222 AUGUSTA RUCKEE. 



Immature Stages. — These would be hardly worth men- 

 tioning, so fragmentary is the information obtained from two 

 periods in the life-history, were it not that these two stages 

 may give characters which phylogenetically are of the utmost 

 importance. As is always expected in considering the young 

 of any Arachnid, the hairs are few in number when compared 

 with the adult, so these points can be passed over lightly 

 except where hairs appear as specific characters of K. 

 florenciee. Of special importance, however, is the develop- 

 ment of the reproductive appendages of the second and third 

 abdominal segments. We saw that these appendages of K. 

 wheeleri, in passing through their developmental stages, 

 not only gave an inkling of the condition to be found in the 

 male appendage of the adult, but also of the relative position 

 of the species within the order. In K. f lorenciae the older 

 known stage presents characters in the reproductive appen- 

 dage which become entirely lost in the adult female, but 

 which resemble, in their possession of papilU^, the male 

 appendages in K. wheeleri. The appendage of this stage 

 in K. f lorenciae, with greater elaboration brought about in 

 its further development, probably becomes the male appen- 

 dage of the adult ; farther collection, however, at different 

 times of the year is needed to prove the truth of this con- 

 clusion. 



Youngest known Stage. — The labrum presents the 

 peaked condition found in the adult. One lateral sense-organ 

 is present on each side. The number and arrangement of 

 setfe on the carapace agree with the adult condition. Only one 

 cephalothoracic sternal hair is present ; this is situated on the 

 mid-ventral line. No sensory hairs appear on the first 

 metatarsus. The flat, hollow, and slightly curved seta situated 

 on the outer side of the third metatarsus, one third of the 

 distance from the proximal end, is present as in the adult. 

 The characteristic sette of the proximal joint of the chelicera) 

 occur as in the adult. The arrangement of seta? on the 

 ventral surface of the abdomen is very regular. Beginning 

 with the second segment and ending with the seventh segment 



