The Philippine journal of science. [Vol. 57, no. 1]

57. 3

Priesner: Oriental Thysanoptera

359

BOLACOTHRIPS ORIENTALIS sp. nov.
Male.-Light yellow, eyes dark purple, testicles orange; legs
pale yellow, joints 1 to 4 of the antenna pale yellow, joint 5
grayish, paler towards base, 6 and 7 dark. Bristles almost co.
lorless.
Head, length, 124 V.; from eyes, 108; width across eyes, 112 to
120; eyes, length about 56; fore angles of eyes somewhat distant
from base of antennae; ocelli not noticeable, apparently absent;
interocular bristles well developed, about 28 to 32 V. in length; a
small anteocular near fore angles of eyes; a very small posterior
interocellar bristle, hardly longer than the inner postocular
bristle; there are only two pairs of postoculars discernible, the
inner of which is very minute, the outer, however, very well
developed, about 32 to 36 p; mouth cone as usual; length of
antennae, 225 V.; measurements of joints: 18 to 20 (25), 34 (22),
36 (17), 31 to 32 (15), 34 to 35 (14), 45 to 46 (15), 15 to 17
(8) p.; joint 1 convex laterally, the sense cones on segments 3
and 4 apparently simple, joint 5 broad at apex, 6 little rounded
laterally. Prothorax narrow, 112 to 120 p. in length, 132 p. in
width; bristles tender, bristles 2 of fore margin 24 to 28 p.,
posteroangulars 56 to 60 and 40 to 44 p.; three pairs of posteromarginals, the innermost 15 to 20 p.. Pterothorax width, 148.;
wings reduced to small scales, bearing five costal (marginal) bristles; segment 9 of the abdomen with very long bristles: there is one dorsal pair of about 116 to 120 p., while a posterior median pair measures not more than 36 to 40 p.; bristle
2 (lateral) is even 136 p.. No comb on tergite 8. Sternites 3
to 7 with large and broad glandular areas (width, 72 to 76 p.; on
segment 7, 68 p.), the fore margins of which are nearly straight,
the hind margins somewhat emarginated. There are accessory
bristles behind the glandular areas, being most numerous (6
or 7) on segment 6, least (2) on segment 5.
FORMOSA, Taihoku, August 4, 1934, 1 male, on onion (R. Takahashi).
This species is very similar to B. jordani Uzel, but differs in
the shape of the antennae and their coloration, the broader glandular areas, and the chaetotaxy of tergite 9, of which the innermost pair of bristles is much smaller than the outwardly following one, while in jordani the first (innermost) pair is longest
(120: 32 p.). The female is unknown.
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