Mr. R. V. Chamberlin on new 
er) 
bo 
Spheropaus magnus, sp. n. 
The general colour above is light chocolate-brown, with 
the anterior, normally covered, portion of each tergite black, 
the second tergite, which is wholly free, showing a dense 
black colour over the anterior two-thirds of its length. 
Collum also blackish. Coxe of legs brown, the other joints 
green. 
Head above smooth and shining, not punctate; below 
punctate, puncta not deep ; a shallow depression on each side 
below. Median emargination of labral border wide ; the 
tooth broad, extending to lower end of emargination, black. 
Last article of antenne strongly clavately thickened, distally 
truncate, with numerous sensory cones. 
Collum with anterior margin gently bowed forward 
convexly at middle, concave on each side. Lateral angle on 
each side rather narrow, curving forwards. Caudal margin 
between angles convex, the median portion of the curve 
flattened ; surface smooth and shining, not at all punctate, 
obscurely coriariously marked. Plate margined in front, the 
border set off by a fine sulcus, narrow laterally, thicker at 
the middle. 
The second tergite of usual general form and proportionate 
size; anteriorly broadly excavated to receive the collum ; 
margined in front of the lateral wings and again narrowing 
below ; the plate rounding evenly down to the margining 
sulcus, showing no distinct furrow in the median region, but 
with a moderately wide and deep one evident on the wings ; 
surface smooth and shining, not at all punctate, under the 
lens showing coriarious markings. ‘The surface of the 
following plates similarly smooth and shining, not at all 
granular anteriorly. 
Anal scutum broadly depressed some distance above the 
lower margin, so that the lower border all the way around 
flares out moderately. Above the lower margin a distinct 
fine sulcus. Surface smooth and shining, coriarious lines as 
on the other plates. ‘Tarsus with a single stout spine above 
the claw. 
Anterior gonopods of the male with the immovable finger 
triangular, flattened, the pointed tip strongly chitinous and 
bent toward the other finger. Movable finger much exceed- 
ing the other, biarticulate, the distal joint shorter and 
narrower, the proximal) joint at the distal end on ectocaudal 
side with a short rounded spur or eminence. ‘The posterior 
gonopods distally much resembling the claw of a lobster, the 
