CARPENTER— On two new Irish Species of Collembola. 41 
each side of the head (fig. 9). Each foot with a delicately-clubbed 
tenent hair, a large claw with three minute teeth, and a small 
simple acuminate claw (figs. 12, 13). Fourth abdominal segment 
less than twice as long as the third. Spring with dens twice as 
long as the manubrium; mucro with apical and dorsal teeth and 
a basal spine (fig. 15). 
In colour E. anomala is dark bluish-violet, with the hinder 
edges of the segments, large patches on the mesothorax and 
metathorax, and streaks and spots on the abdominal segments 
clear yellow. The head is mostly yellow with violet mottlings, 
while the feelers and legs are of a paler violet than the body, and 
the spring yellowish-white. The antennal organ (fig. 11) consists 
of a small hemispherical papilla, surrounded by a few curved 
bristles. The catch (of which a rather oblique view is shown in 
fig. 14) has three somewhat blunt teeth on each limb. 
The relatively short fourth abdominal segment, and the six 
distinct segments of the feeler, are characteristic of the genus 
Orchesella, to which this species—by its facies and general 
structure undoubtedly an Hntomobrya—shows, therefore, a 
decided likeness. In the extreme reduction of the two hinder 
median ocelli (fig. 9) of the present species we have another 
approach towards the condition in Orchesella, which has six ocelli 
only on each side of the head. Schaffer! described this latter 
condition in a German species, which he called L. orcheselloides; but 
the fourth abdominal segment was in that case seven to eight 
times as long as the third. In species of Entomobrya the two 
hinder median ocelli are generally smaller than the others, and a 
minute ring may be present at the base of the feeler (representing 
the distinct basal segment of our present species, and of Orcheselia), 
as well as an indication of the small third segment. It may be 
concluded, therefore, that the four-segmented feeler, which charac- 
terises so many genera of the Collembola, has been derived by 
the suppression of segments from a multi-articulate form, probably 
passing through the six-segmented condition that is preserved in 
Orchesella. The six ocelli of Orcheselia remain after the loss of 
1 (©, Schiffer, ‘‘Die Collembola der Umgebung yon Hamburg und benachbarter 
Gebiete.’? Jahrb. Hamburg. Wissensch. Anstalt, xiii., 1896 (p. 198, figs. 114-116). 
