428 INSECTS INJURIOUS TO VEGETATION. 



brilliancy of its color, and in having shorter antennce. The 

 borer of this and of the preceding species resembles, in form 

 and structm-e, that of the pigeon Tremex, and is used in the 

 same way. 



Urocerus abdominalis* the black and orange horn-tail, of 

 which only the male is known to me, has not been described 

 before. It is black, with the four middle segments of the 

 abdomen deep orange. There is a pale yellow spot behind 

 each eye; the front corners of the thorax are pale brownish 

 yellow; and there are two minute yellowish scales on the back 

 part of the thorax. The abdomen is flattened and widened 

 behind, and ends with a flattened or triangular point. The 

 antennae are long and tapering, of a reddish brown color, with 

 the two extremities black. The wings are transparent, with 

 brown veins, and are a little smoky at the tips. The first four 

 legs are ochre-yellow, with black thighs; and the hind legs are 

 black, with yellow knees and feet. This insect varies in length 

 from six tenths to more than three quarters of an inch. It is 

 found in July, on the trunks of the white pine. 



Mr. "Westwood has ascertained that the grubs of the insects 

 belonging to the genus Xipliydria have the same form and 

 habits as those of the horn-tailed wood-wasps. The name 

 comes from a word signifying a small sword, in allusion to the 

 borer of the female, which is shorter than in the preceding 

 horn-tails. The winged insects have a rounded head, distant 

 from the thorax, to the lower part of which it is joined by a 

 slender conical neck. The body is nearly cylindrical, a little 

 flattened, somewhat tm-ned up behind, and ends with an ob- 

 tuse point. The antennae are short, curved, and tapering at 

 the end. 



Xiphydria alhirornis of my " Catalogue," or the white-horned 

 Xiphydria, has white antennoe with the two lowest joints black. 

 The head is black, with a narrow white line around each of 

 the eyes, forming a large oval, interrupted only in two places, 



* So named from the great contrast in the colors of the abdomen. In my 

 " Catalogue" it stands under the genus Sirex of Linnajus, which is the same as 

 Urocerus of Geoffroy. 



