486 ANNUAL REPORT SMITHSONIAN 'NSTITUTION, 1925 



were four lonfritiidinal rows of long curved hairs, one being sub- 

 dorsal and one lateral. Each row was composed of a single hair on 

 each segment from the fourth to the ninth, inclusive, t)ie subdorsal 

 series ending on the last. The first three segments had each a set 

 of three subdorsal hairs, those on the first segment curving forward. 

 The lateral series were likewise formed of one on each segment, all 

 directed laterally and surrounding the extremities of the larva. The 

 hairs have the bases of remarkable formation, resembling glass-like 

 pedestals Avith fluted sides. Tiie entire upper surface of the bod}^ 

 is densely studded with extremely minute p3'riform glassy processes. 

 The under surface is just as densely clothed with very short stoutish 

 hairs. The liead is ochreous. with dark brown markings in front. 

 The prolegs are duskj% and the claspers are unicolor on the under 

 surface. 



As described by Mr. Frohawk tlie honey gland of the larva after 

 the third molt is of peculiar construction, being formed of flexible 

 tissue and surrounded by numerous glassy white pyriform processes 

 varying in size, some of which are extremely minute. Those border- 

 ing the edges of the gland are furnished with excessively small white 

 bristles, each process bearing four or five arranged in the form of a 

 fan with diverging points; all are directed toward the central aper- 

 ture, the Avhole forming a fringe surrounding the gland, and are 

 obvioush^ for the purpose of holding the bead of liquid in place, 

 and probably also serA'e as a jDrotection for this apparently sensitive 

 organ. 



The fully grown larva is seven-twelfths of an inch in length. The 

 third molt is the last, after which every part, as determined from 

 a careful microscopical examination of all the structural details by 

 Mr. Frohawk, remains absolutely unchanged. This accounts for its 

 extremel}^ small head, Avhich is out of all proportion to the size of 

 the larva, but Avhich was of proportionate size directly after the 

 third molt when the length was only one-eighth of an inch. The 

 small black dorsal disk on the first segment now appears as a mere 

 black speck. The head is set on a very flexible retractile neck which 

 can be readily protruded beyond the first segment when the larva is 

 in motion, but when resting the head is completely hidden and with- 

 drawn into the ventral surface of the segment. 



In a dorsal view both anterior and posterior segments are rounded, 

 the body gradually increasing in width to the tenth segment. The 

 segmental divisions are deeply cut, each segment being latei-ally 

 convex. 



In a side view the first anterior and the last posterior segments are 

 somewhat flattened dorsally and projecting laterally. The second- 

 ninth segments are humped dorsally. The medio-dorsal furrow 



