— 109 — 



Zanclogna/ha (fig. 4, IcEvigata) marks another advance on this type 

 of structure. The coxa as to form and tufting is much as before, but 

 stouter. The femur still convex below, concave above, is dilated about 

 one-third from base, wiiile the apex is thick, obtusely rounded. A heavy 

 pencil of long hair, making a beautiful fan when fully expanded, is in- 

 serted in the concavity, near the tip. Somewhat within the tip beneath, 

 are inserted the modifications of the tibia. The epiphysis is here only 

 united at the extreme base with the tibial process, which assumes a 

 shield-like form, widest before the middle and narrowing to a rounded- 

 tip. The first tarsal joint is now also involved in the modification, and 

 is hoUovv^ed out beneath theprotecting tibial process. Its point of in- 

 sertion becomes merged at the base with the insertion of tibia. In ac- 

 cord A'ith the modification of the first tarsal joint, the other joints begin 

 to shorten, until they do not equal in their combined length the length 

 of the fir.>t joint. 



Pityolila pedipilalis (fig. 5) while essentially similar to the preceding 

 marks a further advance ox change in structure. At the point on the 

 femur indicated by a dilation in Z. Icevigata, we find here a pitted surface, 

 surrounded and beset by long scale-like hair somewhat enlarged at tip. 

 The tuftings are more dense, the hair and scales of the tibial process 

 longer, while the tarsal joints from 2 to 5 become still shorter. 



With Philometra longilabris (fig. 6) we enter into the bizarre, but 

 still on the same line of modification. The coxa is much reduced in 

 size, a mere shell, and not tufted. The femur is long, slender, also a 

 mere shell convex above, reverting thus to the Megachyta type, and en- 

 tirely without tuftings. Attached to these frail supports, is a most extra- 

 ordinary development of tibia and tarsus. There is here a distinct tibia 

 with an enormous epiphysis at base, exceeding in size the shank of the 

 tibia. To this shank however is attached a huge process, still retaining 

 the general form indicated in previous genera, but exaggerated in each 

 dimension. This process is furnished with a pencil of hair on the upper 

 side near its base, and is densely clothed with long hair and scales. 

 From the interior of this development issues the first tarsal joint, fully as 

 long and much stouter than the femur, and excavated in front where it 

 is protected by the tibial process. To this exaggerated first joint are 

 added four small additional joints, as a whole not equal to one-fourth 

 the length of the first joint. 



Liiognatha nubilifascia {^%. 7). caps the climax of development in 

 this line, and presents a re-arrangement of parts, scarcely indicated, even 

 in Philometra. The coxa is stout, and of moderate length, the apical 

 half excavated in front and furnished with a tuft of rather short hair. 

 The femur is long and slender, apparently a complete shank and not a 



