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THE Hornep Span- Worm. 
(Nematocampa filamentaria, Guén.) 
Order Leprporrera. Family PHanmnipm. 
This very curlous measuring worm may be easily distinguished 
from any other species by the occurrence upon the back of two 
unequal pairs of long fleshy filaments, situated on the third and 
fifth abdominal rings, the posterior pair shorter than the others, and 
both pairs curled at the ends. 
It is among the minor enemies of the strawberry, not being con- 
fined to this plant, and occurring, as far as reported, only in trivial 
numbers. 
It was first observed, by Harris, in Massachusetts, in 1841, but his 
notes, description and figure, were not published until 1869, in his 
Entomological Correspondence. In the meantime, the species had 
been described and figured by Guénée, in 1857,* under the name by 
which it is now known. 
It was probably first mentioned as a strawberry insect in Packard’s 
Guide to the Study of Insects, published in 1869. Dr. Harris found it 
feeding upon the oak, willow and rose; and it has since been noticed 
upon the pear, currant, maple, hazel, hickory and raspberry. 
The following descriptions are from Dr. Packard’s Monograph of 
the Phalenide : 
“Larva.—Body cylindrical, head large, with two unequal pairs of 
long, slender, fleshy filaments, situated on the third and fifth abdo- 
minal rings, the posterior pair shorter than the others, curled at the 
end and finely tuberculated. Head pale rust-red, marbled with a 
still paler hue. Head full on each side of the median line, flattened 
in front. Half-way between the metathoracic legs and the first pair 
of filaments, are two subacute tubercles, which are rust-red; when 
the four filaments are uncurled, they are as long as from the head 
to the tubercles. ‘I'he anterior pair of filaments are pale rust-red 
beneath at base, brown above, bvt tipped with white. <A distinct 
dorsal line from the prothorax to the second pair of filaments; a 
pair of small tubercles next to the last segment, tipped with pale 
rust-red. Body wood-colored above and beneath; thoracic rings 
greenish above, succeeded by rust-red between the tubercles and first 
pair of filaments; behind these, variously marked with hght and 
dark-brown. An oval dark spot behind the last pair of tubercles 
and extending into the anal plate. Anal legs rusty, lined above 
with a whitish line. Length, 0.70 inch. It feeds on the strawberry 
and currant in June. 
Pupa.—Body rather thick, conical, pale horn-brown, slashed and 
speckled with dark-brown. The pupa appeared in Salem, June 17. 
Length, 0.40 inch. 
Imago.—The moth is of a pale-ochre color, with brown veins and 
transverse stripes, a brown inner line much curved. An outer sin- 
uate line, with a supplementary line just inside, touching the outer 
line on the submedian vein and in the extradiscal space, and form- 
ing a large circle, one side of which touches the outer line. Beyond 
*Uranides et Phalenites, tome I, p. 121. 
