408 
LEPIDOPTERA. 
The last of these insects is the ruhicunda (Fig. 201) of 
Fabricius, or rosy Dryocampa. This delicate and very rare 
moth is found in Massachusetts in July. Its fore Avings 
are rose-colored, crossed by 
a broad pale-yellow band ; 
the hind wings are pale yel¬ 
low, with a short rosy band 
behind the middle; the body 
is yellow ; the belly and 
leo:s are rose-colored. ' It 
expands rather more than one inch and three quarters. The 
caterpillar is unknown to me.* 
All the Moth caterpillars thus far described in this work 
live more or less exposed to vieAv, and devour the leaves of 
plants ; but there are others that are concealed from observa¬ 
tion in stems and roots, Avhich they pierce in various direc¬ 
tions, and devour only the wood and pith ; their habits, in 
this respect, being exactly like those of the Algerians among 
the Sphinges. These insects belong to a family of Bomby- 
ces, by some naturalists called Zeuzerad^, and by others 
Hepialidje, both names derived from insects included in the 
same group. The caterpillars of the Zeuzerians are Avhite 
or reddish white, soft and naked, or slightly downy, Avith 
broAvn horny heads, a spot on the top of the fore part of the 
body AAdiich is also broAvn and hard, and sixteen legs. They 
make imperfect cocoons, sometimes of silk, and sometimes 
of morsels of Avood or grains of earth fastened together by 
gummy silk. Their chrysalids, like those of the Cerato- 
* Only one more North American Dryocampa is known to me. This moth was 
taken in North Carolina, and does not appear to have been described. It may be 
called Dryocampa bicolor, the two-colored, or gray and red, Dryocampa. The 
upper side of the fore Avings and the under side of the hind Avings are broAvmish 
gray, sprinkled Avith black dots, and Avith a small round Avhite spot near the 
middle, and a narroAv oblique dusky band behind it on the fore Avings; the upper 
side of the hind Avings and the under side of the fore Avings, except the front edge 
and hinder margin of the latter, are crimson-red, and the body is broAvnish gray. 
The male expands two inches and a quarter. The female and the caterpillar of 
this insect I have not seen. 
Fig. 201. 
