42 Scientific Proceedings, Royal Dublin Society. 
the two which are present in a reduced condition in most species 
of Entomobrya, and in a vestigial condition in the species now 
under discussion. And as Hntomobrya is, in most respects, more 
specialized in its structure than Orcheselia, we may reasonably 
suppose that this suppression of ocelli and of antennal segments 
has taken place independently in many of the genera into which 
the order has branched off. 
