19, 5 
Heller: New Philippine Coleoptera 
583 
In judging the sculpture of Mecistocerus, the state of pres- 
ervation of the squamosity must be considered. If it is in 
perfect condition, then the punctures of the elytral striae 
seem to be round, small, and remote; but when it is scraped 
off, they appear to be quadrate or rectangular-oblong, separated 
only by a narrow cross-bridge. 
Key to the Philippine species of the genus Mecistocerus including 
Rhadinomerus. 
a 1 . Rostral canal extending backward at least, to hind border of inter- 
mediate coxae M. marei Boh. 
a 2 . Rostral canal not extending backward as far as hind border of inter- 
mediate COX33. 
b\ Sides of prothorax set with a series of longer diverging bristles. 
M. sollicitus Faust. 
b\ Sides of prothorax without such bristles. 
c\ Prothorax with a distinct smooth central carina. 
d 1 . Posterior femora not strikingly compressed at base; prothorax 
without a pale lateral stripe. 
e\ Elytra with a more or less extended pale humeral spot. 
f. Elytra depressed 61 along suture, shoulders obliquely truncate 
and distinctly broader there than base of thorax; posterior 
femora extending beyond apex of elytra; third and fourth 
sternites blackish scaled except for a subquadrate pale 
lateral spot M. ingemrus Faust. 
f. Elytra not depressed along suture, moderately broader at 
shoulders than base of thorax. 
g 1 . The coarse punctures of first and second sternites bearing 
a fine seta, those on femora a strong bristle; posterior 
femora pale with a dark median band. 
M. nigrostriatus Chevr. 
g'\ The coarse punctures of first and second sternites, like 
those of femora, set with similar setiform scales, pos- 
terior femora chiefly blackish scaled with a subapical 
white spot M. montanus sp. nov. 
e\ Elytra without a pale humeral spot. 
h 1 . Striae of elytra narrower than the intervals. 
1 1 . Thorax globose, subtransverse, slightly constricted toward 
base, densely and deeply, moderately coarsely punctate; 
intervals of elytra flat. 
M. setosipes sp. nov. (Rhadinomerus). 
1 2 . Thorax not globose, transverse (6.6 : 9), coarsely punctate; 
intervals of elytra subconvex, partly subgranulose. 
M. modestus sp. nov. 
h 2 . Striae of elytra as broad as intervals; thorax somewhat flat- 
tened, very coarsely punctate M. latiusculus sp. nov. 
61 Easy to decide by a view from behind toward the front along the 
suture. 
