28 
Psyche 
[March 
lacking setae. Two large setae are present near each lateral 
edge, and a pair of small setae near the anterior border. 
Variation 
The P.A.O. of some specimens shows no indentation in the 
anterior margin, while others have both anterior and pos- 
terior margins indented. The flap-like nature of the an- 
terior margin can be seen in all specimens, although some- 
times only with difficulty. 
In some specimens the pigmented patch bearing the eyes 
is so constricted in its central portion as to give the effect 
of two separate patches. 
In a few cases the second antennal segment has more than 
a single small seta at its base, as many as three having been 
observed. 
The straight setae on the body vary somewhat. There is 
often present a single transverse row of short erect and 
straight setae on the second and third thoracic and on the 
first abdominal segment. These rows vary in their position, 
and one or more of them may be lacking. The long straight 
setae vary somewhat in number, some specimens having 
none on the first abdominal segment and only one pair on 
the third abdominal segment. The median pairs on the third 
and fourth abdominal segments may not be erect and are 
often only slightly longer than the common setae. 
Explanation of Plate 3. 
Weberacantha octa. Magnifications are approximate. Fig. 1. Right 
maxilla of paratype seen from above (900 X) . Fig. 2. Right mandible of 
paratype seen from above (900 X) . Fig. 3. Right hind claw of holotype 
(800 X) . Fig. 4. First antennal segment of holotype, ventral view (800 X) . 
Fig. 5. Left postantennal organ of holotype seen from above (800 X) . 
Fig. 6. Left postantennal organ and anterior ocelli of paratype seen 
from above (800 X) . Fig. 7. Single cephalic seta of paratype, showing 
the surrounding integumentary reticulations (900 X) . Fig. 8. Sense 
organ of the right, third antennal segment of holotype seen from above 
(800 X) . Fig. 9. Apical region of the fourth antennal segment of para- 
type seen from above (800 X) . Fig. 10. Left mucro of holotype, external 
view (800 X). Fig. 11. Left mucro of paratype seen from above and 
slightly to one side (800 X). Fig. 12. Left dens and mucro of paratype, 
external view (800 X) . Fig. 13. Posterior portion of abdomen of paratype 
seen from above and slightly to one side (350 X) . 
