ONISCOIDEA. 715 



Fam. I. ARMADILLID^B. 



Sfbfam. 1. TYLINiE.* — Appendices caudales infra abdominis seg- 

 mentura posticum celatae et operculiformes. 



G. 1. Tylus, Latr. 



Subfam. 2. ARMADILLINiE.t — Appendices caudales inter abdo- 

 minis segmenta duo postica partim visae. 



G. 1. Armadillo, Latr. partim, Brandt, Edwards.\ — Basis appendicum caudalium 



magnus, ramo interno parvulo, altero obsolete 

 G. 2. Spherillo, Dana. — Basis appendicum caudalium grandis, ramo interno 



parvulo, externo parvulo, laterali, in latere basis interiore versus apicem insito. 

 G. 3. Armadillidium, Brandt.§ — Basis appendicum caudalium brevis, ramo 



externo lato, terminali, interno parvulo. 

 G. 4. Diploexochus, Brandt. — Armadilloni appendicibus caudalibus similis. 



Segmenta thoracis processu horizon tali utrinque armata. 



Fam. II. ONISCIDiE. 



Subfam. 1. ONISCINiE.|| — Maxillipedes 3-articulati, articulis duobus 

 ultimis brevibus et parvulis. Antennae externae ad articulationem 

 5tam bene geniculatae. Basis appendicum caudalium perbrevis, 

 duos stylos multum inaequos gerens, stylo interno sub abdomine 

 saepissime partim celato. 



G. 1. Oniscus, Linn. — Antennae externce subcylindricae, ad basin fronte partim 

 tectae. Flagellum 1-3-articulatum, articulo precedente vix brevius vel longius. 

 Subgen. 1. Trichoniscus, Brandt. — Antennae externae 6-articulatae. 

 Subgen. 2. Porcellio, Latr. — Antennae externae 7-articulatae. 

 Subgen. 3. Oniscus, Latr. — Antennae externae 8-articulatae. 



* Tylosiens, Edwards. The Greek tuXos, would make Tylus in Latin ; and from the 

 oe nitive comes, according to rule, the derivative, Tylinaz. 



f Armadilliens, Edwards. 



\ Pentkeus, Koch. 



§ Armadillo of Koch, and in part of other authors. 



|| Porcellioniens, Edwards. Porcellionidce, Cat. Brit. Crust., Brit. Mus., 1850. We 

 derive the family name from the name of the old Linnaean genus, believing this more 

 correct and even more significant. 



