NOTES ON BRITISH THYSANOPTERA. 945 
equally long, the basal much stouter than the apical, and narrowing 
a little towards the base; labial palps with one distinct slender 
segment and probably a very short basal one. Antenne eight-seg- 
mented; the first segment short, the second broader and longer, 
barrel-shaped, narrower at the base; the third with a short pedicel, 
narrow cylindrical in the basal third, then expanding irregularly, 
widest at the apical third, then again rapidly constricted to a short 
apical neck; the fourth shorter than the third, gradually widening 
from the base to the apical third and constricted as in the third but 
with a shorter neck; the fifth shorter and narrower than the fourth, 
and irregularly widening to just before the apex, then slightly con- 
stricted ; the sixth with the sides rounded, as wide as the fifth but 
much shorter, with an irregular dark transverse line just in front of 
the middle; the seventh very short; the eighth very long and slender, 
with a longer slender hair at the extreme tip. Forked trichomes on 
the third and fourth segments very long and slender, those on the 
fourth segment reaching beyond the apex of the fifth. Colour as 
described above. 
Prothorax slightly longer than the head and about half again as 
wide as long, only quite short spines at its angles and about fourteen 
minute ones scattered more or less symmetrically over the pronotum 
Pterothorax stout, rounded. Legs normal, fore femora somewhat 
short. Wings fully developed, setze covering the membrane of the 
fore wing rather long. On the costa 24-27 spines. On the fore vein 
six at the base and two near the apex. On the hind vein 7-9. The 
fringe on the costa starts just external to the white band near the 
base of the wing. The vein on the hind wing distinct almost to 
_the tip of the wing. 
Abdomen normal. Spines on the ninth segment short, reaching 
to just beyond the tip of the tenth segment. Spines on the tenth 
segment a little shorter. Tenth segment split mid-dorsally through- 
out the entire length. 
Described from three females found on orchids (Lelia anceps) 
in a greenhouse at Surbiton, near London—one in August, 1913, 
and two in May, 1914—by Mr. W. J. Kaye. 
Type in the author’s collection. 
This species may be recognised by the form of the banding 
of the wings, which recalls H. aulmanni, Karny, and also by the 
transverse ridge across the hind part of the head, which is found 
also in H. brunneipennis, Bagnall, to which it is most closely 
related. It is distinguished, however, from this by the colour of 
the wings, which, in H. brunneipennis, are uniformly dark brown 
with a small white spot near the base. It is impossible to 
suggest the original home of H. errans, the genus Heliothrips 
being widely distributed throughout tropical and sub-tropical 
countries. ‘The greater number of orchids in the greenhouse 
in which they were found came from Central America (chiefly 
Venezuela), but H. brunneipennis, to which it is most closely 
allied structurally, is only known from Ceylon. 
(To be continued.) 
