SUMMER NUMBER 29 
A NEW Species of Symphyothrips (Thysanoptera) from 
Argentina 
J. R. WATSON 
Symphyothrips reticulatus sp. nov. 
Whole body including legs uniform chestnut brown; only tarsi and 
antennal segment 4 a little lighter brown, and antennal segment 3 yellow- 
ish brown. 
Head about .2 longer than broad. Cheeks straight, converging only 
slightly posteriorly. Dorsum with anastomosing reticulations forming a 
network. Hyes rather small, dorsal length considerably less than a third 
of the head; non-protruding; facets large. Ocelli large, yellowish, bor- 
dered by dark crescents; posterior pair situated opposite the middle of the 
eyes; anterior directed forward. Post-ocular bristles conspicuous, consid- 
erably longer than the eyes, widely dilated at the tip, colorless. A small 
bristle behind each posterior ocellus, a pair in front of the anterior ocellus, 
and one at the anterior angle of each eye, and an irregular row of eight 
across the middle of the dorsum. 
Mouth cone large, reaching the mesosternum. Antennae somewhat less 
than twice as long as the head. Segments 1, 2, and 5-7 concolorous with 
the head, 3 yellow with apex almost colorless, 4 yellowish brown. 1 cy- 
lindrical, considerably wider at the base than at the apex; 2 urn-shaped 
with a broad pedicel; 3 clavate, 2.6 times as long as broad, scarcely pedi- 
cellate; 4-6 barrel-shaped, with a long broad pedicel; 7 spindle-form. 
Spines and sense cones colorless. Sense cones on segment 4 especially 
heavy. 
Prothorax considerably shorter than the head and, including the coxae, 
about twice as wide as long. A heavy, colorless spine with a dilated tip 
on each angle; those on the posterior angles less than half as long as the 
prothorax (71 microns); the ones on the anterior angles and coxae a little 
shorter. A pair of conspicuous ones along each lateral margin. Dorsum 
with a number of smaller bristles; the surface covered with faint anasto- 
mosing lines which are more conspicuous along the anterior margin. 
Fore femora short and considerably thickened (about half as wide as 
long). Fore tibiae also short, about five ninths as long as the femora, a 
short thick tooth on the inside of the apex. Fore tarsus with a heavy, 
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