattened and they run sidevviso. C/ielefer,* Obisium,* Chei-nes.* 



Order VI. Phalangida. 



The abdomen in the harvcstman, or 'daddy long legs,' is less 

 evidently segmented than in tlie forms already mentioned, nor is 

 it sliarply distinct from the ceplialothorax. The small body bears 

 four pairs of exceedingly long legs; the chelicera^ are drawn out 



