IO Studies on Arthropods. I. 



Paracharon n. gen. 



Cephalothorax not much broader than, long, anteriorly 

 somewhat produced, with a rather short, transverse, anterior 

 margin. Eyes and ocular tubercles completely want- 

 ing (fig. 2 a). First sternum is a light transverse strip more 

 firmly chitinized than the membrane at its front margin, but 

 instead of a sternal labium only a tiny granule with a small 

 vertical seta is seen at the middle of the sternum. Each of the 

 two following sterna have a rather slender, subcylindrical 

 process projecting nearly vertically downward, higher than 

 thick, and with some short, brown setae on the rounded distal 

 part. -- Second abdominal sternite simple, as its posterior 

 part is not marked off or produced. - - Palps considerably 

 shorter than the body, built as in the Charontidae; first tarsal 

 joint (fig. 2 d) with two spiniform processes on each margin 

 and the distal processes much longer than the proximal ; second 

 tarsal joint with three processes on the upper margin, and the 

 claw marked off but not movable. Walking legs as in the Cha- 

 rontidae, excepting that the tibia of fourth pair consists only 

 of two sub joints. 



Remarks. This most interesting genus differs from 

 all other genera of the suborder in having no eyes and 

 no sternal labium. It shows, however, close relationship 

 to the Charontidae in all other features, excepting that 

 the fourth pair of tibiae have only a single secondary arti- 

 culation. 



It may be noted that I have looked in vain for sensory 

 hairs on the places of the eyes. But the normal long tactile 

 hairs on the walking legs and the peculiar small, club-shaped 

 sensory hairs on the distal tarsal joints of the first pair of legs 

 exist, though less numerous, as in the large form Tarentula 

 reniformis I,. (Phrynichus nigrimanus C. I,. Koch) (see H. J. 

 Hansen: Organs and Characters in different Orders of Arach- 



