268 Mr. R. 8. Bagnall on Thysanoptera 
where it is about one-half as broad as at base. Terminal 
hairs longer than the tube, very slender and colourless 
distally. Abdominal setz long, slender, and light-coloured, 
those on 7 and 9 not quite as long as the tube. 
In the three available specimens it is impossible to secure 
the correct relative lengths of the antennal joints and also 
of the head and pronotal chet. 
The species is chiefly remarkable for its short head, which 
is no longer than broad. In addition to this salient charac- 
teristic it differs from H/. brevicollis, Bagn. (E. Africa), by its 
less transverse prothorax, the shorter and stouter tube, and 
the stronger chzetotaxy of head and pronotum. 
Loc. Srycnuetites. Mahé: Cascade, marshy ground near 
sea-level, 1 9, 20. ii. 1909, and 2 2 from marshes on coastal 
plain at Anse aux Pins and Anse Royale, 19-20. 1. 1909. 
Also Long Island. 
6. Haplothrips silhouettensis, sp. u. 
(Pi. Va, dig. 31) 
The antenne are absent in each of the eight preparations 
before me, but fragments were present in one or two of the 
specimens before they were transferred from cards to micro- 
scope-slides, and, as I then grouped both this and the 
preceding as one species, I infer that the antennz had the 
intermediate segments yellow. 
? .—Length approximately 1°7 mm. 
Colour dark grey-brown ; fore-tibiz and all tarsi yellowish, 
more or less shaded with grey to brown ; wings clear or with 
at most the faintest suspicion of a grey tinge. 
Head about 1:2 times as long as broad with eyes occupying 
about 0°4 the dorsal length; ocelli large, placed above a 
line drawn across the centre of eyes and the posterior pair 
contiguous to their inner margims ; anterior ocellus directed 
forwards, overhanging ; cheeks practically subparallel. 
Provotum about 0°75 the length of the head ; sete present, 
long, stout and distally dilated as in mahensis (the same 
remarks as I have already made for the preceding species, as 
regards the cephalic and pronotal chzxtotaxy, apply to 
silhouettensis ; the cheetotaxy is more or less destroyed in 
all of the specimens and in none of them are the postocular 
sete: or the terminal hairs of the tube preserved). Fore- 
tarsus with a minute tooth as in mahensis. Fore-wings with 
seven or eight duplicated cilia. 
Abdomen as in mahensis; tube about 0°55 as long as the 
