122 MODERN CLASSIFICATION OF iNSECTS. 
posed of eleven* regular joints in the males ( fig. 73. 8.), but consist 
of ten very irregular joints in the female ( fig. ’73. 9.). The anterior 
tibia in the males (fig. 73.10.) are simple, but dilated and incised 
in the females ( fig. 73. 11.) ; in both sexes they are terminated by a 
single spur: the anterior tarsi are 5-jointed in the males, but only 
3-jointed in the females. 
The construction of the thorax is represented in jig. 73. 6, 7., in 
which the prothorax and its collar are dotted, the mesothorax not 
lettered, and the metathoracic parts marked with letters — z being its 
preescutum, and s its scutellum; a are the cenchri, and y the epime- 
ron; the femora of the anterior, middle and posterior legs are cut off at 
the base ; and the dotted part 7, in fig. 7., represents the basal segment 
of the abdomen. This part of the body is not pointed at the top in the 
females, as in the Urocerus and Xiphydria. The ovipositor is long 
and very slender, and has been described as spiral in its form; but 
this is incorrect, being strongly curved only at its base. It ordinarily 
rests in a channel at the under side of the extremity of the body, but 
is capable of being partially (as in fig. 73. 4.) or entirely exserted (as 
in Klug’s Monogr. Siric., tab. 1. fig. 3.). The composition of the terebra 
(fig. 73. 5. its extremity, copied from Hartig) is similar to that of Uroce- 
rus, although far more delicate; c representing the canal, and ec the two 
spicule of the terebra. Dahlbom has separated this anomalous genus 
from the Uroceride, and formed it into a distinct tribe, Oryssini, 
chiefly on account of the structure of the ovipositor, the paucity of 
veins in the wings, and the insertion of the antenne beneath the 
clypeus, close to the mouth. He also conjectures that its larva is 
gallivorous. 
These insects are extremely agile, running about the stumps of 
trees with great velocity in the sunshine. Latreille and Klug suppose 
that the larvee subsist upon the wood of standing trees. Scopoli found 
them upon fir trees, and Latreille upon old hornbeams. 

The second division of the Terebrant Hymenoptera comprises a 
very extensive tribe of insects, for which the name of ENTOMOPHAGA 
may be retained, on account of the habits of the majority of the spe- 
cies, the larvee of which are parasitic upon or within the bodies of 
* Fabricius and Hartig incorrectly describe the male antenne as 12-jointed ; and 
the latter also describes the female antenne as 11-jointed, regarding the minute in- 
sertion as a distinct joint. 
