134 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



transverse row, crossing the segment about three- fourths the distance 

 from the anterior margin, the row divided in two by a median space ; 

 anterior to the outermost spine on either extremity are 2 hairs, the 

 most anterior one somewhat heavier ; segments 3 and 4 each with a 

 transverse row of 8 simple spines, crossing the segment somewhat 

 before the posterior margin, the row divided in two by a median 

 space; segment 6 with 24 spines in transverse row that crosses about 

 one-fourth the distance from the anterior margin, with median separa- 

 tion, and with comblike groups of minute spines lateral to both ends of 

 the row; segment 7 with a row of 18 spines, with median separation, 

 crossing along anterior margin, and with combs lateral to each end 

 of the row ; segment 8 with 30 spines in an uninterrupted row across 

 the anterior margin, and with combs lateral to the both ends ; segment 

 9 with 15-18 spines in transverse row, with median space, crossing 

 along the anterior margin, without combs. Ventral surface of ab- 

 dominal segments : No granulosity ; all spines anteriorly directed ; 

 segment 4 with a single bifid spine on either side of midline, near 

 middle of segment, with median space ; segment 5 with transverse row 

 of 4 bifid spines, with median separation ; segment 6 with 4 spines in 

 transverse row, the outer spines simple, the inner bifid ; segment 7 

 with 4 spines in transverse row, the outer spines simple, the inner 

 spines trifid ; the transverse rows on segments 5-7 cross the segment 

 along the posterior margin ; the two spines on either side of the mid- 

 line of segments 6 and 7 are more separated than those on segment 5, 

 the distance between them being approximately equal to that of the 

 median space. Terminal spines very small, the apices blunt. 



Respiratory apparatus (pi. 36, fig. 285) of each side arising in the 

 region of the humeral angles, just behind the anterior margin of the 

 thorax ; composed of 8 filaments which branch as follows : 3-3-2 ; 

 all filaments have superficial annulations and microscopic spicules. 

 Maximum length, 2.6 mm., about 0.74 times the length of cocoon; 

 average diameter, 20 /*. 



Cocoon (pi. 39, fig. 325): Length of base, 3.5 mm.; maximum 

 width, 2.2 mm.; maximum height, 1.4 mm. Cocoon of wall-pocket 

 type, without collar ; lateral margins of base extended to form wing- 

 like structures ; rim around anterior aperture not thickened, with slight 

 anteriorly directed prolongation from dorsal margin ; texture of case 

 parchmentlike, in the matrix of which loose threads are visible. Cocoon 

 covering abdomen and half of thorax ; attached along the posterior 

 half of its base. 



Larva (pi. 40, fig. 364, and pi. 42, fig. 401).— Total length, 4.4-4.8 

 mm. Length of head capsule 1.2 times its width. Width of thorax 



