434: On a remarkable new Ball-rolling Beetle. 
utrinque obtuse angulato; elytris brevissimis, subtiliter obsolete 
- striatis, hand puncetatis; pedibus anticis validissimis, femoribus 
fortiter incrassatis, antice acute tridentatis, coxis anticis etiam 
acute dentatis, tibiis elongatis, extus post medium dentibus sat 
brevibus 4 armatis, intus serratis, apice leviter incurvato, pedibus 
intermediis mirabile reductis, tibiis brevibus, apice calcare 
spatulato munito, tarsis ad horum extremitates vix attingentibus, 
pedibus posticis modice elongatis, tibiis gracilibus, leviter arcuatis, 
apice calcaribus spatulatis quam tarsis dimidio brevioribus pre- 
 ditis, extus hirtis nigris dense ordinatis bis cristatis, crista 
interior integra, exteriori interrupta ; unguibus minutis, haud 
curvatis aut divergentibus. 
Long. 48 mm.; lat. max. 32 mm. 
This-has no close relationship with any other known 
species. Not only is it much larger, but the conformation of 
the legs is very different. Their hairy fringes are much 
Mnematium cancer, sp. n., naturalsize, 
shorter and more compact, and the swollen and_ strongly 
toothed front femora and the greatly reduced middle pair of 
legs have no counterpart in any other species. The shape 
of the head is as in the species of Sebasteos, very broad and 
sparsely studded with tubercles. The pronotum is distinctly 
broader than the elytra and bears only a few small clusters of 
minute punctures. There is a short upturned fringe of hairs 
near the middle of the serrated lateral margins, which meet 
