INSECTS OF MICRONESIA Coleoptera: Platypodidaeand Scolytidae'

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58 Ins ects of Micronesia-- Vol. 18, No .1 , 1960 46. Xyleborus senachalensis Beeson (fig. 11, a). Xyleborus senachalensis Beeson, 1930, Indian Forest Rec. 14 :212. Female: Length 2.9-3.1 mm., 2.6 times as long as wide; color very dark brown . Frons weakly convex, surface reticulate and sparsely punctured; vestiture inconspicuous. Eye less than half divided by an emargination, rather finely granulate. Pronotum equal in length and width, appearing subquadrate; sides and anterior margin rather weakly arcuate; anterior margin unarmed; summit at center; anterior area rather finely asperate, asperities extending to basal one-third at sides; posterior area reticulate, sparse punctures minute; vestiture inconspicuous . Elytra 1.5 times as long as wide, 1.6 times as long as pronotum; sides straight and subparallel on basal two-thirds, rather broadly rounded behind; striae not impressed, punc- a c d FIGURE11.-Xyleborus spp., posterolateral view, female declivity: a, senachalensis; b, destruens; c, exiguus ; d, agnatus. tures rather small, shallow, close; interstriae about twice as wide as striae , punctures fine, minutely granulate, about half as numerous as those of striae. Declivity (fig. 11, a) rather steep, convex but somewhat flattened on lower half; lateral margin from interspace 7 to elytral apex rather strongly elevated, but not sharply carinate; sutural interspace feebly elevated toward apex, not noticeably constricted apically by curvature of sutural striae; interstrial granules somewhat larger than on disc. Vestiture consisting of rows of minute strial hair, and rows of erect , rather long, interstrial hair , somewhat longer and coarser on declivity. Male: Not represented in material at hand. DISTRIBUTION: India and Caroline Is. PONAPE. Seven, Mt. Kupwuriso , 570 m., June-Sept. 1950, Adams; one,
W ood-Platyjodida e and Scolytidae 59 Mt. Nahnalaud, 300 m., Mar. 1948, Dybas; one, Mt. Dolen Nankep, 530-600 m., Aug. 1946, Townes. This species is distingu ished from other Micronesian representatives of the genus by the unarmed anterior margin of the pronotum, by the pron otum being equal in length and width, by the flattened declivity with all interspaces finely tubercula te, by the curvature of the sutural striae on the declivity, and by th e punctation of the pronotum. Th e identity of this species is uncert ain. It was determined by comparing these specimens with two other species that were included in Beeson's key ( 1930, Indian Forest Rec. 14: 234) to the Indian species of this group. The Micronesian specimens appear to be almost identical to Xyl eborus andamanensis Blandford , except that the declivital vestiture is much longer and more slender . 47. Xyleborus destruens Blandford (fig. 11, b) . Xyleborus destr uens Blandford , 1896, Ent , Soc. London, Tr ans. 1896: 221. -Roepke, 1919, Treubia 1 : 15.-Bee son, 1929, Inse cts of Samoa 4 (4): 240. Female: Length 4.5-5.0 mm., 2.7 times as long as wide; color very dark brown. Frons weakly convex, surface reticulat e and spar sely punctured ; vestiture inconspicuous. Eye half divided by an emargination ; rath er finely granulate. Pronotum equal in length and width, appearing subquadrat e ; sides and anterior margin rath er weakly arcuate ; anterior margin unarm ed ; summit at center ; anterior area rath er finely asperate, asperities extending to basal third at sides; posterior area reticulate , spar se punctures minute; vestiture inconspicuous. Elytr a 1.7 times as long as wide, 1.6 times as long as pronotum; sides straight and subparallel on basal two-thirds, rather broadly rounded behind ; striae feebly impressed, puncture s rather small, shallow, close ; interst riae about twice as wide as striae, puncture s fine, about half as numerous as those of striae, and about half of them finely granulate, appearin g irr egular . Declivity (fig . 11, b) rath er steep, flattened on lower half ; lateral margin from inter space 7 to apex rather strongly elevated and irr egularly carinate ; strial punctur es about twice as lar ge as on disc ; apically striae I to 3 curve str ongly toward sutu re ; inter space 1 much narr ower toward apex. Ve stiture consisting of rows of minute strial hair , each hair shorter than diameter of puncture s; and rows of rath er long, erect, interstrial hair ; appearing somewhat shorter on declivity. Mal e: Not repre sented in material at hand. DISTRI BUTION : Andaman, Sumatra, Ja va, Papua, Samoan, and Caroline Is. PALA U. KOROR : Limestone ridge south of inlet, beating vegetat ion, Jan . 1948, Dybas. Thi s species is more closely allied to Xyl eborus senachalensis than to other Micronesian representati ves of the genus, but is readily distingui shed by the larger size, by the distinctly more closely punctur ed pr onotum , and by the curvature of the sutural striae which conspicuou sly reduces the apical width of the sutural interspace .
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INSECTS OF MICRONESIA Coleoptera: Platypodidaeand Scolytidae'

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