HYMENOPTERA. 91 
Crpuus, Lat. Fab.—Tvachelus, Jur. 
Where the antenne are thickest near the end, and inserted near 
the front. According to certain observations published in the 
Bullet. Univers., of Baron Férussac, the larva of the most common 
species—pygmzeus—lives in the interior of the stems of the wheat(1). 
Xipuypria, Lat. Fab.—Urocerus, Jur. 
Where the antenne are inserted near the mouth, and more atte- 
nuated towards the extremity(2). 
The second tribe, that of the UrocreraTa, Lat., is distin- 
guished from the preceding one by the following characters : 
the mandibles are short and thick; the ligula is entire; the 
ovipositor of the females is sometimes very salient and com- 
posed of three threads, and sometimes capillary and spirally 
convoluted in the interior of the abdomen. 
This tribe is composed of the genus 
Srrex, Lin. 
The antennz are filiform or setaceous, vibratile, and formed by 
from ten to twenty-five joints. The head is rounded and almost globu- 
lar; the labrum very small; the maxillary palpi are filiform with from 
two to five joints, and the labials with three, the last of which is the 
thickest. The body is almost cylindrical. The anterior or poste- 
rior tarsi, and in several the colour of the abdomen, differ according 
to the sex. The female deposits her eggs in old trees, most com- 
monly in Pines. Her ovipositor is lodged at base between two 
valves, forming a groove. 
Oryssus, Lat. Fab. 
Where the antenne are inserted near the mouth and consist of ten 
or eleven joints. The mandibles are edentated, and the maxillary 
(1) See the work already quoted, and the Monog. of the genus Srrex of Kliig, 
G. Astatus. 
(2) Ibid., and Jurine. Kliig designates this genus by the name of Hybonotus. 
