71 
The larvae are long, cylindrical grubs, with the segments distinctly 
marked; the head is small and horny; the last abdominal segment 
is large and armed at the end with a horny point. They have but 
six legs, the true or thoracic legs, which are very small; the ab¬ 
dominal pro-legs are replaced by fleshy protuberances. They reside 
in the interior of trees, which they perforate in various directions, 
often doing much injury. When about to enter the pupa state 
they make their cocoons of silk, interwoven with their borings. 
Urocerus albicornis, Fabr. 
4 The larva is thick, cylindrical and divided into thirteen segments 
including the head. The last segment is rounded, larger than the 
others, and ends in a conical horn-like point. The head is small, 
shining and horny. 
It forms a winding burrow in the wood of the pine. 
The perfect female is black, one inch long, with transparent 
smoky wings; a white spot behind each eye and another on each 
side of the abdomen which ends in a lance-shaped point, below 
which is the ovipositor. 
The male has a spot behind each eye, and a rust-colored abdo¬ 
men. 
Urocerus abdominalis, Harris. 
This species is very similar to the above, and burrows in the 
white pine. 
Dr. Fitch entertained suspicions of its being the male of U. albi¬ 
cornis. 
Tremex columba, Linn. 
Yellowish white, cylindrical, with the last segment rounded and 
terminated by a conical horn-like projection. Length, about one 
and one-half inches. 
It burrows in the wood of the elm, oak, sycamore, apple and 
pear. 
The body of the perfect female is cylindrical, about as thick as a 
common lead pencil, and an inch and a half or more in length, 
exclusive of the borer; head and thorax rust-colored, varied with 
black; abdomen black, with seven ocher-yellow bands across the 
back. 
Xiphidra albicornis, Harris. 
The larva probably bores in the trunks of soft-wooded trees. 
Xiphidra mellipes, Harris. 
This is probably a variety of the above X. albicornis. 
Oryssus h^emorrhoidalis, Harris. 
Oryssus manurus, Harris. 
Oryssus affinis, Harris. 
The larvae of these three species have not been studied, but they 
probably live in willow trees, boring in the trunks. 
