1958] 
Christiansen — Collemboia 
63 
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T etracanthella pilosa Schott 
Tetracanthella pilosa Schott, 1891. Ent. Tidskr. 12:191. 
The specimens at hand agree with the descriptions and 
figures in Stach quite well. The only small difference noted 
was that the furcula was relatively longer. The species is 
quite rare in the region under consideration. It has been 
taken from : Lebanon : Ain Z’Halte Cedars, above forest, 
XT 52 ; Syria : Pine Forest, Northern Latakia, vm ’53. 
Folsomides americanus Denis 
Folsomides americanus Denis 1931. Bui. Lab. Zool. Portici 26:69-170. 
I have nothing to add to the comments of Cassagnau 
and Delamare {op. cit.) concerning this species except that 
comparison with North American material shows it to 
be identical with the specimens at hand. This material 
had previously been identified as Folsomides parvus. The 
species is widespread and abundant through the lowland 
and lower mountain regions of the area under consideration. 
Taken from Lebanon : Beirut, campus American Uni- 
versity, many dates from 1951 through 1953 ; Souk el 
Gharb, vm ’53, between Kfardebiene & Bskinta, v ’53; 
Beit ed Dine, XI ’53 ; Saida, XI ’51 ; 14 Km. South of Saida, 
XI ’53 ; 2 km. East of Rayak, vn ’52 ; Farayha, v ’53. Syria 
Latakia, oak grove just below Turkish border, vm ’53. 
Folsomia 
This genus is the best represented Isotomid genus in 
the area. There are probably five species occuring in the 
area, and the nature of the population isolation and vari- 
ation within several of the species concerned merits a great 
deal more study. Cassagnau and Delamare (op. cit.) de- 
scribe one new species and mention the capture of three 
single specimens they determined as Folsomia ksenemani , 
I feel certain that these were in fact single-eyed specimens 
of the same species I have identified as F. penicula Bagnall. 
For this reason I have not included ksenemani in the list 
below. It is quite probable that larger series in each case 
would have shown the more typical four-eyed forms in 
each population. 
Folsomia quadrioculata Tullberg 
Isotoma quadrioculata Tullberg, 1871. Ofv. Kongl. Vet. Akadm. Forhandl 
27 (1): 143-155. 
