CLASS III. AP.ACIINOIDA. 119 



Fam. II. ScoRPioNiDx. Leach. 



Palpi arm-shaped. Mandibles didactyle. Legs alike. 



The animals composing this Family constitute a most natural 

 groupe. 



Sxinps 1. — Tail none. Eyes two, or four. Pcctcn none. 



" The ocelli of the animals of this division are placed on the sides 

 of the anterior sesiment of the body or thorax. They want the tail 

 and the pectinated processes near the base of the abdomen, by wlucli 

 they may very easily be distinguished from those of the second Stiips, 

 with which they were formerly arranged by Fabricius under the title 

 Scorpio. Two species only were known to Linne, who referred them 

 to his artificial genus Pliulangium. The greater number of the spe- 

 cies live beneath the bark of decaying trees or imder stones; but one 

 at least is parasitical, and attaches itself to the legs of flies." Leach's 

 Zool. Misc. vol. iii. Those genera of the second Stirps include the 

 Scorpion, &c. 



Genus 2. OBISIU:\I. Illiger, Leach. 

 jBof/y cylindric : ^//t);-«.i' composed of one segment: mandibles porrect 



. eyes four. 

 Sp. 1. Obi. trombidioides. Second joint of the arms elongate: fingers 



long and straight. 

 Inhabits France and England, under stones. 



A valuable INIonograph has been pidjlished on the British species 

 of this and tlie followins; "enus in the third volume of the Zoological 

 Miscellany, and is illustrated with very accurate figures ot the whole. 



Genus 3. CHELIFER. Geoff., Leach. 

 Thorax composed of three parts: mandibles short: eyes two. 



Sp. 1. Ch.fusciatus. Hands oval; segments of the abdomen bordered 



with whitish. 

 Chelifer fasciatus. Leach, Trans. Linn. Sac. ix. 

 Inhabits beneath the bark of willow and other trees. 



Obs. — Of the second stirps there are no British genera. 



Order II. DIMEROSOMATA. Leach. 



Fam. I. Phalaxgid.e. Leach. 



Eyes two : anus simple. 



Genus 4. PHALANGIUM of authors. 

 Eyes placed in a conmion peduncle : mandibles corneous, sulicylindric, 

 compressed, biarticulate, inflexed or geniculated at the second joint, 



