THE PHYLOGEXY OF THE TRACHE.E IN APvAXE-E. 553 
(2) Forms with the tracheal spiracles approxi- 
mated and moved more or less toward the hinder 
end of the body. — All the remaining ti*acheate spiders 
come under this heading,^ and may be considered in two 
groups, viz. group A, those in which the entapophyses of 
the tracheal system are non-respiratory (Filistatidas, 
Sicariida?, and Palpiinanidfe), and, gToup B, those in 
Traubeal apparatus of Filistata capitata (after Lamy). ec. t. 9. 
X' on-respiratory eiitapopliysis. 1. tr. Lateral or ti-aelieal sac. 
Magn. lUO. 
which tliese entapophyses have been transformed into 
trachete (including all the remaining families). 
A very simple and interesting type of trachea3 of the first 
group is that of Filistata (text-fig. 20), which is known to 
us from Lamy’s description. 
The simplest and most usual type of the second group, a 
* In some cases, e. g. Argyroneta, tlie common tracheal spiracle 
ap 2 iears to have secondarily moved forward again. 
