1956] 
Christiansen — Collembola 
131 
tened, ovoid, bifid, sensory knobs; p.a.o. with 16 complex 
lobed sensory papillae arranged in a narrow ellipse; 
tubercles of the integument very coarse on head and 
dorsal surface of body, smaller on antennae with line of 
demarcation sharp; unguis untoothed; empodial appendage 
expanded basally but without lamella ; filamentous ex- 
tension of appendage, reaching three-quarters distance 
from base to apex of unguis; fourth antennal segment 
without unusually thick setae, but with well developed 
subapical bulb in a deep pit; pseudocellar formula: dorsal 
surface — 32 / 123 / 333330 , ventral surface — 0 / 000 / 111100 ; 
each leg base has a pair of pseudocelli; no clear ventral 
organ (see discussion below). 
Text-figure 1. Characteristic structures of Onychiurus fazii n. sp. 
1. Male ventral organ, specimen from vie. Sidon, Lebanon. 2. Hind 
unguis, specimen from Ain Z’halte Cedars, Lebanon, external edge 58 
mi.cra. 3. p.a.o., same, specimen, length organ 60 micra. 4. Habitus para- 
type, length 2.4 mm. 
