— no — 



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 epiphj-sis 

 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 Pallachira biviitata Mr. Grote evidently had a specimen with 

 partly extended legs for he remarks that the fore legs seem aborted. 



In Bleptina caradritialis (fig. 8) we find the extreme of a somewhat 

 dilTerent type of structure. The coxa is moderate in lengtii, a mere shell; 

 the femur is very long and is a flat plate with the edges slightly bent over 

 at sides, "i'he tibia is short, stout, with a moderate epiphysis 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 rernaining 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 uf the 

 pencil of hair or of the abnormal length of the tarsal joint. 



In Renia (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 Torticodes (fig. 10) there is a still further reduction in the modi- 

 fication, and no brush of hair. 



Finally in Epizeuxis (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. Mtiller and others consider them scent organs, and this explana- 

 tion is the only one that has any appearance of reason. In Hepialus 

 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 



