Zanclognatha (fig. 4, devigata) 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, while 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 hollowed out beneath the protecting tibial process. Its point of in- 
sertion becomes merged:at the base with the insertion of tibia. In ac- 
cord with 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 first joint. 
Pityolita pedipilalis (fig. 5) while essentially similar to the preceding 
marks a further advance or change in structure. At the point on the 
femur indicated by a dilation in Z, /evigata, 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 Megachyfa 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. 
Litognatha nulilifascia (fig. 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 
