ANTENNA OF LEPIDOPTERA. 31 



vided oil the ventral surface with sense-liairs of tlic tliird type. An 

 indication of tlie generalized condition of the antenna i.s the cover- 

 ing of scales over the whole dorsal surface of both the shaft and the 

 pectinations. The base is covered with long, narrow scales, forming 

 a prominent tuft on the dorsal aspect. On the shaft the scales are 

 little more than flattened hairs. Indeed, for some distance from" the 

 insertion-cups they are cylindrical in form, and they are very narrow 

 throughout their length. They are relatively long and stand out 

 obli<iuely from the surface. These scales are broader and more spe- 

 cialized than some on the wings and other parts of the body, but 

 they show the form characteristic of the family, narrow and lightly 

 pigmented. There is a very small number of both ])its and cones, 

 and they are located on the pectinations. The pits are very rudi- 

 mentary in structure, and, excepting in the possession of a short rod, 

 depart but slightly from the first ty|)e of sense-hair. Where the 

 cones appear at all, they have migrated to the extreme distal ends 

 of the pectinations and pi'oject from the ends in the midst of the 

 more or less crowded growth of scales. 



The P.sYCiiiD.K. — The females of all the Psychidie remain in their 

 larval sacs even in the adult state, and they have become wingless. 

 The males, however, fly, and are compelled to seek the females in their 

 cases before pairing can take place. As might be expected from 

 such conditions, we find the antennse quite highly developed in cer- 

 tain directions ; yet as a whole they are of a very generalized type. 

 As in the Megaloi)ygidiTe, nearly the whole surface of the scape and 

 pedicel is covered with long, narrow, hair-like scales, and all of the 

 clavola excepting the ventral aspect is clothed with scales of but 

 little higher type. The greatest development is reached in the pecti- 

 nations. Relatively, they are the longest found among the Loi)idop- 

 tera. In P.^yeht' confederata some of those near the middle of the 

 clavola attain a length equal to one-half that of the whole antenna. 

 The bases of the pectinations have migrated proximad and occupy 

 a central position on the segments. Hairs of the third type are 

 numerous on the ventral surface of both shaft and pectinations. 

 They are well developed, but have no regular arrangement in their 

 insertion. Pits are rare, and are limited in the forms I have studied 

 to the two or three distal pairs of pectinations. Cones also are rare, 

 and when present are situated at the ends of the pectinations. The 

 antenna) of Thcridopteryx ephemenvjormis present a peculiarity in 

 the joint between the scape and the i)edicel. The latter segment is 



TEANS. AM. ENT. SOC. XXIII. FEBEUAKY. 1896. 



