462 



A New Bark Beetle From Easter Island 

 (Coleoptera, Cossonini). 



BY 0. H. SWEZEY. 



Sericotrogus bryani n. sp. 



Color black, more or less sliiny ; antennae, legs, and anterior margin 

 of pronotum red-brown. 



Head globular, smooth and sliiny and bearing minute sparse punctures, 

 mostly enclosed in the prothorax. Eyes very convex, prominent, wide 

 apart. Eostrum short, about two-thirds the length of prothorax, stout, 

 slightly curved, sides nearly parallel, a little widened at apex, strongly 

 punctate, the punctures in front of the antennae smaller, those behind 

 antennae larger, the surface almost rugose. Antennae situated just behind 

 the middle, scrobes deep, extending more shallowly to beneath eyes; scape 

 reaching to posterior margin of eye, clavate, nearly straight ; first joint 

 of funicle about equal in length to second and third together and about 

 twice as wide as second, third shorter than second, fourth and fifth sub- 

 equal a little wider than third ; club distinct, oval, clothed with white 

 hairs, a few white hairs also on the funicle. Prothorax about one and 

 one-fourth times as long as broad, slightly constricted a little behind the 

 apical margin (the constriction more in evidence ventrally), behind the 

 constriction widening evenly to beyond middle than narrowing roundly to 

 the truncate base; dorsum slightly flattened; punctate with coarse deep 

 punctures, smaller anteriorly, the apical margin impunctate, the sides 

 longitudinally rugose; clothed dorsally with sparse golden decumbent hairs, 

 arising from the punctures, absent in middle of disk (probably abraded) 

 where interspaces are wider, smooth and shining. Elytra about twice as 

 long as wide, wider at base than base of prothorax, truncate with slight 

 humeral prominences, sides nearly parallel, slightly narrowing from base 

 to two-thirds, then more rapidly to the rounded apices ; striae moderately 

 deep, interspaces wide, flat, more or less uneven, and their sides somewhat 

 crenate; clothed with golden decumbent hairs in rows rising alternately 

 from the striae and from small punctures in the interspaces. Under sur- 

 face strongly and evenly punctate, smooth and shining between the punc- 

 tures; raetasternum with a median longitudinal line; ventral abdominal 

 segments 1 and 2 joined, deep transverse grooves between segments 2-5. 

 Legs moderate; all coxae wide apart, hind pair widest; femora clavate, 

 unarmed; tibiae about two-thirds the length of femora, front tibiae 

 shorter, all tibiae uncinate at apex; tarsi shorter than tibiae, third joint 

 moderately bilobed. Length, including rostrum, 3 mm. ; breadth, 1 mm. 



Habitat. — Rapanui or Easter Island, January 20, 1920 [W. 

 A. Bryan). 



Proc. Haw. Ent. Soc, IV, No. 3, September, 1921. 



