SPRING NUMBER 65 
woolly covering of the pine bark and building a covering over 
the colonies of aphids. Another advantage of the ants, which, 
by the way, is mutual, is by eating the honey-dew secreted by 
the aphids. 
NEW THYSANOPTERA FROM FLORIDA. IX. 
J. R. WATSON 
71. Idolothrips flavipes Hood. 
From dry leaves on the ground in the forest. Hog-town Creek, Feb. 27, 
1921. Gainesville, March, 1921. These represent but the third capture 
for this species—all from dried leaves. It was described from Illinois and 
Morgan has recorded it from Tennessee. 
72. Hoplandrothrips pergandei (Hinds). (Phloeothrips pergandei Hinds.). 
Sweeping grass in pasture. Gainesville, Fla., Feb. 25, 1922. Previously 
reported from Amherst, Mass. (type locality) and Tennessee (Morgan). 
73. Hindsiana pini n. sp. 
Head, thorax, and tube brown; most of abdomen, legs and antennae light 
yellow. 
Measurements: Total body length 1.1 mm. Head; length 0.16, width 
0.15 mm.; prothorax, length 0.16, width 0.25 mm.; mesothorax, width at 
the base 0.23 mm.; metathorax, greatest width 0.18 mm.; abdomen, greatest 
width 0.28 mm.; tube, length 0.11, width at base 0.05, at apex 0.03 mm. 
Antennae: total length 0.28 mm.; segment 1,18; 2,40; 3,438; 4,48; 5,48; 
6,40; 7,88; 8,382 microns. 
Head a little longer than broad, cheeks slightly arched. Postocular 
bristles long, colorless and bearing a small knob at the apex; a pair of 
minute bristles opposite them near the median line, one behind each ocellus, 
and one directly behind each of these and opposite the posterior margins 
of the eyes. Eyes small, not protruding, black, non-pilose, facets large. 
Ocelli large; posterior pair situated opposite the anterior third of the eyes 
but not touching their margins; yellow, bordered with dark crescents. 
Mouth cone reaching 2-3 across the prosternum, rounded at the end. An- 
tennae clear yellow except segment 1 which is shaded with brown and 7 
and 8 which are brown. Segment 1 cylindrical; 2 urn-shaped; 3-5 short 
clavate; 6, ovate, brownish yellow; 7, obovate; 8, conical. Bristles and sense 
cones short, colorless and inconspicuous, one each on the outside near the 
apex of segments 5 and 6 fairly long. 
Prothorax about as long as the head and half again as wide; one strong 
knobbed bristle on each posterior angle and a similar one on each coxa; a 
short one on each anterior angle and one midway on each side. Mesothorax 
much narrower than the prothorax and the sides abruptly converging pos- 
teriorly. Metathorax but little wider than the posterior border of the 
mesothorax. This very narrow pterothorax gives the insect the appearance 
of having a slender waist. Legs clear yellow except the bases of the fore 
femora which are clouded with brown. Fore femora slightly enlarged. 
Fore tarsus with a short curved spine. Wings well developed but their 
membranes not attaining the end of the abdomen; that of the hind wings 
clear, of the forewings gray, narrowed in the middle, fringed with long 
hairs, three interlocated ones. 
