NOTES ON BRITISH THYSANOPTERA. 225 
bending in of the front margin. On the fore wings there is no trace 
of a hind vein; the fore vein is represented by a row of short spines, 
3 at the base, then a short space on the clear part of the wing, then 
16-20 with a short space just before the last spine. At this level 
there is one spine nearer the hind margin of the wing which may 
represent the last of the row of spines usually present on the hind 
vein ; 22-25 spines on the costa. The costal fringe begins about one- 
quarter the wing length from the base. Colour pale brown with a 
narrow colourless band just before the base. Hind wings pale brown 
with a darker central vein distinct almost to the tip of the wing. 
Abdomen normal. On the hind margin of tergites two to eight 
there is a fairly stout spine inset near each lateral end. Along the 
whole of the hind margin of these tergites there is a fine comb. The 
hind margin of sternites 2-6 is ornamented with alternate lengths 
of fine comb and long slender inset spines; there are six of these 
spines on each sternite. 
Male (macropterous) about one-sixth smaller than the female. 
Antenne similar in colour to those of the female. Wings fully 
developed, 15-17 spines on the outer half of the fore vein ; 20-23 on 
the costa. On the abdominal sternites 3-7 there is a comparatively 
large round clear area surrounded by a dark margin; the diameter 
of this area is about one-third the length of the sternite. This area 
is little if any paler than the surrounding sternite and has a granular 
appearance. 
Type in the author's collection. 
Described from one female swept from mixed herbage on a 
railway bank at Yarnton, near Oxford, England, by C. B. 
Williams, on July 18th, 1918, and one female and one male 
taken in the same locality by Mr. R. S. Bagnall (date unknown) 
on Bedstraw (Galium). 
Sericothrips staphylinus, Haliday (nec Uzel). 
1836. Sericothrips staphylinus Haliday, Ent. Mag., ili, p. 444. 
1852. be. a Haliday, in Walker Homopt. Ins. 
Brit. Mus., p. 1103. 
1913. Pf 3 Williams, Journ. Econ. Biol., 
vill, p. 219 (in part). 
1913. hs - Bagnall, Journ. Keon. Biol, viii, 
p. 282 (in part). 
Female (brachypterous).—Measurements.—Total length about 
09mm. MHeadlength about 0°85 mm.; width0-172mm.; prothorax 
length 0:132 mm.; width 0-212 mm. ; pterothorax length (dorsally) 
0:120 mm.: width 0-220 mm.; abdomen width about 0:°300 mm, 
Antenne: Segment... «1, «<2..'38> 4,39 .6.\ 72 8 
Length (x). 19 41 52 42 42 48 8 12 
Width, (4). :3L., 29%. 21) 2a) 2 Ss | Gates 
Total length of antennz 0°288 mm. 
This species differs from S. gracilicornis chiefly in the rela- 
