HYMENOPTERA. 215 
The two species known are found in Europe, on the trees 
only, in the spring. They are very active *. 
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 mandibles 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 tail or horn, and the ovipositor is 
salient and formed of three filaments. 
These Insects, which are tolerably large, more particularly inhabit 
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 ter- 
minates in a point. It lives in wood, where it spins a cocoon, and 
completes its metamophosis. 
S. gigas, L., the female—S. mariscus,, L., the male; Rees., 
Insect., If, Vesp., viii, ix. The female is above an inch in length, 
and black, with a spot behind each eye; the second ring of the 
abdomen and the three last, yellow. The abdomen of tne female 
is fulvous-yellowish with a black extremity. 
The Tremex 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 +. 
FAMILY II. 
PUPIVORA. 
In the second family of the Hymenoptera we find the abdomen at- 
tached to the thorax by a simple portion of its transversal diameter, 
and even most frequently by a very small thread or pedicle, in sucha 
manner that its insertion is very distinct, and that it moves on that 
part of the body t. The females are provided with an ovipositor. 
The larvee are destitute of feet, and mostly parasitical and carni- 
vorous. 
I divide this fantily into six tribes. 
In the first, that of the Evaniaues, Lat., the wings are veined, and 
the superior ones, at least, are lobate; the antenne filiform or setace- 
* See Lat., Gen. Crust. et Insect., III, p. 245, and Encye. Méthod., article 
Orysse. 
+ See Lat., Ibid., III, p. 238; the Monograph of this genus by Kliig; the work 
of Jurine and that of Panzer on the Hymenoptera. 
{ The first segment of the abdomen forms the posterior extremity of the thorax, 
and unites intimately with the metathorax, so that the second segment of the abdo- 
men becomes the first. 
