730 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
lily then arc are openings left for that purpose 1 have not been successful in finding 
out how tin- matter is managed. The papa cell is covered at the outer extremity by 
a thin layer of rather brittle pitch: it may be a fact thai this is sometimes destroyed 
nlicii the temporarily exposed inhabitant is victimised. Had the parasite occupied 
the body of the host since the previous summer, it seems that the latter would have 
been too much exhausted to have completed its transformations. But why guess out 
the history of this parasite and its relations to the host? Now that its existence is 
known of, the facts of its history may be readily determined. 
Professor Riley remarked thai he had been very much interested in the paper. He 
could not recollect any instance when the larval life had been so long, and the ^Ege- 
ridsa as a rule are supposed to require only oik; year to undergo their transformations. 
As to the manner in which the Tachina reaches the ^Egeria larva*, it is probable that 
the latter must come to the surface rather often to expel the excrement from its bur- 
row and the Tachina could take advantage of that. Once fastened the egg is very 
secure. 
Professor Lintner asked whether the larva feeds on the pitch. Dr. Kellicott said 
that the excrement is mixed with pitch, but the larva makes regular burrows in the 
wood and undoubtedly feeds upon the wood. He said the larva is always more or 
less coated with pitch, and when removed from its burrow dies in a short time from 
the stiffening of this substance. He assumed that the larva must come out some- 
times for air, but did not see that there is any arrangement similar to that of Pcedisca 
scudderiana, which has a little trap-door arrangement which it can open at will. 
Larva. —When fully grown, 16 mm to 18 mm in length. The head is shining chestnut 
brown, the mandibles black. The body is livid or blackish green, naked, with a 
series of black dots, each dot giving rise to a single, rather stout bristle. The pro- 
thoracic shield is blackish. The larva has three pairs of thoracic or true-jointed 
feet, and four pairs of abdominal or false feet, besides anal claspers.* (Grote.) 
Chrysalis. — Cylindrical, smooth, narrow, blackish brown, about 16 mm in length. 
The head is pointed, there being a pronounced clypeal protuberance ; the segments 
are unarmed ; the anal plate is provided with a row of four spines, and two others, 
more slender, ou either side of the mesial line, below the first. (Grote.) 
Moth. — The wings expand 30 mm . Blackish-gray, shaded with reddish on the basal 
and terminal fields of the fore wings. There are patches or lines of raised scales on 
the basal tield and on the anterior and darker portion of the median space. The 
median lines are prominent, consisting of double black lines inclosing pale bands. 
The inner line at the basal third is perpendicular, W" 8rj aped or dentate. The outer 
line at the apical fourth is once more strongly indented below the costa. The blaek 
component lines do not seem to be more distinct ou one side than on the other of the 
pale included bands or spaces. The median field is blackish, becoming pale towards 
the outer line ; it shows a pale, sometimes whitish cellular spot, surmounted with 
raised scales. T'ae terminal edge of the wing is agaiu pale or ruddy before the ter- 
minal black line. Wings blackish. The hind wings are pale yellowish white, shaded 
with fuscous on tho costal region and more or less terminally before the blackish 
terminal black line ; fringe dusky. Beneath, the forewings are blackish, marked 
with pale on the costa ; hind wings as on the upper surface. Body blackish gray, 
with often a reddish cast on the thorax above and ou the vertex. The eyes are 
naked, the labial palpi long, ascending, with a moderate terminal joint. Tongue 
rather long. The gray abdomen is ringed with dirty white : the legs are dotted 
with pale. The species differs from the European abietella by the raised scale tufts 
on the wings, and Zeller declares it to be distinct from any European species. (Grote.) 
* Mr. Kellicott found that the larva hybernates, as April 12 he found the caterpillars 
of various sizes from .'25 to .7 inch in length. n Noue of those taken were ' livid or 
blackish green," but dull white; nor do the hairs arise from a 'series of black dots,' 
bnt from light-brown ones. I take it to be a case where a naked hybernating larva 
is lighter than during the warm summer. Otherwise the caterpillars were as de- 
scribed by Mr. Grote." 
