Further Observations on Koenenia. 421 



the ATutral surface of the sixtli segment revealed the fact that no 

 limg' sacs were preseiit. Witli all the reverence of a collector who has 

 only one speciraeii of a iiew species. and isuncertain of obtainiiig others, 

 I put it aside after making- out all I could of its external characters 

 without tlioroug-hly ridding- its exoskeleton of all its soft Contents. 

 A few days later in one afternoon I obtained four small specimens 

 whicli the microscope revealed to be our long lost K. parvuJa, flagellum 

 and all, and without a Single lung sac, while the reproductive 

 appeudages seemed to Surround two apertures, instead of one. On 

 the heels of this discovery came another specimen of the t^^pe which 

 had only two pairs of lung sacs, and several entirely new types. 

 These last and larger specimens appeared entirely alike except for 

 the reproductive organs, which had sonie striking differences. There 

 was something suspiciously familiär about them when I set about to 

 make a thorough comparison of all the new specimens. As soon as 

 KOH was used on K. pannüa a lack of the reproductive orifice was 

 shown, the same happened for the first new specimen I found and 

 then it was evident, without further examination at the time, that 

 I had three diiferent stages in the post-embryonic development of 

 K. ivheeleri of which in the last stage, I knew I was so fortunate as 

 to have both mal es and females. Taking these up in the order in 

 which they appear ontogenetically I v/ill give a description of the 

 three stages. 



1. First known Stage (K. parviila). 



About ninety specimens were obtained from Waller Creek, and 

 in Pease Park, the first ones being taken in the former locality May 1. 



Head. The anterior sensorj^ hairs sometimes show the con- 

 necting bridge near their apex. Only one lateral sensory organ. 

 The number and arrangement of the setae of the carapace the same 

 as in the adult. The mouth shows the same condition of the labrum 

 as Seen in the adult, wliich is not a poor Imitation on a diminutive 

 Scale of the labrum of a locust. The labrum possesses on the margin 

 of eacli side three slightly curved setae, which in the closed mouth 

 overlap the labium. The peculiar furrowed appearance across the 

 labium which appears more pronounced in the adult, seems under 

 the highest power of the microscope, to be produced by rows of 

 the most delicate hairs. The sternum of the cephalothorax has only 

 three setae arranged in an inverted V. 



Chelicerae. These appendages have the row of teeth and 



