l8o SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 125 



lateral margin of thorax, slightly behind the humeral angles; com- 

 posed of 1 6 filaments which branch into groups as follows: 7-2-2- 

 3-1-1. Maximum length of filaments, 1.6 mm., about 0.3 times as 

 long as cocoon ; average diameter, 40 ju, ; filaments ending in points, 

 with microscopic spicules. 



Cocoon (pi. 39, fig. 334) : Length of base, 3.6 mm. ; greatest length, 

 5.4 mm.; greatest width, 2.1 mm.; greatest height, 2.1 mm. Cocoon 

 slipper-shaped, with distinct collar and fine parchmentlike texture, 

 threads not visible ; lateral margins not extended to form "wings." No 

 festoons or prolongations from rim of anterior aperture. Cocoon 

 covering abdomen only. 



Larva (pi. 40, fig. 372, and pi. 42, fig. 409). — Total length, 8.8- 

 9.6 mm. Length of head capsule 1.2 times its width. Thoracic and 

 abdominal segments 1-4 only slightly wider than head; segments 5-7 

 expanded, the greatest width being reached at segment 7 which is 1.5 

 times as wide as segments 1-4 ; there seems to be a progressive widen- 

 ing from the anterior to posterior ends ; in profile, the dorsum is 

 straight while on the ventral surface there is a gradual slope down- 

 ward from the fourth to seventh segment and then an abrupt upward 

 trend toward the posterior sucker. General color yellow, with no 

 dark bands on ventrolateral regions of abdominal segments 6 and 7. 



Head: Yellow, the designs on the frons-clypeus and epicranial 

 plates (pi. 40, fig. 372) dark reddish brown; design on frons-clypeus 

 in form of shield ; epicranial plates somewhat darkened, with 3 exten- 

 sive clear areas near posterior border and 3-4 other small ones dis- 

 tributed mainly on the posterior half. Each cephalic fan with 36-40 

 pectinate branches ; the minute hairs on these branches are simple, 

 short, close together, with longer, heavier hairs at regular intervals. 

 Mandible with only i rather long, narrow tooth on its inner border 

 near apex. Antenna 400 /a long, yellow to light brown ; 4-segmented, 

 surpassing the basal stalk of the cephalic brushes ; segment i equal in 

 length to segment 3 ; segment 2, i .8 times the length of either i or 

 3 ; segment 2 with 2 clear regions which divide it superficially into 5 

 color bands. Submentum with 9 triangular-shaped apical teeth which 

 are small and almost of equal size ; ventrolateral row composed of 8 

 hairs in a straight line, all being bifid but the basal two which are 

 simple ; lateral margin of submentum with 5 teeth in regular sequence. 

 Occipital cleft shaped somewhat like a dome with its apex pointed 

 (pi. 42, fig. 409) . 



Thorax and Abdomen: Pseudopod (thoracic proleg) with 45-48 

 rows of hooks at its apex ; postclypeal sclerites small, well sclerotized, 

 and separated, situated near posterior junction of the frons-clypeus 



