TERRESTKIAL ISOPODA OF NEW ZEALAND. 105 



b. Jiody without lougitucliual ridges Trichoniscus. 



'.^. Eyes of moderate size, more than three ocelli. 



a. Pleon with lutcral expaiisious Onlscus. 



b. Pleon with lateral ex])ansions. 



i. Flagelluni much shorter than last joint of |i('(l[inek' Scyphoniscus. 



ii. Flagellum ahout as long as last joint of peduncle Philoscia. 



In tlie following- list 27 species are mentioned, bnt of these tliei-e are 4 which I have 

 not seen, aud which must be considered as more or less uncertain, though one, Armadillo 

 spinosHS, Dana, is in all pro1)ability a good species and distinct from the others given, 

 and I have tliereforc included it in the artificial key to tlic species. I have not been able 

 to do this with the other three species. 



List of Species. 



OXISCOIDEA. 



I. LlGIID^. 



1. Ligia iwrte-zeahuidice, Dana. 



II. Trichoniscid/E. 



2. Trichoniscits phormianus, sp. nov. 



3. „ otakensis, sp. nov. 



4. „ Thomsoni, Chilton. 

 .5. Hnplophtluthims Helmsii, sp. nov. 



III. Tyli».e. 



6. Tylo.s iieozelanicus, sp. nov. 



IV. SCYPHACID^. 



7. Scyphiix urnalus, Dana. 



8. „ (?) aucUandue, G. M. Thomson. 



9. Scyphoniscus waitatensis, nov. gen. et sp. 



10. Actcecia euchrou, Dana. 



11. „ opihensh, sp. nov. 



V. OnISCID/E. 



12. Oiiiscits ijdiictatus, G. M. Thomson. 



13. ,, Leiieptirensis, sp. nov. 

 II. ,, CooL'ii, Filhol {nut accn). 



15. Pliilosciu ptibescens, Dana. 



16. „ novce-zealanditey Filhol (^not seen). 



17. Porcel/io sraher, Latreille. 



18. y MctopoiKjrfhus pru'niosus, Brandt. 



VI. Akmadilliid.k. 



19. ArmadUHdhiiii vulgare, Latreille. 



20. Armadillo amljitiosi/s, Budde-Lund. 



21. 

 22. 

 23. 

 24. 

 .25. 

 26. 

 27. 



Dante, Heller. 

 s-peciosus, Dana. 

 rmpilosus, Miers. 

 niunolinus, Dana {not seen) 

 Handltoni, sp. nov. 

 Marmahoni, sp. nov. 

 sp/nosHs, Dana (not seen). 



Family I. LIGIID^. 



In this family the antennae have the flagellum multiarticulate, i. c. with more than 

 six or seven joints, the mandible has a well-developed molar tubercle with triturjiting 

 surface, the inner lobe of the first maxilla bears three plumose bristles, the terminal 

 portion of the maxillipede is of moderate size and more or less distinctly divided into five 

 joints, and the external male organ is double. 



The family contains scA^eral genera, the best known being Ligia, Liyidiuni, and 

 Titaaethes. The genus Geoligia, Dollfus, appears to be very near to Ligia, but the 

 only known species, G. Simoni, lives far away from the sea, while all the species of Ligia 

 are found on the sea coast. 



