A REVISION OF THE DELTOID MOTHS SMITH 7 



The fciiiui' t<Mi(ls r<> itii increase* of size and \vei,i;!ic m n\i<' ^idu). oi 

 s})eeies and in tlie opposite direction in others, its <l(H"rease usnally 

 eorrcspondiiii;- to an increased length ol trochanter. Sonietunes there 

 is an enlarjieinent toward tlu' apex, and (piite usnally tlie member is i 

 mere sliell, adai>ted to aecoiomodate and conceal a i^encd of hair or a 

 mass ol' specialized scales. Occasionally there will be found on the 

 iind(M' si(h' an area of si)ecialize(l pits somewhat ])rotuberant or raised 

 above the surronndinji- level, fbrmin.i>-, apparently, an extremely sensi- 

 tive surface. 



The tibial moditications are yet moie radical. The member itself is 

 shortened, sometimes so iiuich as to make it a mere rudiment 5 but it 

 always is of snflicn'iit size to bear a relatively larjie epiphysis, and an 

 altogether disproportionate ai)pendage wdiich seems a continuation of 

 the outer wall and extends to the tip of the tirst tarsal joint if it does 

 uot include the entire tarsus. This ai>[)eiidag'e is sometimes (juite 

 slender, sometimes enormously expanded and shield like, and usually 

 covers a mass of specialized scales and, very fretiuently also, tufts or 

 pencils of hair. It is often clothed with stiff hair outwardly, and when 

 cut or crushed is found to have the inner surface a mass of specialized 

 sensory pits. The epiphysis is always preseut and relatively large. 

 Ill many cases the covering is furnished at the edges with curved hook- 

 lets, which are closely set and fit into corresponding fove;e on the tibia. 



The tarsi are variously modified. In all cases the tirst joint is enor 

 inously elongated, often equaling the femur, and it is also much thick 

 eiied. This thickening is more apparent than real, however, for in 

 most cases the outer edge of the joint is so deeply excavated that it is 

 a mere shell. Occasionally there will be found near the tip a ladle 

 shaped appendage, attached by the handle, the bowl directed toward 

 base, and the edges of this bowl furnished with booklets. This seems 

 to be applied to some i)oint in the tibial process; but exactly what i)ur- 

 pose it serves I have not been able to ascertain. The other tarsal joints 

 are normal as a rule; but not iufreijuently they are much shortened 

 and i)artially aborted, the terminal aiticle sometimes bulbous and with 

 hugely developed claws. So greatly elongated are the legs as a whole 

 that when turned back they extend far behind the anal angle of the 

 secondaries and almost as far as the tips of the jiosterior legs. 



Specialized appendages in the form of scales and tufts or pencils of 

 hair have been mentioned and merit close study. The coxa is usually 

 hollowed out on its anterior face, and in the cavitj^ are inserted long, 

 yellow or bhudcish hair like scales, those near the base longest, gradu- 

 ally decreasing in length, so the entire mass may lie fully extended 

 when at rest. When the leg is extended this mass of hair may be 

 expanded somewhat fan-like. When at rest the femur covers this coxal 

 excavation and both conceals and ])rotects the tutting, now neatly 

 folded away. At first sight this and similar jicncils api)ear to c(uisist 

 of tine silky hair: but under the microscope it is found that there are 



