298 
Psyche 
[December 
eyes, length 0.111 mm., width 0.065 mm., interval 0.084 mm.; 
prothorax, length 0.135 mm., width (inclusive of coxae) 0.323 
mm.; pterothorax, width 0.350 mm.; abdomen, width 0.540 
mm.; tube, length 0.161 mm., width at base 0.050 mm., at apex 
0.029 mm. 
Antennal segments: 12345678 
Length 48 69 78 61 57 51 44 39 
Width (/^) 30 32 28 31 28 26 21 11 
Total length of antenna 0.45 mm. 
Male (macropterous) . — Apparently similar to female in all 
respects, excepting for the smaller size and slenderer form. 
Described from 11 females and 7 males taken by Mr. J. C. 
Faure at Malelane, Transvaal, December 12, 1918, ‘^on pawpaw 
tree trunk’’ (No. 403). 
A particularly beautiful species, quite distinct from its 
North American congener, and one which I take pleasure in 
naming after its discoverer. 
Plectrothrips atactus sp. nov. 
Female (brachypterous). — Length about 1.8 mm. Color 
pale brownish yellow, shaded with blackish brown on front 
margin of head, cheeks, posterior margin of prothorax, meso- 
thorax (particularly at sides) and second abdominal segment; 
tube with a reddish cast; legs and antennae yellow; no subhy- 
podermal pigmentation except the three, bright-red, ocellar 
spots. 
Head smooth above, roughened at sides, 1.2 times as long as 
wide, broadest midway between eyes and base of head, cheeks 
rounded; postocular bristles pointed, much shorter than eyes, 
almost lateral in position; other cephalic bristles minute. Eyes 
moderately small, hardly one-third as long as head and about 
0.4 as wide as their interval. Ocelli situated far forward, the 
anterior one almost between bases of antennae, the posterior 
pair very widely separated, situated close to anterior angles of 
eyes. Antennae of structure normal to the genusq except that 
^See Hood, Ins. Insc. Menstr., Vol. IV, 1916, PI. 1, fig. 4. 
