584 CLASS ix. 



anatomy of Phalangium Opilio has been described by G. R. TREVIRANDS 

 Verm. Schr. I. 1816, s. 20 40, and A. TULK Ann. and Mayaz. of not 

 Hist. Vol. xii. 1843, PP- 153165, PP. 243253, pp. 318331, PL 35. 



Note. Several genera have been proposed by KOCH for the arrangement 

 of the numerous species of Phalangium ; see Uebersicht, 2tes Heft, s. 23 

 38. Phalangodes TELLKAMPF is distinguished by the defect of ocelli. 



ORDER V. Pseudoscorpiones. 



Cephalothorax conjoined with abdomen. Abdomen annulate. 

 Palps large, terminated by a hand didactylous (chela). 



Family XI. Pseudoscorpiones. (Characters of the order those 

 of the single family). Palps longer than feet, thicker. Feet mode- 

 rate, terminated by two claws. Habitus of little scorpions without 

 tails. 



Chelifer GEOFFR., LATR. (OUsium ILLIG.), species of Phalan- 

 gium L. The single genus. (Mandibles didactylous. Ocelli two 

 or four, distant, lateral). 



Chelifer LEACH. Cephalothorax parted in two by a transverse 

 furrow. Ocellus single on each side. 



Sp. Chelifer cancro'ides, Phalangium cancro'ides L., KCESEL Ins. in. Tab. 64; 

 the book -scorpion; brown red; the shear-shaped palps are twice as long as 

 the body ; the body without the palp is scarcely i'" long. This little animal 

 lives in dark and moist places in houses, between books, &c., and feeds on 

 mites and wood-lice. 



OUsium LEACH. Cephalothorax undivided. Ocelli on each side 

 two. 



Comp. LEACH Transact, of the Linn. Soc. xi. p. 391 ; LEACH On the 

 Characters of Scorpionidea, with descriptions of the British Species of Chelifer 

 and Obisium, Zool. Miscell. in. 1817, PI. 48 53; DE THEIS Lettre a M. 

 AUDOUIN sur quelques Arachnides, Ann. des Sc. not. xxvn. 1832, pp. 61 

 78, PI. i 3 ; KOCH Arachnid, x. Bd. 3, 4 Heft (new genera Chthonius 

 and Pelorus). 



ORDER VI. Solifugce. 



Cephalothorax distinct from abdomen. Abdomen annulate. 

 Palps filiform, porrect, of the length of feet. 



Family XII. G-aleodea. (Characters of the order those of the 

 single family). 



