47 



Fam. III. PhalaNGIDEA *. Pedum par anticumab brcvi- 

 atum deflexum didactylum : par secundum 

 breve subraptoriuni ungue simplici instructum : 

 paria 4 postica inaequalia ambulatoria, ungui- 

 bus didactylis instructa; paribus 2 et 4 longi- 

 oribus. Ocelli 2. 



Fam. IV. SoLPUGlDEA f. Pedum par anticum breve eras- 

 sum porrectuni didactylum : paria 2 et 3 sub- 

 ambulatoria femoribus contiuentibus labium ac- 

 cessorium efFormantibus ; tarsis exunguibus : 

 paria 4, 5 et 6 ambulatoria; tarsis ungue didac- 

 tylo instructis. Ocelli 4. 



* * Abdome7i articuUs obsoletis aut nullis, 



Fam. V. Ar ANIDEA '\.. Pedum par anticum breve crassum 

 saepius deflexum monodactylum : par secundum 

 breve subambulatorium; tarsis exunguibus : pa- 

 ria 3, 4 et 5 conformia (longitudine inasqualia) 

 ambulatoria ; tarsis ungue didactylo insti'uctis. 

 Ocelli 6 aut 8. Anus papillis textoriis. 

 Obs. All the Aruchnides Tracheennes of Latreille, except- 

 ing the Genera Pijcnogonum, Pho.vichilus, AmmotJiea 

 and Ni/mplniui (whose situation is doubtful), and the 

 Genera Plialangium, Solpuga and Trogulus (and per- 

 haps Sird), constitute a peculiar Class, which I have pro- 

 posed to name Acari. 



* 1. Phalangium, Latr. 2. Trogulus, Latr. 



-j- Galeodes, La/r. Solpuga, Fa/r. Rhax, Hermann. 



If. Fam. Araneides, Latr. 



