218 AUGUSTA RUCKER. 



breadth of the animal across the mid-ventral line. Another 

 characteristic of K. f lor en cite, which appears even in the 

 delicate exoskeleton of the youngest stage, is a tongue- 

 shaped thickening of the sternum between the fifth pair of 

 appendages. 



Chelicerag. — On the ventral surface of the proximal joint 

 of the chelicerae three setae arise in a line parallel to the 

 sides of the labrum. These setae present distinguishing 

 features characteristic of the species. In K. f loren cise the 

 first one of these hairs is very large, — in fact, it is the largest 

 hair to be found on the entire body of the animal ; while the 

 other two setae are very small in proportion. The corre- 

 sponding setae in K. wheeleri which are similarly arranged 

 are all of the same size, blunt, and delicately plumiilose near 

 the ends. In the case of K. mirabilis the first of these 

 hairs is large, but not nearly so large as the corresponding 

 ones in K. florencias. The size and relative proportions of 

 these seta3 can best be ascertained from an examination of 

 figs. 9, 10, and 11 of the plate. The two distal joints have 

 each eight teeth with their denticles. The teeth, in recently 

 killed specimens, show a delicately plumulose structure, a 

 condition which was also found in K. wheeleri. On the 

 fixed blade the row of teeth ends with a sharp angle, while 

 the moveable blade, which ended with a number of serrations 

 in K. wheeleri, terminates with the last tooth. A peculiar 

 arrangement in the fixed blade of K. f lorencise, which is so 

 prominent as to make it worth mentioning, can best be made 

 out from fig. 12 of the plate. This condition, though not so 

 prominent, is also observed in the movable joint. It is a 

 bulb-like attachment appearing in the cavity of the blade, on 

 a line with the penultimate tooth. Extending from that side 

 of the bulb nearest the teeth is a chitinous rod which becomes 

 fused with the wall of the blade after extending down the 

 cavity for its whole length. 



Other Appendages. — The pedipalps conform throughout 

 to the corresponding appendages in the other known species. 

 The last leg, like that appendage in K. wheeleri, has, on the 



