MAPLE BORERS. 
381 
The following description of the larva is copied from our report u On 
the Insects affecting the Cranberry, with remarks on other injurious 
Insects."* 
The larva.— A long, white, cylindrical worm, with the segment behind the head of 
the same width as the twelfth segment from the head ; the thirteenth much nar- 
rower, regularly rounded behind, with a deep crease above, leading back- 
ward and a little downward to a small, sharp, terminal, dark-reddish 
horn. The horn is acute, with three teeth above, near the base, and two 
smaller ones on the under side. Each of the three last rings bulges out 
on the under side. The head is white, and about half as wide as the 
segment behind, into which it partially sinks. It is rounded, smooth, 
with the antennae represented by small rounded tubercles, ending in a mi- 
nute homy spine; should the spine be regarded as indicating a joint, 
then the appendage is three-jointed. The clypeus is broader than the 
labrum by a distance equal to its own length. The labrum is a little 
more than twice as broad as long, with the front edge slightly sinuous. 
The large, powerful mandibles are four-toothed on one side and three- 
toothed on the other. The maxillae are three-lobed, the lobes unequal, 
ending in spines, the middle lobe with two spines, the outer lobe much 
smaller than the others. The labium or under lip is rather large, rounded, ^ IG 141 __ 
with a spine projecting on each side. Theprothorax or segment next be- Larva of 
hind the head is twice as long as the one behind it, divided into two por- Tremex 
tions by a suture behind it. There are three pairs of small, soft, un- columba 
jointed feet, of which the first pair are considerably the largest ; they ^Froni 
do not project straight out, but are pressed to the body and directed Packard. 
backward. There are ten pairs of spiracles, one pair on the hinder edge 
of the prothorax, twice as large as the others ; the second pair between the second 
and third rings, and the eight others on the eight basal abdominal segments. 
Length, 2.25 inches ; greatest thickness, .28 inch. 
The larvse from which the above description was taken were found at 
Amherst, Mass., early in October, in a tree containing several of the 
adult insects, which had not left their holes and seemed likely to be 
destined to pass the winter in the tree, dementi has, in Ontario, Can- 
ada, taken several of the imago with the larvae from the oak in March, 
so that it undoubtedly hibernates as an imago. 
Mr. W. H. Harrington states (Can. Ent., xiv, 225) that on the 9th 
of October, 1880, he found one ovipositing in an old beech, which had 
for some time been much infested by these borers. He also, October 
10, visited some old maples which are a favorite resort of these insects, 
and captured upon one of them a female in the act of ovipositing, while 
upon the same tree were the bodies of three or four which had evidently 
very recently perished in the performance of such act. 
3. The white-horned xiphidria. 
XvpMdria albicornis Harris. 
Order Hymenoptera; family Urocerid^e. 
This fine saw-fly has been found by Mr. W. H. Harrington not only 
upon dead trees, but he has usually observed it upon living ones; not 
* In the Tenth Annual Report of the U. S. Geological and Geographical Survey of 
the Territories for 1876, p. 531. By F. V. Hayden, U. S. Geologist. Washington, 1873. 
