124 
Psyche 
[December 
with the anterior border of the anal horns taken as 10. 
The unguis is untoothed with the empodial appendage 
having a long filiform extension slightly exceeding the 
apex of the unguis. The anal horns are curved and stout, 
about as long as the hind unguis. A small but well de- 
veloped cuticular fold exists in the region of the furcula. 
Pseudocellar formula: Dorsal surface — 32/022/333420. 
No pseudocelli seen on ventral surface of animal. 
Variation and Discussion. 1 The number of lobes on 
the p.a.o. varies from 28 to 36, with even smaller numbers 
occurring on obviously immature specimens. The male 
specimens never display any special ventral organ. The 
pseudocelli are constant except for a pair of ventrals ap- 
pearing occasionally on the head. The lateral pseudocelli 
on the third thoracic segment, and the lateral posterior 
pair on the fourth segment, are not always clearly visible, 
but further examinations have led me to believe that this 
is a matter of technique and that they are always present. 
The chaetotaxy of the first thoracic segment varies a 
1 Unless otherwise stated, the variation mentioned in each of these 
sections is that found in normal specimens of apparent sexual maturity. 
Explanation of Plate 7 
Figs. 5-8. Onychiurus levantinus n. sp. Fig. 5. Third antennal seg- 
ment organ paratype (male). Organ length 18 micra. Fig. 6*. Posterior 
border fifth abdominal segment, specimen from “The Cedars,” Lebanon. 
Side view. Fig. 7. Tergum first thoracic segment, same specimen. Side 
view. Fig. 8. Posterior margin second abdominal segment, same speci- 
men. Figs. 9-11. Onychiurus butrosi n. sp. Fig. 9. Side view third anten- 
nal segment organ, specimen from Hermel, Lebanon. Length of sensory 
clubs 4 micra. Fig. 10. Ventral view, same organ and specimen. Fig. 11. 
p.a.o. , same individual. Magnification as above. Figs. 12-15. Onychiurus 
fazii n. sp. Fig. 12. Claw, specimen from -Latakia, Syria. External edge 
unguis 36 micra. Fig. 13. Third antennal segment organ, specimen as 
above. Organ length 20 micra. Fig. 14. Sensory clubs of third segment 
organ, another specimen from Latakia. Fig. 15. Sensory clubs as above, 
specimen from Ain Z’halte, Lebanon. 
* Dotted lines in figures 6, 7 and 8 represent limits of variation of setae 
bases in more variable setae. 
