224 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



midline of segments 6 and 7 are farther apart than those on segment 5, 

 the distance between them about equal to that of median space. Ter- 

 minal spines small, the tips rounded. 



Respiratory apparatus (pi. 37, fig. 304) arising somewhat behind 

 the anterior margin of thorax; composed of 6 very long filaments 

 which branch close to the base, and at the same level, as follows : 

 2-2-2 ; filaments with microscopic spicules and with poorly marked 

 superficial annulations. Maximum length, 4.8 mm.; about 1.3 times 

 the length of cocoon ; average diameter, 32 fi. 



Cocoon (pi. 39, fig. 344) : Length of base, 3.8 mm. ; width, includ- 

 ing winglike expansions, 4.0 mm. ; maximum height, i.o mm. Cocoon 

 of wall-pocket type, without collar ; lateral margins with winglike 

 expansions that give the cocoon a circular appearance when viewed 

 from above ; these expansions vary with the substratum and may be 

 completely absent when the pupation occurs on restricting surfaces; 

 the expansions are always present on cocoons formed on leaf surfaces, 

 the usual substratum used by this species ; texture of case spongy, soft, 

 the threads loose and easily visible ; rim around anterior aperture not 

 thickened. Cocoon covers the abdomen and thorax; attached along 

 the posterior three-fourths of its base. 



Larva (pi. 41, fig. 382, and pi. 43, fig. 419). — Total length, 5.3- 

 5.5 mm. Length of head capsule i.i times its width. Width of thorax 

 almost twice that of head. First 4 abdominal segments equal to width 

 of head ; segments 5-7 greatly expanded, greatest at segment 6 which 

 is twice the width of segment i ; greatly reduced after segment 7 ; in 

 dorsal view the larva has the appearance of a dumbbell ; abdomen 

 almost round in cross section. General color milky gray, with pinkish 

 hue on posterior abdominal segments; with large, black, granular 

 patches on ventrolateral regions of segments 6 and 7. 



Head: Designs on frons-clypeus and epicranial plates shown on 

 plate 41, figure 382. Each cephalic fan with 34-40 pectinate branches, 

 the hairs on these branches long, slender, simple, not very close to- 

 gether, without intermixture of other kinds of hairs. Mandible with 

 2 sharp-pointed teeth on its inner margin, the more-distal one longer 

 and broader, the more-basal one appearing to emerge from the same 

 base. Antenna 450 ju, long, 4-segmented, first segment dark brown, 

 the others light brown, segments i and 2 alone surpassing the 

 basal stalk of cephalic fan ; segment i with longitudinal wrinkles ; seg- 

 ment 2 with transverse striations. Submentum with 9 triangular- 

 shaped teeth, the central tooth and outermost tooth on either side 

 larger than the others ; ventrolateral row composed of 4 to 5 hairs in 

 straight line, usually simple ; lateral margin of submentum with 4 to 6 



