No. 416.] THE TEXAN K(ENENIA. 619 
Of the fifth segment nothing is said concerning K. mirabilis, 
while the figures show it to be like segment seven. This is 
decidedly not the case in our species. The fifth segment is — 
as far as the setze are concerned — a facsimile of the fourth. 
Again, concerning the sixth segment of the Sicilian species, 
the Danish investigators write, “It is furnished on its ventral 
side with a rather strongly protruding wart, bearing a somewhat 
arched transverse row of six forward-curving setae. We do not 
think these to be sensory organs either." In K. wheeleri the 
ventral surface of the sixth segment is in reality less prominent 
than that of the two preceding segments, for it is lacking in 
the first group of large hairs situated on the flaps on each side 
of the midventral line; the flaps, however, are retained. Fig. 1 
is a ventral view of the abdominal exoskeleton of a male 
Keenenia, which has been thoroughly cleaned of its cellular 
contents in KOH. In this specimen all six of the sacs are 
thrown out, and the protective function of the groups of four 
hairs is quite evident. All the setae shown in this figure are 
plumulose; but under a magnification of about 120 diameters 
they barely appear to be so, and I did not attempt to represent 
this condition in the drawing. 
It was only after repeated attempts that I succeeded in obtain- 
ing clear views of the reproductive appendages. In both sexes, 
segments two and three are con- 
spicuous for their relatively enormous 
appendages. In the female the mid- 
ventral surface of the second segment 
projects downward and backward into 
a triangular appendage, which is not 
emarginate at its apex, as in K. mira- 
bilis. This projection almost covers Ven o Bo caer wel — 
a couple of heavily chitinized down- sac in the center of Sern 
ward projections of the third segment. ei 
The receptaculum seminis opens between these two appendages, 
while the reproductive organs open further forward into the 
vagina formed by the three appendages. Fig. 2 shows what 
I take to be the receptaculum seminis, while the reproductive 
orifice only shows in section. The male appendages are very 
pi yu 
