142 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Lemonia taraxaci, Esp. 
Closely like the preceding in all respects, but the additional wart 
on the thorax is very small, and there is another secondary wart 
posterior to and in line with iii on the abdomen. 
Family Lymantriidae. 
The range in variation is not great, though, as it takes the direction 
of reduction of some of the warts, the ultimate structure approaches 
the type of some of the families of the Arctiid series. Fortunately 
for diagnostic purposes, a dorsal ever^ible gland, osmaterium or 
“ retractile tubercle ” on the seventh abdominal segment is remark- 
ably persistent 1 (Packard, Journ, 1ST. Y. ent. soc., vol. 3, p. 124 ; see 
also Poulton’s original account, Trans, ent. soc. Lond., 1886, p. 159, 
and 1887, p. 299-301). Secondary hairs are only very rarely 
present and then poorly developed and curiously modified. 
Arctornis L-nigrum, Mull. 
Warts normal, but iv unusually high up, well developed ; v closely 
approximated to vi (a very unusual character). On thorax the 
three warts above stigmatal wart are distinct, equal, in line trans¬ 
versely. Hair bunched from the warts, but no tufts or plumes. 
Retractile tubercles rudimentary. 
Lymantria dispar, Linn. 
As above, but wart i very small; iv united to iii forming a single 
wart, vi small, close to v. On thorax the upper wart is rudimentary, 
there being only a single small seta. Retractile tubercles well devel¬ 
oped with small additional ones in the region of joints 5 to 8. Still 
no tufts or plumes. Stilpnotia salicis and Ocneria detrita have the 
same characters, but in the latter the rudiment of the upper thoracic 
wart is scarcely discernible and there are no glands on joints 5 to 8. 
Dasychira rossii, Curt. 
Larvae from the summit of Mt. Washington, N. H. Wart iv 
small,behind the spiracle, not approximate to iii, v and vi remote; 
three distinct warts on thorax above stigmatal wart. The dorsal 
hairs on joints 5 to 12 are tufted in brush-like bunches. Retractile 
tubercles distinct, but obscured by the hair. 
1 1 notice that in Notolophus antiqua these glands have a slender eversible Y-shaped 
appendage at the apex, directed forward when everted. Also in Stilpnotia salicis there 
are a pair of slender, finger-shaped black glands behind tubercle i on joints 5 and 6. 
