1957] 
Christiansen — Collembola of Lebanon 
79 
cation. In both populations the aethiopica type of mucronal 
form was present in addition to the normal type. 
Cyphoderus ( Cyphoda ) grassei 
Cassagnau & Delamare-Deboutteville 
Cyphoda grassei, Cassagnau & Delamare, 1951, Biospeologica 75: 384-385. 
This species was described by Cassagnau and Delamare 
from a single specimen. The relative size of the mucro 
and dens (1-10) was taken as a characteristic of the species 
and upon this basis it was placed in the genus Cyphoda. 
I have several series of specimens which I have identified 
as this species. In one of these I have five specimens. 
The relative sizes of the mucro and dens varying as fol- 
lows: 1-10, 1-9, 1-8.5, 1-7.5, 1-7. In a second series of 
three specimens the sizes are : 1-10, 1-6, and 1-5.5. In still 
a third series both specimens have a mucronal dentes 
ratio of 1-5.5. This presents a problem since the sole 
basis for separation of members of the genus Cyphoda is 
the relative mucronal length. Whatever the eventual de- 
cision concerning this genus, the species grassei can no 
longer be considered part of the genus. 
In addition to this variation in mucro the species shows 
another peculiarity in that the tunica is absent in a few 
specimens, particularly young forms. In over 95% of 
the specimens seen, a clear tunica is present on the ungues. 
Perhaps the most unique characteristic of the group is 
the shape of the mucro. This is particularly noticeable 
upon specimens having a relatively large mucro, but 
can be seen upon all. The mucro has in addition to the 
apical hook, a very shallow anteapical tooth. This con- 
dition is always the same and places it directly on a line 
between the two groups bidenticulati and inermes. 
Distribution: Hammana, Lebanon, August 28, 1952 and 
July 28, 1957. Vic. East Base Quornet es Sauda Lebanon, 
elev. 2200 meters, July 1, 1953; Vic. Turkish Border 
Latakia, Syria, August 2, 1953, lat. 35° 50" long. 36° 
01"; Dahr el Ain, Lebanon, October 10, 1951. 
Cyphoderus (Serroderus) spinatus n. sp. 
Plate 6, figures 9-11, Plate 7, figure 8 
Body oval, head bluntly oval with well developed mouth- 
