16U FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
purple and only a lit tit- orange below the stigmata. There is also a faint yellowish 
donal line. The eleventh legmen! has purple-brown subdorsal lines with orange on 
the back. These lines unite on the twelfth segment and form a broad dorsal line. 
Peel and legs purple. (French.) 
M<> ft. — Fore wings olive-ash, a distinct, dark (dive subdorsal spaee ; median space 
paler, olivaceous ; transverse anterior line black, geminate, dentate; the space in- 
cluded is stained in the middle with brown. A narrow, distinct, discal lunate streak, 
preceded by b blackish zigzag median shade line most distinct in the costa. Be- 
yond the discal streak the wing is clear and whitish, forming an oblique pyriform 
space, limited out wardly by the subtenninal line and below by a dark shade below the 
third median vein, somewhat as n: //. oliliqua. It is closely related to //. einerea Pack. 
The following notes by Professor Riley throw more light ou the habits 
of this insect : 
Found July 9, 1884, at Hyattsville, M<1., quite a number of larvas of a Notodouta 
feeding on oak, hickory, walnut, birch, aud Carpinns americana. 
Larv;e entered the ground July 11) aud 20, and the moths issued from July 27 to 
August 7. (Unpublished notes.) 
218. The oak forked tail. 
Seterocampa marthesia (Cram.) (Lochmceus tessella Pack.). 
The caterpillar of this moth is one of the most iuterestiug among the 
Notodontiaus since it connects Cerura with the other genera, by reason 
of its two long caudal filaments, so much like those of Cerura. These 
appendages are simply modified anal legs, and seem to be tactile aud 
repellant organs. This caterpillar is also interesting from its power 
when touched of forcing out a dense cloud of fiue spray from a gland 
in the under side of the prothoracic segment, near the head. It is very 
common ou the oak, both red and white, from Maine southward, in 
August and through September, aud occurs as far south as Georgia. 
The young before the last molt have much higher prothoracic dorsal 
tubercles and much longer anal filaments than in the adult, and they 
are tinged with reddish. The cocoon is of silk, not very thick, spun 
between the leaves, and in confinement the moths issued iu November, 
though ordinarily not due until June. 
Professor Riley has observed it on the oak at St. Louis, Mo., June 22, 
and iu July. He sends the following notes : 
The larva, if disturbed, thrusts from the anal appendages a fiue red thread. The 
moths issued March 11 and Id. 
Many of the larva are iufected by parasites, among which were a Tachinid and a 
Cryptus. (Unpublished notes.) 
Larva. — It is a large-bodied, pale green caterpillar, thickest iu the middle, being 
somewhat spindle-shaped. The head is moderately large, tiat in front, subcorneal, 
with the vertex high aud conical, pale green, edged very irregularly with roseate on 
the sides. A small double reddish tubercle on the top of the prothoracic segment, 
from which a median white or yellow dorsal stripe, here and there marked with ro- 
seate spots, runs to the supra-anal plate. The aual legs are represented by two 
slender filaments held outstretched, which are nearly as long as the body is thick. 
There are seven pairs of oblique lateral faint yellowish slender stripes, the last pair 
extending to the sides of the anal filaments. All the legs are pale green and concol- 
orons with the body. Length 40 mm , including the filaments. 
Moth. — This species is rather above the medium size, and may be known by being 
nearer in form of antenna), body, and wings to Cerura than any other species of Loch- 
