CLASS III. ARACIINOIDA. 119 



Fam. II. Scoui'ioNiD.t. Leach. 



Palpi arm-shaped. Mandibles didactylc. lA^gs alike. 



The animals composing this Family constitute a most natural 

 groupe. 



Stirps 1. — Tail none. Ej/es two, or four. Pccttn none. 



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

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

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

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

 with which they were formerly arranged by Fabricius under tlic title 

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

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

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

 at least is parasitical, and attaches itself to the legs of flies." Leuclia 

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

 Scorpion, &.c. 



Genus 2. OBISIUM. Illiger, Leach. 

 jBof(j/ cylindric: <//o;'tfjr composed of one segment: mandibles porrcct 



eijes four. 

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



long and straight. 

 Inhabits France and England, under stones. 



, A \'akiable Monograph has been published on the British species 

 of this and the following genus in the third volume of the Zoological 

 Miscellani/, and is illustrated with very accurate figures of the whole. 



Genus 3. CHELIFER. Geoff., Leach. 

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



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



with whitish. 

 Chelifer fasciatus. Leach, Trans. Linn. Soc. 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^. Leach. 



Eyes two : anus simple. 



Genus 4. PHALANGIUM of authors. 

 Eyes placed in a common peduncle : mandibles corneous, subcylindric, 

 compressed, biarticulate, iiifie.xed or genicidated at the second joiafc 



