1893.] LbJ [Packard. 



Fig. 7 represents the armature of the three tlioracic segments. Pp, the 

 prothoracic shiekl ; I, II, II[, the bifid dorsal spines of tiie three thoracic 

 segments, about three-fourths or four-fifths as U)ng as the segments are 

 thick ; sd', sd", sd'", the bifid subdorsal spines ; s', s", s'", the spiracu- 

 lar spines ; the prothoracic ones throw off a bristle near the middle ; in 

 those behind this bristle is wanting ; they are inserted just in fruut of the 

 spiracle, tlie corresponding ones, however, on the abdominal segments 

 being situated just below the spiracles ; i', i", i'", the small infraspirac- 

 ular spines which are about half as long as the spiracular ones ; V, V, 

 I'", insertion of the thoracic legs. 



Fi^. 8 represents the armature of some of the other segments. A, the 

 third thoracic and the first and second abdominal ; III, I', II", the dorsal 

 spines ; and the other lettering as before ; sp, the spiracle ; g, the lateral 

 eversible gland of the first abdominal segment. B, the sixth to tenth 

 (and last) abdominal segments ; faint traces of the spiracvilar and iulra- 

 spiracular yellowish lines are to be seen, hence the medio-dorsal, the 

 subdorsal, and the two lateral longitudinal lines of the larva in its second 

 stage are already indicated in the first stage. The abdominal legs each 

 bear eight ungues, or four on each side ; and all except the anal legs bear 

 a piliferous wart just above the planta ; sp, the rugose suranal plate, bear- 

 ing five piliferous warts on each side ; Ip, the lateral plate of the anal 

 legs, with three or four piliferous warts. 



Stage II. — Length, 7 mm.; width of head, 1.3 mm. The head is chest- 

 nut-brown. The body is uniformly reddish amber-brown ; the spines are 

 blackish brown, with the spines black at the tip. The dorsal and subdor- 

 sal spines are now approximate in shape to those of the last stage, being 

 bulbous at base, and with radiating stout spimiles, but the latter are less in 

 number than in the fft h and sixth stages. The dorsal spines of the pro- 

 thoracic segments are bifid, the forks of the same length, and each bearing 

 a long hair ; along the trunk are pale scattered tubercles, each ending in a 

 long hair. The second thoracic dorsal spines have but one terminal pilifer- 

 ous spinule and a single lateral one, the other spinules ending in a sharp 

 black point. The third thoracic is like all the abdominal dorsal spines 

 which bear radiating spinules, not ending in a single piliferous spinule, 

 as in Fig. 9, vi. 



Fig 9, sd'", represents a spine of the subdorsal series, the one figured 

 being that on one side of the third thoracic segment, but those on 

 the abdominal segments (except x) are like it, though most of the ab- 

 dominal ones have two or three small tubercles near the base which bear 

 barbed bristles, as at sdvi. All the long setoe bear a few minute barbs. 



In Stage IV {1), when the larva is 20 mm. in length, the prothoracic 

 dorsal spines are nearly twice as long as the second thoracic ; the latter, 

 however, have more spines at the base than those in front, and the lateral 

 terminal are a little shorter than those on the first thoracic segment. The 

 two dorsal spines on the third thoracic segment are, in size and spinula- 

 tion, now exactly like those on the abdominal segments 1-9. The 



