Fnrther Observations oii Koenenia. 425 



wlieii I found tliis perfect specimen after liaviiig obtained several 

 of the later stage wliicli did not possess so many joints in the 

 flagellnm. Tlie explanation is, probably, tliat the longer appendage, 

 wliicli was more liable to injury, liad been broken and liad only partly 

 regeuerated. 



3. Last Stage. 



Eiglit specimens in all represent the number of individuals in 

 my possession which were on the treshhold of matnrity. Three of 

 these are males and five are females. The first one of this stage was 

 taken on April 16th, On the day I captured this specimen I was 

 hastily examining the material which I had just brought in and was 

 tabnlating it when I ran upon one individual smaller than the 

 others, which sported a raost curious flagellum. This appendage was 

 made up of ten joints and the ninth presented a condition I have 

 never seen before nor since. for it appeared made np of two fused 

 Segments. This was evidently merely an anomaly and represented 

 nothing of importance. When I finished examination of this curious 

 organ I turned to the body to which it belonged and found I was 

 unable to obtain a clear view of the region of the second and third 

 abdominal segmeuts so I put it aside for later and more rainute 

 examination, assigning it in the table to the undetermined column. 

 Later it proved to be an immature female of the last stage. 



Cephalothorax. The labrum has five pairs of short curved 

 setae. This is the number characteristic of K. mirabiUs. Three 

 pairs of lateral sense organs are present. In one individual there 

 was an exception, for the right side had three of these sensory 

 Organs while the left bore only two. The arrangement of the dorsal 

 cephalothoracic hair is normal. The sternal cephalothoracic setae 

 are arranged in a transverse row of six (soraetimes five), which is 

 usually irregulär near the mid ventral line, and two anterior rows, 

 which are arranged to form a Y with the seta of the apex some- 

 tinies merging into the transverse row at its region of irregularity. 

 Five of the individuals of this stage of development had eleven 

 setae. two had ten, and one had only nine. 



The chelicerae, like those of the adult, possess eight teeth, and 

 eight fairly good sized denticles. which on the fixed Joint terminate 

 in serrations. 



The Appendages. Since all of the appendages outside of 



