71 
Psyche 
[ J U NE-Se PTE M BER 
acuminate, with striking central ridge, and basal part 
inner lamella expanded. Tenent hair acuminate. Tenaculum 
with four teeth and single large basal seta. Manubrium 
with one pair of ventral and 24 dorsal setae. Dens with a 
double row of ventral setae, and four dorsal setae. Mucro 
with two teeth and straight ventral margin. 
Discussion 
This species can readily be separated from all described 
species of Isotomina by the well developed blunt “sensory” 
seta on the last abdominal segment. In other respects this 
species seems to be most closely related to 7. thermophila, 
but it may also be separated from this species by the 
small eye D, by the presence of a tibiotarsal subsegment, 
and by the fact that the longest abdominal setae are three 
times as long as the shortest. 
The present species shows a good deal of variation, 
particularly in respect to the eyes. The eye D is usually 
considerably smaller than the remainder but in a few 
specimens it is entirely absent. The eyepatch shows some 
tendency towards constriction in the middle, and in a few 
specimens it is actually divided into two patches. The 
clarity and presence of the tibiotarsal subsegment varies 
a great deal although most specimens show this on the 
third pair of legs. 
Type locality: Antelias, Lebanon, XI ’52. Other collec- 
tions: Lebanon: Vic. Nabeth Safa, xi ’53; Beirut, Ameri- 
can University campus, v ’52 ; Barouk Cedars, vi ’53 ; 2 km. 
E. Rayak vn ’52. Syria: S. Latakia. 
Vertagopus aborea Linne 
Podura arborea Linne 1758. Systema naturae Edit. 10 Holmiae: 609. 
The specimens at hand agree well with available descrip- 
tions and specimens except for two things : first, the color 
is not dark purple or purple blue but medium to pale gray- 
blue. Second, the fifth and sixth abdominal segments have 
setae twice as long as the shortest setae of these segments. 
As Stach points out, from the varied descriptions of this 
form it would appear that either a species complex or a 
geographically variable form is involved. In view of the 
general similarity of the present specimens with European 
