92 INSECTA. 
\ 
palpi long and formed of five joints; the posterior extremity of the 
abdomen is almost rounded or but slightly prolonged, and the ovi- 
positor capillary and spirally convoluted in the interior of the ab- 
domen. 
The two species known are found in Europe, on the trees 
only, inthe spring. They are very active(1). 
. Sirex, Lin.—Urocerus, Geoff., 
Or Sirex proper, where the antenne are inserted near the front 
and consist of from thirteen to twenty-five joints. The man- 
dibles are dentated on the inner side, and the maxillary palpi very 
small, almost conical, and biarticulated. The extremity of the last 
segment of the abdomen is prolonged into a sort of tailor horn, and 
the ovipositor is salient and formed of three filaments. 
These Insects, which are tolerably large, more particularly inha- 
bit the Pine forests of cold and mountainous countries, produce in 
flying a humming like that of a Bombus, &c., and in certain seasons 
have appeared in such numbers as to strike the people with terror, 
The larva has six feet, and the posterior extremity of its body 
terminates in a point. It lives in wood, where it spins a cocoon, 
and completes its metamorphosis. 
S. gigas, L., the female—S. mariscus, L., the male; Rees., 
Insect., II, Vesp., viii, ix. The female is above an inch in 
length and black, with a spot behind each eyes; the second ring 
of the abdomen and the three last, yellow. The abdomen of the 
female is fulvous-yellowish with a black extremity. 
The Yremex of Jurine only differs from Sirex in the antenne, 
which are shorter, less slender at the end, or filiform only, consisting 
of thirteen or fourteen joints, and in the superior wings which have 
but two cubital cells(2). 
(1) See Lat., Gen. Crust. et Insect., II, p. 245, and Encyc. Méthod., article 
Orysse. ' 
(2) See Lat., Ibid., Ill, p. 238; the Monograph of this genus by Kliig; the 
work of Jurine and that of Panzer on the Hymenoptera. 
