Three Genera .of Papuan Passalid Coleoptera. 107 
and unpunctured. The upper surface of the head is smooth, polished and 
unpunctured; the outer tubercles are strongly produced and broadly truncate, 
the left much broader than the right; the ridge joining them to the inner 
tubereles is very strongly developed. The inner tubercles are large, and 
somewhat compressed laterally. The anterior angles of the head are 
obtuse, and the outer ends of the canthus rounded. The central tubercle 
is laterally compressed. The parietal ridges are very indistinct; they are 
direeted backwards near their origin from the central tubercle, but bend 
forwards laterally. The prothorax is smooth and polished above, except 
in the scars which contain hair-bearing punctures; the median groove 
is very strongly developed, and praetically complete in front; the 
marginal groove is widely incomplete across the middle before and 
behind. The anterior angles of the lower side of the prothorax are 
punctured along the outer margin only; the posterior angles are closely 
punetured and very hairy throughout. The seutellum bears a distinet median 
groove, with a few large punctures on the disc on either side of it, as well as 
finer ones in the anterior angles. The Mesothoracic episterna are 
coarsely but somewhat sparcely punctured, except in the posterior angles 
which are smooth and polished. The mesosternum is smooth and polished, 
except in the scars which are somewhat coarsely but irregularly and 
indistinetly puncetured. The fused lateral and anterior intermediate areas 
of the metasternum are rugose and very hairy; the posterior inter- 
mediate areas are practically unpunctured. The posterior parts of the 
hind coxae are rugose. The abdominalsterna are smooth and polished. 
The elytra are hairless and unpunctured except in the grooves, all of 
which are somewhat obscurely punetured. 
- Hyperplesthenus impar, Kuwert. 
Redescribed from the type specimen from Mt. Yule, New Guinea, in 
the Stuttgart Kgl. Naturaliensammlung, and from a single 
worn speeimen from German New Guinea in the collection of the Berlin 
Kgl. Zoologisches Museum. 
Length 42mm. The angles of the labrum are somewhat less 
broadly rounded than in the preceeding species, which this species resembles 
in all points not mentioned in the following description. 'The scars of 
the mentum are more or less »-shaped, and strongly curved, and may be 
united behind to form together a »-shaped figure as in the genus Omegarzus, 
KUWERT; the anterior as well as the posterior parts of the areas outside 
these scars, may bear large hair-bearing punctures. T'he outer tubercles 
of the head are much shorter than in H. glaber, and that of the right 
side is almost as broad as that of the left; instead of being simply truncate 
gr 
