_CHAMPION—COLEOPTERA ; CURCULIONIDA 465 
are now known, some of these being closely related to the type, S. crassifrons, Woll., from 
Makian, in the Malayan Archipelago. They are all elongate forms, with the exposed 
anterior portion of the head prolonged or dilated, and the small, depressed or inconspicuous, 
eyes well separated or distant from the basal constriction; and the rostrum more or less 
thickened at the tip, stouter in ¢ than in 2, sometimes much widened in the former, and 
sometimes extremely slender in the latter, sex. In the remarkable series obtained by 
Mr Scott there is a complete gradation from the robust S. crassipes to the minute slender 
S. dumetorum. The males have the first one or two ventral segments more or less grooved 
down the middle, and the fifth sometimes foveate. The genus also includes various forms 
from Tropical America and New Zealand, and is doubtless represented in other regions. 
One of the New Zealand species, S. (Pentarthrum) wollastoniana, Sharp, the type of 
Dioédimorpha, Broun, is closely related to S. parallela; and Pentarthrum debile, Sharp, 
from New Zealand, and P. prolzum, Sharp, from the Hawaiian Islands, also belong here. 
a. Head with the exposed anterior portion oblong, dilated, or subconical, sometimes 
considerably shorter or transverse in ?, and constricted at a greater or less 
distance behind the eyes, the latter small; prothorax elongate. 
aw 
Tibize (or at least the anterior pair) distinctly mucronate at inner apical 
angle, the outer uncus well developed. 
av. Rostrum very long and subcylindrical in both sexes, at most feebly widened 
at tip; body very elongate ; under surface coarsely punctate. 
a. Body fusiform; prothorax more finely punctate; rostrum stout in 4%, 
slender in ¢; anterior portion of head oblong in g, shorter in ? 
lodorceicola. 
b°. Body subeylindrical; prothorax coarsely punctate; rostrum stout in ? 
[¢ unknown]; anterior portion of head transverse (2) ... rufipes. 
b’. Rostrum much shorter; elytra less elongate: species small conveaxiuscula. 
c’. Rostrum widened outwards, stout in 2, slender in @. 
ce. Anterior portion of the head oblong ; body elongate, depressed. 
a. 
Upper surface densely, coarsely punctate ; legs stout ; third tarsal joint 
broad, bilobed ; under surface closely, coarsely punctate: species 
large and robust.. ae se oak we. Crassipes. 
b'. Upper surface more anes punctate ; diel fae joint smaller ; under 
surface sparsely, finely punctate: species more slender parallela. 
d’. Anterior portion of the head transverse ; body subeylindrical ... ilum. 
b'. Tibize not or obsoletely mucronate at inner apical angle, the outer uncus feebly 
developed ; body depressed, narrow ; rostrum more or less thickened at 
tip: species small or very small. 
d*. Rostrum broad and much widened outwards in ¢, slender and more elongate 
in ? ; apex of elytra sparsely pilose ... i d ... biformis. 
e. Rostrum slender in ¢, stouter in ¢, slightly Pilea at hie 
e. Upper surface finely pubescent throughout. 
4 
ce. Third tarsal joint broader, bilobed ; upper surface subopaque  tarsalzs. 
d‘. Third tarsal jomt narrower. 
