1958] 
Christiansen — Collembola 
71 
Character 
mucro 
manubrium 
4th ant. seg. 
3rd ant. seg. 
“sense organs” 
longest abdominal 
setae 
crassicauda 
less than 14 as 
deep as long 
with 4 ventral setae 
without blunt 
“sensory” setae 
peg-like, subcylin- 
drical 
1.5 X smallest 
ie v antina 
more than 1/2 as 
deep as long 
without ventral 
setae 
with clear blunt 
“sensory” setae 
oval 
2-3 X smallest 
There is some variation in the p.a.o. of the present 
species. In most specimens the margins are entire but 
a few show clear indentation in one or both margins. In 
most respects there is almost no variation in the large 
series seen. 
Known only from type locality : Lebanon : Kadischa cave ; 
moss near spray zone of waterfall near mouth, v ’53 (30 
specimens) . 
Isotomina bitub erculata (Wahlgren) 
Although the original description was not seen the speci- 
mens at hand agree very well with the available descrip- 
tions. The eye number is six per side. Some specimens have 
the eyes so heavily pigmented as to be difficult to count 
but observation during clearing with Potassium Hydroxide 
showed the actual number to six in every case examined. 
The posterior abdominal setae are unusually long in adults 
varying from .045 to .066 mm. This may very well be 
the same species described by Cassagnau and Delamare as 
Isotomina pontica. In some small specimens the median 
eyes are invisible until clearing is complete and this might 
account for the difference in identification. Distribution: 
Lebanon :2 km. E. Rayak, vn ’52; Hadeth, vn ’53; below 
Bakich, v ’53; 14 km. S. Saida, xi ’53. Syria: Northern 
Latakia pine forest, vil ’53. 
Isotomina pontica Stach 
Isotomina pontica Stach 1947. Acta Monog. Polska Akademia Umiejet- 
nosci : 267. 
Cassagnau and Delamare reported this from 3 localities: 
