JOURNAL OF ENTOMOLOGY AND ZOOLOGY 191 
there is a statement to the effect that there is some indication of 
an abdominal ganglion back of the cephalo-thoracic mass in 
pseudoscorpions. I have made series of Chelifer as well as a 
large number of dissections and have found no indication of 
such a ganglion in any of the specimens. 
Meruops. Due to the very resistant chitin it was very difficult 
to make good serial sections. Fluids which softened the chitin 
to any degree, ruined the internal organs at the same time. A 
few perfect series were obtained through the bodies of some of 
the younger specimens, but with the older ones it was necessary 
to remove a large part of the chitin of the body-wall, or to 
remove the nervous system entirely. 
Figure 1. The central nervous system of Chelifer. HH, the nervous system from 
above, showing some of the nerves, cells and groups of cells which 
may in part represent ganglia and some of the tracheal tubes in the 
nervous system. The brain is at the top of the figure. I, central 
nervous system of Chelifer shown in ventral view. The palpal nerves 
are those at the top of the figure. Compiled from several nervous 
systems. X50. 
Most of the usual neuroglical methods were used, such as those 
of Golgi, Cajal and methylene blue, but with small success. The 
best preparations were obtained by fixing in Flemming’s fluid 
and staining on the slide with methylene blue, neutral red or 
hematoxylin. For a clear idea of the form of the ganglion and 
nerves, dissections were made of fresh and preserved specimens. 
Usually the dorsal body-wall was removed in one piece and the 
