270 A PRELIMINARY ACCOUNT OP THE THYSANOPTERA 
Lucassen at Sambas in May, 1890. The female is smaller, and 
may be recognized by its less swollen fore-legs and the 
smaller fore-tarsal tooth. 
W. Borneo, two males, Sambas, May, 1890 (Lucassen); 
W. Sarawak, two males, Matang, from dead bark, Decem¬ 
ber, 1918, and another in January, 1914; one female, 
Quop, March, 1914 (G. E. Bryant); not yet recorded from 
elsewhere. 
Adiaphorothrips antennatus , Bagnall, 1915. 
Ann. & Mag. Nat. Hist. ser. 8, xv. p. 594. 
A new species separated from A. simplex by the shorter 
head, the stronger cephalic spines, and the shorter inter¬ 
mediate antennal joints, 3 and 4 being subequal. 
W. Sarawak, two males, one from Matang from under 
bark of dead tree, December 7th, 1918, and the other from 
Quop, March 28th, 1914 (G. E. Bryant). 
Genus Dinothrips, Bagn. 
Dinothrips sumatrensis , Bagnall, 1908, 
It seems that there are more than one species of Dino¬ 
thrips. Schmutz describes D. furci/er from Ceylon, but 
does not compare it with sumatrensis , and it is desirable 
that his specimens should be re-examined. Z>. sumatrensis 
is recorded from Sumatra, Java, New Guinea, Central 
Tonkin, Birmania, Penang, Borneo, Singapore, and the 
islands Mentawei, Engano, and Nias, but it is doubtful if 
all these records refer to the true sumatrensis. In Mr. 
Bryant’s collection there are evidently two forms, the pre¬ 
sent species being provisionally characterised by the rela¬ 
tively shorter and stouter third antennal joint and the 
distinctly longer ante-ocellar spines. The third antennal 
joint is of a clear yellow colour, broadly banded with black 
basally and distally. The male is larger than the female. 
The other species, which may be called 
Dinothrips affinis, sp. n., 
has the female larger than the female of sumatrensis , and 
in the few specimens at my disposal distinctly larger than 
the male. The third antennal joint is not only more 
slender, but distinctly longer than in sumatrensis , yellowish- 
to reddish-brown, rarely darker basally, and only narrowly 
blackish-brown at apex. The ante-ocellar spines are stout 
and rather short. 
