PACKAED.I HORN-TAIL BORER. 531 



on the abdominal segments are smaller and otherwise diflPerent from 

 those in Bhagium. 



Pupa : The pupa is far advanced, being nearly ready to change to a 

 beetle, the body becoming dusky and horn-colored, while the character- 

 istic dark spots have already appeared on the wing-covers. The an- 

 tennae are coiled up three and a half times at the end between the fore 

 and middle pair of legs, and the genus may be recognized by their great 

 length, and the deep excavation in the head between them, as well as 

 by the lateral short spine on the prothorax. 



The wing-covers in my single specimen reach to the third abdominal 

 segment and are pressed obliquely to the side of the body. The salient 

 portions of the upper side of the abdominal rings with fine spines. End 

 of the body sinuate. 



In the absence of another pupa of this genus for comparison, addi- 

 tional characteristics cannot now be given. Length, three-quarters of 

 an inch. 



The Horn-tail Borer {Tremex Columba Linn.). — This insect in the 

 larva state was found by some students 

 in the Massachusetts Agricultural Col- 

 lege, at Amherst, Mass., early in Octo- 

 ber, in a tree on the college-grounds, no. 9_La,rva of Tremex Columba, natural 



With the larvae were associated several size. 



imagoes which had not left their holes, and seemed likely to be destined 

 to pass the winter in the tree. As the transformations of this insect 

 have not been known heretofore, we add the following description of 

 the larva. 



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 narrower, regularly rounded behind, with a deep crease 

 above, leading backwards and a little downward to a small sharp ter- 

 minal dark-reddish horn. The horn is acute, with three teeth above near 

 the base, and two smaller ones on the under side. Bach 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 tuber- 

 cles, ending in a minute 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 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 labrum or under lip is 

 rather large, rounded, with a spine projecting on each side. The pro- 

 thorax or segment next behind the head is twice as long as the one be- 

 hind it, divided into two portions by a suture behind it. There are three 

 pairs of small soft unjointed feet, of which the first pair are considerably 

 the largest ; they do not project straight out but are pressed to the body 

 and directed backward.. There are ten pairs of spiracles, one pair on 

 the hinder edge of prothorax, twice as large as the others ; the second 

 pair between the second and third rings, and the eight others on tha 

 eight basal abdominal segments. 



Length, 2.25 inches ; greatest thickness, .28 inch. 



