MAPLE BORERS. 381 



The following descriptiou of the larva is copied from our report " On 

 the Insects affecting the Cranberry, with remarks on other injurious 



Insects."* 



The larva.— A long, white, cylindrical worm, with the segment behind the heacl 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 horny 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 eqnal 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, 

 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 ^^ ^'^®' 

 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 laryje 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. Clementi 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. 



Xiphidria albicornis Harris. 



Order Hymenoptera; family Urocerid^. 



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, 1878. 



