56 Studies on Life-hiatory of Bomhycine Moths. 



and under a ^-inch objective the shell is seen to be coarsely, deeply 

 and irregularly pitted, the hexagonal shape of the edge of the pits 

 being nearly effaced. The larva often after hatching eats more or 

 less of the shell. 



Larva, stage I — Length 4 mm. Head black, two-thirds as wide 

 as the body. The prothoracic segment is as wide as the body 

 behind; it is black above in the middle; on each side is a large 

 reddish-ochreous tubercle directed obliquely outward and giving 

 rise to about twelve long, mostly blackish (a few gra}')- hairs, 

 which, like all the others, are finely spinulated. The other two 

 thoracic segments are pale flesh-colored with a whitish tint, with 

 a transver.se row of blackish-brown piliferous warts, of which the 

 two in the middle are much smaller than the one on each side. 

 Abdominal segments 1-4 dark varnish-brown, with large dark 

 piliierous warts ; segment 5th colored like the 2d and 3d thoracic, 

 being whitish-greenish pale carneous, with two minute but con- 

 spicuous piliferous warts. The three following segments with the 

 general color, tubercles, and hairs as on abdominal segments 1-4. 

 On segment 8 is a roundish dark dorsal patch enclosing two dorsal 

 blackish piliferous warts, the skin bordering the patch being reddish- 

 carneous. The lateral row of black hairs and those at each end are 

 about three-fourths as long as the body ; the longest hairs, a pair 

 on each segment, arise from the sides of the prothoracic and 8th 

 abdominal segments. The eversible glands in this stage are not 

 noticeable and are not seen unless attention is specially called to 

 them ; only the one on the 6th abdominal segment is to be distinctly 

 seen, that on the Tth segment is less apparent and not bright 

 colored. Duration of the stage 7 to 8 days. 



Larva, stage IL — Length 6-8 mm., varying somewhat in size. 

 Head black. The two lateral prothoracic tubercles are now very 

 large, pale coral-red on the basal two-thirds, black at the end, the 

 hairs arising from them are black. On the top between the tuber- 

 cles is a large black patch. The top of the 2d thoracic segment is 

 whitish, but the small dorsal tubercles, which are unequal in size, 

 are dark. The top of the 3d thoracic segment is pale, whitish, 

 bordered with ochreous, and bearing small pale piliferous warts. 

 Abdominal segments 1-4 are velvety black on the back, edged with 

 a narrow ochreous line, each segment bearing two large black pilif- 

 erous warts. The body is now a little humped over the 1st and 2d 

 abdominal segments. The 5th segment is yellowish-white above. 



