—l 10— 
mere shell, and not tufted in any way. To this is attached the tibia joint 
which is short and stout, dilated basally, the underside of the dilated 
portion modified into a rounded cushion or pad with a pitted surface set 
with short hair. The upper side is furnished with a tuft of long hair, 
spreading fan-like. To the end of this joint are attached the epiphysis 
and the shield-like process, similar in shape, but the latter very much 
the larger and densely clothed with long hair and scales. The tarsi are 
entirely wanting. When this unique structure is folded up and closely 
appressed to the thorax its peculiarities are entirely marked. In the con- 
generic Padllachira biwittata Mr. Grote evidently had a specimen with 
partly extended legs for he remarks that the fore legs seem aborted. 
In Bleptina caradrinalis (fig. 8) we find the extreme of a somewhat 
different type of structure. The coxa is moderate in length, a mere shell; 
the femur is very long and is a flat plate with the edges slightly bent over 
at sides. ‘The tibia is short, stout, with a moderate epzphysis and a very 
long process from the tip, gradually narrowing to a point. The first 
tarsal joint is very long, slightly exceeding in length the tibial process, 
and between the two, attached to the inner side of the process at base, 
is a pencil of hair reaching to its tip. The remaining tarsal joints are 
together rather more than half as long as the first. When the tibial pro- 
cess is appressed to the first tarsal joint, no trace is visible, either of the ~ 
pencil of hair or of the abnormal length of the tarsal joint. 
In Rena (fig. 9) there is a decrease of modification. The tibia is 
more normally proportioned, the process shorter, and the tuftings are 
reduced to a small brush at the base of the inner side. 
In Zorticodes (fig. 10) there is a still further reduction in the modi- 
fication, and no brush of hair. 
Finally in Zpizewxis (fig. 11) the leg structure is nearly normal, the 
femur being clavate, and excavated beneath so as to receive the tibia. 
In Palthis (fig. 12) the male palpus is peculiarly modified to ac- 
comodate a great tuft of hair—much greater than indicated in the figure 
—but this is given merely as an illustration of a different location for 
these tuftings. 
What is the purpose of these structures? That they have a purpose 
must be assumed, and as they occur in the male only they may be taken 
as matter of sexual importance, especially as they are accompanied by 
striking antennal modifications which I will describe at another opport- 
unity. Miller and others consider them scent organs, and this explana- 
tion is the only one that has any appearance of reason. In Hefialus 
hecta the cellular structure of the modified tibia has been examined, and 
large gland-like cells have been made out. In some of my preparations 
I am very certain a similar structure can be made out, but the mounted 
