428 AUGUSTA RuCKEK, "Ji 



1 



4. Male. Flagellum 9 jointed, terminal jomt with one wliorl, 

 eiglitli Segment without tlie M^horl and witli just two of the smooth 1 

 setae on tlie upper snrface, while tlie seventli segment had this wliorl. 



5. Female. Flagellum 12 jointed, terminal Joint with the two 

 whorls of plumulose setae and the other joints in every respect I 

 normal. ! 



From this it is seen that very little definite Information can be : 



had in regard to this appendage of the last stage, until more material l 



has been obtained. It lias seemed probable that this caudal appen- l 



dage would have nearly reached its limit in the number of joints \ 



for this stage just preceeding the adult, since in most respects the ! 

 animal is in the condition of the adult. ^} 



I f< 



y. Couclusion. * i 



i 



In completing this piece of work on Koenenia ivlieeleri I would | 



express my disappointment in failing to gain more Information on its | 



life history. This could not be done, because of the great gaps in periods j 



of collecting which were due to lack of rains. Nothing can be done 



on the embryology until something further is known of their habits ( 



or until a suitable nest provided with proper food can be devised \ 



for keeping the animals indefinitely where they can live and breed || 



as if unconfined. I believe, however, that a little Information has ,i 



been obtained in regard to the habits and especially in regard to I 



the post-embryonic development of this interesting Arachnid of the \ 



Order Microthelyphonida. This Information, viewed in the light of <- 



the biogenetic law, will enable us to say which of the species of ., 



Koenenia has gone farthest in its development. From a study of '• 



the reproductive appendages it was seen that the female of Ä'. ivhecleri i 



passed through a stage in which the adult female of K. mirabüis i 



remains throughout life. From tliis fact we might perhaps expect 



the appendages of the still unknown male of K. mirabüis to be like i 



those of the last stage in the male of K. wheeleri. It is with great j 



interest I await the finding of this sex of the European species. \ 



1) After this paper was sent to the publisher I obtained more 

 material in further collecting, which furnished definite Information in regard 

 to the flagellum. On Aug. 5th, I took eight specimens of the last stage, 

 three of which possessed perfect flagella. The flagellum in all three cases 

 was made up of fourteen joints ; the last or terminal Joint was furnished 

 with two whorls of plumulose setae. 



