ONISCOIDEA. 719 



Length, nearly seven-eighths of an inch. Colour, dark brown, with 

 a few small yellow spots on several of the joints ; segments, laterally 

 a little reddish ; also, margin of abdomen the same. Head about half 

 the width of next segment, and rather less than half as long, some- 

 what narrower in front. Eyes with few facets, situated near middle 

 of lateral margin of head. First thoracic segment very large. None 

 of the segments properly acute at the latero-posterior angles. The 

 last abdominal segment has a faint suture across it, which appears to 

 show the outline of a seventh normal segment. Third and fourth 

 joints of antennae equal, fifth about as long as third and fourth to- 

 gether, flagellum about two-thirds the fifth ; penult shorter than last. 



The caudal appendages have an oblong rectangular form, and the 

 outer basal angle of the base is a little prominent. The other abdo- 

 minal appendages scarcely occupy more than one-third of the width 

 of the abdomen. 



Genus SPHERILLO. 



Armadillini affinis. Appendices caudales ramis duobus instructcB, utro- 

 que laterali, parvulo, breviter styliformi. 



Near Armadillo. Caudal appendages having two branches, both 

 lateral and small and short styliform. 



The two branches of the caudal appendage are both situated on the 

 inner margin of the base, one near the medial line of the abdomen, 

 and the other on the inner side of the base, not far from the apex. 

 The species are intermediate between those of Armadillo and Arma- 

 dillidium. The outer branch is visible, in a dorsal view, between the 

 last abdominal segment and the base of the caudal appendage, and 

 sometimes it is not distinguished at all in a ventral view, when dis- 

 tinct in a dorsal. 



Spherillo monolinus. 



Caput anticd arcuatum. Segmenta thoracis ad latera truncata, supernd 

 lined elevatd rnonilind transversim ornata, primo majore et lineis 



