262 MEMOIRS ON THE COLEOPTERA 



base of the horn extends a straight strong ridge on each side to the 

 middle of the clypeal sides, the lateral part of the clypeal suture fine 

 but distinct, slightly tumid, extending obliquely backward from the 

 foot of the horn to the inner part of the eye-canthus; upper surface 

 of the horn basally prominently convex, but even and without trace 

 of tubercle; prothorax three-fourths wider than long, widest just 

 behind the middle, where the sides are prominent and broadly, 

 bluntly angulate, thence oblique and barely arcuate to base and to 

 the strong porrect and acutely angulate process projecting somewhat 

 outwardly from each apical angle, the apical margin between the 

 spines feebly arcuate, with the broad flat margin angularly pro- 

 longed posteriorly at the middle; surface finely, closely and irregu- 

 larly punctate, becoming smooth and sparsely punctate on the 

 shining slope before the central process, which is short, curving 

 forward, parallel-sided, evenly bifid but not enlarged at tip, not as 

 long as the head, with its upper surface canaliculate throughout and 

 the concave slope immediately below it with a denser patch of longer 

 hair, extending almost to the apex; scutellum well developed, rather 

 wider than long, ogival, flat, smooth, glabrous and minutely, ob- 

 soletely punctulate, with a few scattered coarse punctures basally, 

 which bear long decumbent hairs; elytra an eighth to fifth longer 

 than wide, parallel, a fifth or more wider than the prothorax and 

 two and one-half times as long, parallel, feebly inflated behind and 

 rounded obtusely in posterior third, finely, not densely punctate 

 and pubescent throughout, and with distinct traces of three oblique 

 double sets of impressed lines; pygidium transverse, vertical, evenly 

 and rather strongly convex, densely pubescent throughout; tarsi 

 all much longer than the tibiae but especially the intermediate as 

 usual. 



Female smaller, narrower and more oval than the male, the pu- 

 bescence sparser and nearly wanting on the pronotum, except a 

 few hairs toward the sides and also almost wanting on the elytra 

 basally and sparse elsewhere, dense on the under surface but wanting 

 on the abdomen medially and on the lower surface of the femora, 

 excepting the usual upper and discal fringes; head rather smaller, 

 finely, densely sculptured, smooth at the base medially; sides of the 

 apically more contracted clypeus much more arcuate and nearly 

 parallel basally, the apical tubercles equally strong but not so distant, 

 the centre of the surface without a process but with a short transverse 

 ridge; prothorax barely three-fifths wider than long, the sides promi- 

 nent submedially, the feebly sinuate apex a little more than half as 

 wide as the base; surface evenly convex and with very coarse deep 

 and rather close-set punctures, becoming irregularly sparse basally; 

 scutellum as in the male; elytra a fifth longer than wide, nearly 

 similar in proportions though rather more inflated behind and with 

 sparse, coarser punctures, becoming very coarse suturally; pygidium 

 smaller, transversely ridged just above the middle, sparsely punctured 

 and pubescent basally, the lower part concave, scabrous and with 

 sparse erect hairs; last three ventral segments increasing very rapidly 

 in length; tarsi all longer than the tibiae. 



