366 THE ARACHNOIDAE. § 295. 



ORDER III. 



Abdomen and cephalothorax unarticulated, distinct from each other. 

 Respiratory organs consisting of tracheae and lungs. 



SUB-ORDER VII. ARANEAE. 



Genera : Mygale, Thomisus, Uptiotes, Lycosa, Dolomedes, Salticus, Seges- 

 tria, Dysdera, Scytodes, Cluhiona, Drassus, Argyroneta, Clotho, 

 Agele7ia, Lachesis, Tegeiiaria, Micryphanles, Theridion, Liiiyphia, 

 Epeira, Tetragnathus. 



ORDER IV. 



Abdomen articulated. Cephalothorax unarticulated. Respiratory or- 

 gans consisting only of lungs. 



SUB-ORDER VIII. PHRYNIDAE. 

 Abdomen distinct from the cephalothorax. Cheliceres unguiculate. 

 Genera : TJielyphonus, Phrynus. 



SUB-ORDER IX. SCORPIONIDAE. 



Abdomen indistinctly separated from the cephalothorax. Cheliceres 

 forficulate. 



Genera: Scorpio, Biithus, Androctonus. 



BIBLIOaR APH Y. 



Leeuwenhoek. Continuatio arcanorum naturae, 1719, Epist. 138, p. 

 312. 



Roesel. Insekten-Belustigungen, Thl. IV. 1761, p. 241. 



Degeer. Abhandlungen zur Geschichte der Insekten, VII. 1783. 



Hermann. Memoire apterologique, 1804. 



/. F. Meckel. Beitrage zur vergleichenden Anatomie, I. Hft. 2, 1809, 

 p. 105. 



Treviranus. Ueber den inneren Bau der Arachniden, 1812. Ver- 

 raischte Schrift. anat. u. physiol. Inhalts. I. 1816. Ueber d. Bau d. Nigua 

 (Acarus americanus), in his Zeitsch. f. Physiol. IV. 1881, p. 185. 



Serves. Memoires du Mus. d'hist. Nat. V. 1819, p. 86. 



Lton Dufour. Ann. gener. d. Sc. physiq. d. Bruxelles, IV.-VI. 



/. Midler. Beitrage zur Anatomie des Scoi'pions, in Meckel's Arch. f. 

 Anat. 1828, p. 29. 



Lyonet. Anat. de differentes espec. d'Insectes, in the Mem. du Mus. 

 d'hist. Nat. XVIII. 1829, p. 282, 377. 



Brandt. Medizin. Zool. 11. 1833, p. 87. Recherch. sur I'anat. d. Araig- 

 nees, in the Ann. d. Se. Nat. XIII. 1840, p. 180. 



Savigny. Descript. de I'Egypte. Hist. Nat. Arachnides, PI. I.-IX. 



Audouin. Lettre contenant des recherches sur quelques Araigneea 



