SPRUCE SPAN-WORMS. 841 
20. The spruce therina. 
Therina fervidaria Hiibner. 
This common insect feeds in Maine on the spruce, as the pupa was 
found early in August, and the moth was disclosed August 21. The 
larva was unfortunately not described. Abbot bred it in Georgia from 
the Ralesia diptera, and from his manuscript sketches, preserved in the 
library of the Boston Society of Natural History, we prepared the fol- 
lowing description. The pupa is described from our own specimen. 
Larva. — Body cylindrical, smooth ; head of the same width as the body, which is 
yellowish green above, pale purplish below. Two fine, blackish, lateral lines, with 
a pale line above. 
Pupa. — Rather slender, whitish gray, slashed and spotted with brown on the side, 
but much less so than in Th. seminudaria ; head, thorax, and wings nearly unspotted ; 
terminal spine and bristles as in Th. seminudaria. Length, 12 mm . 
Moth. — Pale ocherous, more so than usual, head and front of the thorax and 
antennae deep ocherous. Wings dusky, speckled with smoky spots (though varying 
in degree of irroration). Wings well angulated, the angle of ihe fore wings often 
acute, on the hind wings forming a slight tail. Outer line dark brown, bordered 
externally with ocherous. Inner line situated either on or a little within the inner third 
of the wing, a little curved. Discal dot dark, distinct, sometimes wanting on the 
hind wings. Outer line sinuate, or zigzag, varying greatly, the angle on the first 
median venule being slight or very marked on both wings; on the hind wings a 
single line only. Beneath, much paler ; the lines re-appear, but are diffuse and 
smoky. Legs, tibiae, and tarsi of the two pairs of fore legs brown, hind legs pale 
ocherous. Expanse of wings, .38 inch. 
21. Tephrosia cribrataria Guen. 
Order Lepidoptera ; family Phal.enid,e. 
The caterpillar of this geometrid moth occurred on the spruce at 
Brunswick, Me., June 5. The specimen was seut to the office of the 
Entomologist at Washington and there bred, while it is stated in the 
Department note-book that the pupa rested on the ground and was not 
attached to any leaves, etc., and the structure of the cremaster agrees 
with its subterranean habits. 
Larva. — Not described. 
Pupa. — Body rather thick and stout ; color light brown (but not so light as that of 
Caripeta divisata) ; surface coarsely pitted. Cremaster large, stout, and long, rough 
and tuberculated above at the base, and with no spines at the base or end, the point 
being long, smooth, and acute. 
22. The evergreen span-worm. 
Thera contractata Packard. 
Order Lepidoptera ; family Phal^nid^:. 
A very common caterpillar on various evergreen trees, such as the 
spruce, white pine, hackmatack, and the bush or common Juniper, is a 
little green caterpillar, striped with white, which is so assimilated in 
color to the glaucous green leaves with their whitish under side as to 
enable the caterpillar to escape ordinary observation. 
