464 PERCY SLADEN TRUST EXPEDITION 
TRAPEZIRRHYNCHUS, n. gen. 
Rostrum short, stout, widening outwards in both sexes, in g trapezoidal, as broad as 
long, and rounded at the apex, in § more convex above, longer, and narrower, the antenne 
inserted behind the middle, the scrobes transverse, shallow ; eyes small, lateral, somewhat 
distant from the basal constriction of the head; head exserted, broad in 2, narrow in ?; 
antennze rather slender, the funiculus five-jointed, joints 2—5 small, 3—5 transverse, the 
club small, ovate, narrow, the scape sinuate and about reaching the posterior margin of the 
eyes; prothorax oval; scutellum minute; elytra moderately long, punctate-striate ; coxee 
small, widely separated ; metasternum lone; ventral segments 1 and 2 connate, 3 and 
4 short, the sutures straight ; legs short ;\ tibiae somewhat feebly unguiculate at the outer 
apical angle ; tarsi short, joints 1—3 small, subequal in length, 3 a little wider than 2, the 
claw-joint about as long as the others united, the claws small; body narrow, subfusiform, 
shining, glabrous, winged: species minute. 
Type, ZT. silhouettensis. 
The single species referred to this Pentarthrid-genus is nearly related to Proconus, 
Broun (type, Pentarthrum asperirostre, Broun), from New Zealand, differmg from it in 
having the head and rostrum dissimilarly formed in the two sexes, the antennal club much 
smaller, the basal joints of the tarsi less widened, and the coxze not so widely separated. 
The male of the New Zealand Pentarthrum helmsianum, Sharp (perhaps the finest known 
Pentarthrid), has a somewhat similarly shaped rostrum. 
87. Trapezirrhynchus sithouettensis, n. sp. (Pl. 24, fig. 44, g.) 
Somewhat depressed, piceous or nigro-piceous, the rostrum, antennee, and legs 
ferruginous or obscure ferruginous, shining, glabrous. Head and rostrum closely, minutely 
punctate, together about as long as the prothorax; rostrum (¢) as broad as the head with 
the eyes, transversely depressed at the base, (?) much narrower, transversely convex, 
about twice as long as its width at the base, and more shining; eyes slightly prominent. 
Prothorax about as long as broad, oval, narrowing forwards and moderately constricted 
before the apex ; closely, finely punctate. Hlytra moderately long, not or very little wider 
than the prothorax, subparallel in their basal half; closely punctate-striate, the interstices 
very narrow and somewhat convex. Beneath closely punctate; metasternum obsoletely 
eanaliculate; ventral segments 1 and 2 excavate down the middle in ¢. 
Length 14—1% mm. (22). 
Loc. Seychelles: Silhouette. 
Three males and two females found at the Mare aux Cochons or in the forest above, 
the males varying a little in the development of the head and prothorax. 
STENOTRUPIS. 
Stenotrupis Wollaston, Trans. Ent. Soc. Lond., 1873, pp. 447, 515; Champion, Biol. 
Centr.-Am., Coleopt., iv. 7, p. 13 (1909). 
Dioédimorpha Broun, New Zealand Journ. Sci., i. p. 489 (1883). 
Stenotrupis would appear to have its head-quarters in the Seychelles, whence 15 species 
