464. ONISCID#. 
ISOPODA. ONISCID. 
NORMALIA. 

PLATYARTHRUS HOFFMANNSEGGII. 
Specific character. Opaque-white. Upper surface of the animal scabrous, 
with compressed scale-like club-shaped prominences. Posterior margins of 
the segments sub-serrated. 
Length, one to one and three-quarters of a line. 
Platyarthrus Hoffmannseggit. Branvt, Bull. Soc. Nat. Moscow, vi. p. 174, 
pl. 4, fig. 10 (antenna, absq. descr. specifica). 
Hogan, in Nat. Hist. Rev. vi. p. 109. 
KinaHwAN, in ditto, p. 127. 
Ttew crassicornis (2). Koon, in Contin. Panzer Ins. Deutsch]. 186, 
fol. 5 ; and Deutschl. Crust. Xe. 36, 5. 
Tuts curious little species has much the aspect of a 
Porcellio ; it is, however, considerably broader in propor- 
tion to its size, the smallness of which, moreover, together 
with its opaque-white colour, broad short antennz, sub- 
terrestrial and ant-loving habits, well distinguish it. 
The head is broader anteriorly than posteriorly, deeply 
