410 
LEPIDOPTERA. 
The hop-vine Hcpiolus has not yet been detected in Mas- 
sachusetts ; but we have a much larger species, known to 
me only in the moth state, which is the reason of my hav- 
ing given the foregoing account of the preparatory stages 
of a European species. This moth does not appear to have 
been described. It is named in my Catalogue of the In- 
sects of Massachusetts, Hepiolus argenteo-maculatus (Fig. 
202), the silver-spotted Hepiolus. Its body and wings are 
Fig. 202. 
rather long. It is of an ashen-gray color ; the fore wings 
are variegated with dusky clouds and bands, and have a 
small triangular spot and a round dot of a silvery white color 
near their hasp; the hind wings arc tinged with ochre-yellow 
towards the tip. It expands two inches and three quarters. 
A much larger specimen was found by Professor Agassiz 
near Lake Superior.* 
The locust-tree, Robinia pseuclacacia, is preyed upon by 
three different kinds of wood-eaters or borers, whose un- 
checked ravages seem to threaten the entire destruction and 
extermination of this valuable tree within this part of the 
United States. One of these borers is a little reddish cater- 
pillar, whose operations are confined to the small branches 
and to very young trees, in the pith of which it lives ; and 
by its irritation it causes the twig to swell around the part 
attacked. These swellings being spongy, and also perforated 
* See a figure of it in his “ Lake Superior,” pi. 7, fig. 6. 
