170 ~Buackpurn AND SHArP—On some New Species and Genera of Coleoptera. 
This insect is allied to P. simplex, from which it differs in shape, the elytra 
being more elongate, much more narrowed towards the base than in P. simplex, 
and haying the humeral angles more strongly produced, and the thorax being 
more regularly rounded laterally. It differs, moreover, from the insect on which 
the original description of P. simplex was founded in having unicolorous antenne 
and tarsi, although in this respect it agrees with certain forms occurring on Oahu 
(which must at present be assigned with doubt to P. simplex as vars.). As in P. 
simplex, the basal joint of the antennz is smaller in the male than in the female. 
This species occurs im mountain forests on Kauai. 
dbp 18 
Proterhinus similis, n. sp.—Sat elongatus; rufescens, plus minusve aureo- 
tinctus, elytris plus minusve nigro-maculatis ; antennis sat crassis, piceis, 
concoloribus; prothorace leviter transverso, lateribus fortiter regulariterque ro- 
tundatis, antice posticeque fortius angustato nec constricto; elytris setis erectis 
sparsius vestitis; humeris parum prominulis. Long. 23-3} m.m. 
This is another ally of P. simplex, Sh. Its most conspicuous distinctive cha- 
racters are that the lobes of the fourth joints of the tarsi are much smaller than in 
P. simplex, that the antennz are of more uniform thickness (the intermediate joints 
being stouter in proportion to the basal and apical ones), and that there is no 
noticeable difference between the sexes in respect of the size of the first joint of 
the antenne. The greater length of the second joint of the antennz, together 
with the feeble development of the tarsal lobes, distinguishes the insect from P. 
tarsalis. 
This species was obtained by beating branches of trees, at an elevation of about 4000 feet, on 
Mauna Loa, Hawaii, where it is not rare. 
AG IB 
Proterhinus laticollis, n. sp.—Sat brevis; rufescens, marginibus lateralibus 
plus minusve nigricantibus ; obscure aureo-pilosus; setis erectis sparsim nec con- 
spicue vestitus; obscure punctatus; prothorace fortiter transverso, elytris nullo 
modo angustiore, lateribus fortiter rotundatis; humeris parum distinctis. Long. 
21 m.m. 
The extremely transverse thorax, which is wider instead of narrower than the 
elytra, renders this species (which belongs to the P. simplex group) very distinct. 
The colour of its whole surface, including legs and antenne, is almost uniform, the 
only marking being some infuscation along the external margins of the elytra; 
the basal joint of the antennz is scarcely longer than the second; the eyes are 
small and little prominent. 
A single male specimen was obtained by beating branches of trees on the Waianae Mountains, Oahu. 
Bs 
