1S56] 
Christiansen — Collembola 
127 
zschokkei; 2 fifth and sixth abdominal segments with a 
number of very long setae prominent on the sixth, where 
they make a brush-like cluster at the end ; anal horns small 
and similar in structure to small setae; third antennal 
sense organ with four slender protective papillae, and a 
single peg-like sensory rod; two large, flat sensory clubs, 
irregularly clavate in dorsal (or ventral) view, but slender 
capitate structures when seen laterally; fourth antennal 
segment with a small but definite bulb in a subapical 
pit and 16 large, curved, slightly blunted setae present 
on the apical part; no ventral organ present; P.A.O. of 
18 irregular tubercles arranged in a rough ellipse; claw 
simple, untoothed with empodial appendage acuminate 
and reaching about half distance from base to apex of 
unguis, pseudocellar formula : dorsal surface — 32/122/ 
223320, ventral surface — 1/000/001100. 
Variation and Discussion. This species is very similar 
to O. zschokkei in general structure. The chaetotaxy, P.A.O. , 
and general appearance are all similar. It differs in the 
structure of the third antennal segment sense organ, and 
the range of variation in the number of lobes of the P.A.O. 
In the present species this ranges from 14-20, whereas in 
zschokkei it varies from 20-30. There appears to be a 
great deal of variation in the pseudocelli of butrosi; how- 
ever, it is difficult to determine how much of this is a 
matter of technical difficulties and how much is real varia- 
tion. The commonest condition appears to be that de- 
scribed for the holotype. The second thoracic segment 
may have two and the second abdominal segment one 
pseudocellus. Abdominal segments three and four occasion- 
ally have two pseudocelli on each side of each segment. 
Type locality: “The Cedars,” Lebanon, elev. 1900 m. 
Also taken from: American University Campus, Beirut, 
Lebanon, V-29-52; Barouk Cedars, Lebanon, VI-14-53; 
Vicinity Bludane, Syria. 
Onychiurus fimetarius Linne 
Onychiurus fimetarius Linne, 1766, Systema Naturae, ed. 12. 1(2): 1013. 
Cassagnau reported this species from five localities. 
2 Extracts from a paper upon O. zscokkei by H. Gisin now in press. 
