414 AuGUSTA Rucker, 



Texaii form, so far as knowii ^), and to give the variations occurring i 

 in wliat have been thouglit to be the fixed characters of the species. { 



1. One of the first and most interesting characters that has 

 hitherto been overlooked and which appears to be araong the oldest 

 phylogenetically and most permanent, since it appears in the j-onngest 

 and oldest stages, is the segmental arrangement of the fixed number 

 of setae on the cephalo-thoracic carapace. There are fiye rows of \ 

 these, the Ist consisting of a pair just back of, to tlie outside of, i 

 and almost on a line with the base of the median sensory hairs. ' 

 The second row, consisting of two pairs, is slightly arched and runs ; 

 over the head on a line with the origin of the second pair of appen- { 

 dages. The third row consists of the same number and is parallel ; 

 to the second row. The fourth row of three pairs of setae is 

 parallel to the other rows and appears on a line half way between 

 the third and fourth pairs of appendages. While the fifth row, 

 consisting of two pairs, is parallel to the others and half way be- > 

 tween the fourth and fifth pairs of appendages. 



In connection with these fixed hairs of K. ivheeleri it might be j 



well to mention a peculiarity of the anterior sensory Organs which i 

 seems to appear in no other species. This is a short bridge er 



Siamese-twin like connection between the two organs near their \ 



tip. Owing to the difficulty of seeing this connection except in most ^l 



favorable specimens which have been flattened dorso-ventrally through j 



cover-glass pressure, I cannot say of a certainity that such a con- . 



dition always exists, though I am certain that these organs rarely ^ 



eyer become separated in the region where this bridge was seen to j 



exist in other sensory organs. -) "^ 



2. Another fixed feature is the very large liollow pair of setae ^ 

 on the outside of the third metatarsal joints of the first pair of ; 

 legs. This hair has more the appearance of a large bifurcated seta ^ 

 with the rami glued together by a transparent jelly. The hair is j 

 flat and offen slightly curled, its walls are heavily chitinized and | 

 seem to be marked with peculiar pits and niinute hairs. This is i 



1) Shortly after this paper was sent to the publisher I received a 

 number of specimens of a uew species of a Kocncnla which was taken in 

 in Bonham, Texas. This species I have described in a paper, entitled A 

 new Koenenia from Texas , which is soon to appear in the Quarterly 

 Journal of Microscopical Science. 



2) Later examination of these organs in a glycerin preparation revealed 

 clearly one pair of these sensory organs which were not connected near the tip. 



