150 DK. C. CHILTON ON THE 



reachiu^ downwai-cls so far as lower margin. The mesosome bears four longitudinal 

 rows of tubercles (/. e., from tubercles on each segment), the two inner rows a little 

 external to the median line, the other two more lateral ; on the anterior segments the 

 tubercles are not very prominent, but on the succeeding segments they become larger 

 and more prominent and project slightly backwards ; on the seventh segment the two 

 medicin tubercles are very large and project backwards over the metasorae, while the 

 lateral tubercles are pooi'ly marked and form only slight elevations at the outer side 

 of the base of the others. The tubercles are covered especially near the apex with 

 numerons stiff setae. Shorter setae are also found on the rest of the surface, and some of 

 them, especially along the posterior margins of the segments, are broad and scale-like. 

 Metasome witli an indistinct median ridge formed by a setose tubercle on each of 

 the last four segments, that on the fifth the largest ; first and second segments short, 

 the first almost concealed by the preceding segment, all the segments of mesosome 

 fitting closely together ; terminal segment much broader than long, sides concave, 

 posterior margin slightly convex. 



Eyes rather small, of about ten ocelli. Antennae short. 



Uropoda with base fitting closely into the space between the side-plates of the fifth 

 segment and the terminal segment ; outer branch very minute, not projecting beyond the 

 inner margin of the base, inner branch reaching about to end of last segment. 



Colour brown. 



Length about 6 mm. 



Habitat. — Keuepuru, Marlborough, in the bush [MacIIahon). 



'Remarks. — I take pleasure in naming this fine species after Mr. Joseph MacMahon, to 

 whom I am indebted for many Terrestrial Isopoda collected at Keuepuru. 



8. Aemauillo spinosus, Dana, 1853. 



Upherillo spinosus, Dana, U. S. Explon Exped., Crust, ii. p. 72.3, pi. 47, tig. G (1853). 

 SpherUlo spinosus, Miers, Cat. N. Z. Crust, p. 97 (1876). 

 Armadillo spinosus, Buddc-Luiid, Isopoda Terrestria, p. (1885). 



Spherillo spinosus, Thomson & Chilton, Traus. N. Z. Inst, xviii. p. 159 (1885, 



The folloAving is Dana's description of this S2)ecics : — 



" Body bristled throughout with subacute spines, margin either side a little produced 

 and segments laterally truncate. Head nearly trapezial, arcuate in front, and a little 

 broader than behind. Eirst segment of thorax largest ; segments of abdomen laterally 

 obtuse, the last subquadrate, not broader at base, truncate at apex. 



" New Zealand, near Bay of Islands (Coll. Dr. C. Pickering; Dana). Under bark 

 of pine-trees." 



Remarks. — I have seen no specimens of this species, but it appears to come near 

 A. MacMuhoni, differing, however, in having the spines much more nvimerous and more 

 acute. 



