Nicholls axd Barnes. — Tiro New Terrestrial Isopods. 155 
It is readily distinguished from both these species by the 
consideialde development of the coxojkxI ites ou tlie first three iiieso- 
soimitic segments, and the form and structure of the ])leopods, 
a- well as by differences in the mandi})les and luaxillipedes. 
Actaecia pallida sp. nov. (Plate XX and Text fig. 2.) 
The hody (PI. XX, fig. 1) is convex, almost exactly twice as 
long as l)road, surface scabrous and covered with short scattered 
si'iiies most ('vident ni)oii the a])peiidages and along the lateral 
margins of the body. 
The cejthalon is lonnded with the frontal margin laised slightly, 
depressed in the middle. 
The eyes are la.rge, round, with numerous ocelli, and occu])V 
the greater portion of tin' lateral region of the cephaloii. 
In the (Uiteiinules (PI. XX, fig. o) three joints are distinguish 
able. The whole api)eiiduge tapers gradually to the a]iex, whicu 
bears two or three moderately long s])ines; laterally a number of 
shorter si)ines are ]>resent. 
The anienrae (PI. XX, fig. '!) are extremely spinous. The 
ilagelluin is almost as long as the terminal joint and four-jointed, 
the terminal one being v(‘ry slender, more than twice as long as 
broad, and bearing apically a number of setae. 
The upper lip has the usual structure. 
The left mandible (PI. XX, fig. Id) has the outer cutting 
edge composed of three strong chitiiious teeth, the inner of four. 
At the base of the inner row is the ciliated lappet which is 
extremely setose. Below this three ])eiiiciUa are present (1 + 2) 
and a very long bushy seta. 
The riyht mandible (PI. XX, fig, PI) has three or four teetn 
in the outer cutting edge, but the inner is reduced, less chitiuous, 
and consists of a number of smail teeth. Ihdow is the ciliated 
lappet as in the left mandible. Only two penicilla are present: 
(1 + 1), and a similar long seta. 
The hrwer lip is formed of two lobes, wliicli have the apex 
and inner margin setose, and a central rounded, setose portion. 
Til the prsl maxillae (PI. XX, fig. 12) the apex of the outer, 
lobe is armed with a number of chitiiious teeth, the inner grouj’ 
of Avhich are bi-miguiculate, the iiiuer lobe bearing apically two 
slender plumose setae, and its imiei' side produced into a small 
spine. 
