79 
The Horned Span-Worm. 
(.Nematocampa filament aria, Guen.) 
Order Lepidoptera. Family Phal^nid^e. 
This very curious measuring worm may be easily distinguished 
m any other species by the occurrence upon the back of two 
equal pairs of long fleshy filaments, situated on the third and 
h abdominal rings, the posterior pair shorter than the others, and 
:h pairs curled at the ends. 
it is among the minor enemies of the strawberry, not being con¬ 
ed to this plant, and occurring, as far as reported, only in trivial 
mbers. 
:[t was first observed, by Harris, in Massachusetts, in 1841, but his 
bes, description and figure, were not published until 1869, in his 
tomological Correspondence. In the meantime, the species had 
m described and figured by Guenee, in 1857,* under the name by 
ich it is now known. 
't was probably first mentioned as a strawberry insect in Packard’s 
ide to the Study of Insects, published in 1869. Hr. Harris found it 
ding upon the oak, willow and rose; and it has since been noticed 
m the pear, currant, maple, hazel, hickory and raspberry. 
Che following descriptions are from Hr. Packard’s Monograph of 
! Phalsenidse: 
Larva— Body cylindrical, head large, with two unequal pairs of 
g, slender, fleshy filaments, situated on the third and fifth abdo- 
aal rings, the posterior pair shorter than the others, curled at the 
l and finely tuberculated. Head pale rust-red, marbled with a 
1 paler hue. Head full on each side of the median line, flattened 
front. Half-way between the metatlioracic legs and the first pair 
filaments, are two subacute tubercles, which are rust-red; when 
four filaments are uncurled, they are as long as from the head 
the tubercles. The anterior pair of filaments are pale rust-red 
leath at base, brown above, but tipped with white. A distinct 
sal line from the prothorax to the second pair of filaments; a 
r of small tubercles next to the last segment, tipped with pale 
t-red. Body wood-colored above and beneath; thoracic rings 
enish above, succeeded by rust-red between the tubercles and first 
r of filaments; behind these, variously marked with light and 
k-brown. An oval dark spot behind the last pair of tubercles 
l extending into the anal plate. Anal legs rusty, lined above 
h a whitish line. Length, 0.70 inch. It feeds on the strawberry 
l currant in June. 
y u,pa .—Body rather thick, conical, pale horn-brown, slashed and 
| ckled with dark-brown. The pupa appeared in Salem, June 17. 
lgth, 0.40 inch. 
mago .—The moth is of a pale-ochre color, with brown veins and 
isverse stripes, a brown inner line much curved. An outer sin- 
e line, with a supplementary line just inside, touching the outer 
M on the submedian vein and in the extradiscal space, and form- 
a large circle, one side of which touches the outer line. Beyond 
Uranides et Phalenites, tome I, p. 121. 
