INSECTS OF MICRONESIA Coleoptera: Platypodidaeand Scolytidae'

44
Insects of Micron esia- Vol. 18, No .1 , 1960
presence of rows of erect scalelike setae on the declivity and usually by more
numerous interstrial hairs.
Specimens previously referred to under the name Hypoth enemus insularis
represent the same species encountered in Florida. All of the variations found
in Micronesian and Hawaiian specimens were also observed in the North
American material. Because complete intergradation between variations was
found in individual long series from both areas, the only conclusion that can
be drawn is that only one species is represented. The specimens of slightly
smaller than average size, with the most common variation of frontal sculpture
and of elytral vestiture, are identical in all respects with a single specimen from
West wood's type series in the U . S. National Museum.
The species described by Schedl under the name H. insularis ( 1934, Stylops
3 : 178) is another species.
33. Hypothenemus mangarevanus Beeson.
H ypothenemus mangarevanus Beeson, 1940, B. P. Bishop Mus., Occ. Papers
15 (18) : 196.
Female: Length 1.0-1.1 mm., 2.5 times as long as wide ; color dark brown.
Fron s evenly convex, slight impression above epistoma ; surface reticulate , rather
deeply punctured ; vestiture inconspicuous.
Pronotum about equal in length and width; widest on basal third, sides weakly
arcuate , rather broadly rounded in front ; anterior margin armed by six serrations, lateral
ones smaller ; posterior area s subreticulate, finely, shallowly punctured laterally, becoming
sparsely granulate behind summit; vestiture hairlik e, intermixed on posterior half with
longer , equally abundant, scalelike setae.
Elytra 1.6 times as long as wide, 1.7 times as long as pronotum; striae indistinctly
impressed, punctures rather large, deep ; interstriae as wide as stria e, puncture s fine, rather
close, uniseriate , very finely granulate. Declivity steep, convex; striae and interstriae
narrow er than on disc, interstrial granule s larger, closer. Vestiture consisting of rows of
minut e strial hair , and rows of erect interstrial bri stles ; inter strial bristles scalelike on
disc, becoming narrower posteriorly, almost hairlike on declivity.
M ale: Unknown .
DISTRIBUTION: Mangar eva and S. Mariana Is .
S. MARIANA IS. SAIPAN: 11, As Mahetog area, beating, Jan .-Feb. 1945,
one, hills east of Garapan , Jan. 1945, two, near Garapan , Dec. 1944, five, Ha ­
laihai-As Teo area , J an. 1945, two, Mt. Tagpochau, 375 m., Feb. 1945, 12,
Papago area, Jan . 1945, one, Sadog Talofofo, beating, Feb . 1945, all Dybas.
Th is species may be readily distinguished from other Micronesian representatives
of the genus by the erect, rather broad , interstrial scales on the
elytral disc which become slender and almost hairlike on the declivity.
Genus Carposinus Hopk ins
Carposinus Hopkins , 1915, U. S. Dept . Agric., Rept. 99 : 47 (type: C. pini) .­
Schedl, 1952, Philippine Jour. Sci. 81: 363.
Orosiotes Niisima, 1917, Essa ys Nawa , 1 (type : O. kum atoensis) .