HYMENOPTERA. 215 



The two species known are found in Europe, on the trees 

 only, in the spring. They are very active *. 



SiEEx, Lin. — Urockrus, Geoff., 



Or Sirex proper, where the antennae 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 uf tall 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 nusnbers 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. 



5. gigas, L., the female — 5. mariscus,, L., the male ; Roes., 



Insect., II, 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 Avith a black extremity. 



The Tremex of Jurine only differs from Sirex in the antennae, 



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 such a 

 manner that its insertion is very distinct, and that it moves on that 

 part of the body +. The females are provided with an ovipositor. 



The larvae are destitute of feet, and mostly parasitical and carni- 

 vorous. 



I divide this family into six tribes. 



In the first, that of the Evaniales, Lat., the wings are veined, and 

 the superior ones, at least, are lobate ; the antennae filiform or setace- 



* See Lat., Gen. Crust, et Insect., Ill, p. 245, and Eucyc. Method., article 

 Orysse. 



t See Lat., Ibid., Ill, p. 238 ; the Monograph of this genus by Kliig ; the work 

 of Jurine and that of Panzer on the Hymenoptera. 



X 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. 



