NOTES ON BRITISH THYSANOPTERA. 281 
The male, which has not previously been seen, is paler thaw 
the female, with the first antennal segment very pale, the second 
and third yellowish, the fourth yellowish at the base to greyish- 
brown at the tip, the fifth yellowish at the extreme base, the rest 
of the fifth and segments 6, 7, and 8 greyish-brown. There are 
no stout spines on the ninth tergite. In the male, as in the 
female, there is a long, fine, slender comb on the posterior 
margin of the eighth abdominal tergite. 
Thrips nigra, sp. nov. 
Female (Macropterous).—Measurements.— Total body length 
1-1 mm.; head length 0:096 mm., width 0:140 mm.; prothorax 
length 0-120 mm., width 0:200 mm.; pterothorax length (dorsally) 
0-200 mm., width 0-272 mm.; abdomen width about 0°320 mm. ; 
wing length 0-70 mm., width 0:052 mm. 
Antenna: Segment . MS ee. MS Rn A At gg Sy 
Length (x). 2 (20) SSSO AT) aL Sor volley 2k 
Width () . Dy OI oe CAN p20 Ola one 
Colour.—Body uniformly dark brown ; legs similar except for the 
tip of the fore tibiew, which are a little paler. Antennal segments 1, 2, 6, 
and 7 as dark as the body; 3 paler, particularly at the base, 4 darker 
than 3, 5 almost as dark as 6. Ocellar pigment red-brown. Wings 
pale brown at the base, then smoky brown from the basal quarter to 
the tip, particularly near the anterior and posterior margins, some 
specimens being quite distinctly pale along the middle of the wing. 
Hind wing very pale smoky brown. 
Head almost one and a half times as wide as long, widest across 
the cheeks, which are distinctly arched. Hyes somewhat large, pro- 
jecting a little laterally ; distance between the eyes one and a half 
times the width of an eye; distance from the eye to the back of the 
head almost equal to the length of the eye. Ocellc well forward, 
forming a slightly obtuse triangle, the posterior ocelli half their 
width from the margin of the eye. Ocellar spines short and incon- 
spicuous, one on each side of the anterior ocellus. <A row of three 
short spines behind each posterior ocellus on a level with the hind 
margin of the eye, and one or two short spines on the cheeks. The 
hind part of the head, almost to the level of the eyes, distinctly 
striated. Mowth-cone reaching two-thirds across the prosternum, 
rounded at the tip. Antenne two and two-thirds the length of the 
head; comparatively stout; the first segment slightly tapering, the 
second barrel-shaped with a slight constiiction at the base; the third 
tapering at each end with a distinct pedicel at the base ; the fourth 
and fifth each with a distinct neck at the base; the sixth widest at 
its basal third, tapering gradually to the apex ; the seventh continues 
the line of the sixth and tapers slightly to a rounded point. Short, 
forked trichomes dorsally on the third and ventrally on the fourth 
segments, : 
Prothorax one-quarter longer and two-thirds wider than the 
head, two long spines at each hind angle, two short ones on the 
hind margin; one short, forwardly directed spine at each fore angle ; 
only minute spines on the fore margin and scattered over the pro- 
ENTOM.— DECEMBER, 1916, BB 
