238 
Psyche 
[December 
overhanging. Antennae separated by somewhat more than the 
width of segment 1; segments 3 and 4 much as in phaseoli 6 but 
more globose and with the pedicel of 4 more abrupt and shorter; 
5 slightly slenderer; 8 longer and slenderer; 3 and 4 with forked 
trichomes. Wings of fore pair with about 18 short, inconspicuous 
bristles on costal margin, those in basal portion of wing half as 
long as distal ones and less than half the width of wing , fringe about 
as long as distal bristles; anterior vein with one near fork and 
one near tip, very inconspicuous and pale; posterior vein with 
about five similar bristles. Abdomen with segment 9 long, 2.5 
times the length of 10 and about 1.2 times as wide at base as long, 
width at apex ( across bases of lateral bristles) about 0.66 that at 
base, its inner pair of dorsal bristles shorter than outer, which are 
slightly longer than segment 10, both pairs approximate and dis- 
posed in a straight transverse line. 
Measurements of holotype (9): Length 1.05 mm.; head, 
length 0.118 mm., greatest width (behind eyes) 0.174 mm., 
least width (at base) 0. 160 mm.; eyes, length 0.072 mm., width 
0.044 mm., interval 0.080 mm.; prothorax, median length of 
pronotum 0.104 mm., width 0.212 mm.; pterothorax, width 
0.255 mm.; fore wings, length 0.735 mm., width at middle 
0.044 mm., near base 0.057 mm.; abdomen, width 0.261 mm.; 
segment 8, length to fringe 0.078 mm.; segment 9, length 0. 128 
mm., width at base 0.156 mm., width across bases of lateral 
bristles at apex 0.104 mm.; segment 10, length 0.050 mm., 
width at base 0.082 mm. 
Antennal segments: 12345678 
Length ( M ) 43 38 35 22 8 25 
Width ( M ) 23 30 22 21 18 17 9 5 
Total length of antenna (approximate only) 0. 23 mm. 
Described from a unique female taken from bamboo at St. 
Annes, Trinidad, in the British West Indies, March 28, 1915, by 
C. B. Williams [C. B. W. No. 6121. 
The elongate and only slightly tapering ninth abdominal 
segment seems to be unique in the genus, occurring in none of 
6 See Psyche, vol. XIX, PL 8, fig. b; 1912. 
