114 MODERN CLASSIFICATION OF INSECTS. 
Lophyrus bears but little relation to Hylotoma or Cladius, near which 
it has been ordinarily arranged. 
The genera Cephus and Xyela, and probably also Blasticotoma, 
appear to be respectively types of separate subfamilies. Xyela, in the 
size of its wings, approaches nearest to Lyda. Perga has a long and 
strongly serrated saw, whilst that of Pterygophorus is more like that 
of Lophyrus. 

The second family, Uroceripm* Leach (Siricidee Curtis), cor- 
responding with the Linnean genus Sirex+, is distinguished from 
the preceding insects by the structure of the ovipositor or borer, 
the irregularity in the trophi, the entire labium, the existence of a 
single spur on the fore tibize, and the elongated prothorax and collar, 
The body is of an elongated parallel and nearly cylindric form, the 
males being more depressed (fig. 72. 8. Urocerus juvencus ¢ ). The 
head (fig. 72.9. front of head of ditto) is rounded, and about as broad 
as the thorax ; the eyes somewhat kidney-shaped ; the antennee filiform 
or setaceous, vibratile, and composed of from 10 to 25 joints.t The 

* Brietiocr. REFER. TO THE SIRICIDA. 
Klug. Monographia Siricum Germanie. 4to. Berlin, 1803. 
Foggo. Note of an Insect of the Genus Urocerus, in Edinburgh Journal of Science, 
vol. ii. 1825. 
Guérin, in Mag. Zool. 1833. Ins. No. 68. (Urocerus Lefebvre, ) 
Latreille. | Mémoire sur un Nouy. Genre d’Insectes (Orusse) présenté a 1’ Institut 
National le 28 Floréal, An 4. — Ditto, in Eneyel. Méth., tom. viii. p. 56]. 
(Oryssus, new sp. ) 
Westwood, in Zool. Journ., vol. vy. p. 440. (Oryssus Sayii. ) 
Newman, in Ent. Mag. No.4. p.415. (Urocerus — Sirex.) — Ditto, in ditto, 
No, 25. p. 486. (Oryssus, new sp. ) 
Shuckard, in Mag. Nat. Hist., New Series, vol. i. p. 630. (U. duplex.) 

+ The genus Urocerus was established by Geoffroy in 1762, four years previous 
to the publication of the twelfth edition of the Systema Natura, in which Sirex was 
proposed by Linnaeus, who incorrectly referred to Geoftroy’s Urocerus under the 
name of Uroceros. Stephens adopts the family name Uroceride from Leach, but 
follows Linneus and Fabricius in using the name Sirex. The French authors pro- 
perly retain that of their countryman Geoffroy. 
¢ In the genus Urocerus, the number of joints in the antennz differ in the differ- 
ent species. In Urocerus gigas 9 the antenna are 24-jointed, the two terminal 
