‘NOTES ON BRITISH THYSANOPTERA. 223 
the tip of the fore femora, which are a little lighter. Fore tibie 
light brown, mid and hind tibiw a little darker, except near the tip, 
which is similar in colour. All tarsi pale brown. Wings dark 
brown at the extreme base, then a colourless area for about one-sixth 
of the wing length, and from the end of this to the apex pale brown. 
Antennz brown, except for the first two segments, which are very 
pale, and the third, which is paler at the base, becoming darker to 
the apex. 
Surface figuring of chitin.—Transverse striations on the frons, 
round the ocelli and on the back of the head. A thick, heavily 
chitinised band from near the posterior lateral margin of the head 
coming forward on the dorsal surface to the level of the hind margin 
of the eyes; this thickening is on the internal surface of the chitin. 
The chitinised surface of the head behind it is thinner and more 
transparent. The prothorax is covered with a number of transverse 
dark striations; a mid-dorsal longitudinal line would cut approxi- 
mately 36-41 of these stria. There are six smaller and two larger 
irregular depressed areas more free from striations. Meso- and meta- 
notum striated. On the abdominal tergites 1-8, and on the legs all 
the striations are lined with minute sete, which give the charac- 
teristic silky gloss to the species of this genus during life. The 
mid-dorsal posterior part of the abdominal tergites are free from stria- 
tions and sete, particularly on segments 1-4. This may possibly be 
correlated with the presence of wings. On the third abdominal 
tergite there are about 16-17 lines of striation. Hach abdominal 
tergite has a stout transverse internal thickening near the anterior 
margin, which probably serves for the attachment of muscles. 
Head one and a half times as broad as long, broadest across the 
eyes. Frons depressed in front of the anterior ocellus. Hyes large, 
projecting slightly on the front margin; distance between the eyes 
one and a half times the width of the eyes, distance from the eye to 
the back of the head only a little more than half the length of the 
eye. Ocelli small, the anterior one directed forward; the two pos- 
terior distant from the margin of the eye; no noticeable coloration 
beneath. Two stout spines on each side of the frons in front of the 
ocelli, one near the mid line, the other near the margin of the eye; a 
stout spine just on each side of the anterior ocellus; one long and 
two short spines near the posterior dorsal angle of the eye and three 
forwardly directed spines on the cheeks. Mowth-cone reaching about 
three-quarters across the prosternum. Mazillary palps three-seg- 
mented, relative length of segments 7:5:6. Antenne (Fig. 1a) 
almost three times as long as the head, relatively longer and more 
slender than the other European species of the genus. The first 
segment short and barrel-shaped ; the second longer but not so broad, 
tapering at each end but more so at the base; the third long and 
slender, three and two-third times as long as broad with a short 
pedicel at the base, widest at the apical third then abruptly narrowed 
to an apical neck ; the fourth shorter than the third, three times as 
long as broad, and with an apical neck as on the third; the fifth two 
and a half times as long as broad, widest in the middle; the sixth 
about as long as the fourth: the eighth a little longer than the 
seventh. Forked trichomes dorsally on the third and ventrally on the 
