214 INSECTA. 



their very long and equally flagelliform maxillary palpi. The thick 

 or callous point of the superior -wings is replaced by a cell. The 

 laminae of the ovipositor are smooth and entire. 



The larvae inhabit the interior of plants or old wood *. 



Cephus, Lat. Fab. — Trachelus, Jur., 



Where the antenn?e ai-e thickest near the end, and inserted near 

 the front. According to certain observations published in the Bullet. 

 Univers., of Baron Fenissac, the larva of the most common species 

 pygmcBus — lives in the interior of the stems of the wheat t. 



XiPHYDRiA, Lat. Fab. — Urocerus, Jur., 



Where the antennae are inserted near the mouth, and more atte- 

 nuated towards the extremity J. 



The second tribe, that of the Urocerata, Lat., is distinguished 

 from the preceding one by the following characters : the mandibles 

 are short and thick ; the ligula is entire ; the ovipositor of the fe- 

 males is sometimes very salient and composed of three threads, and 

 sometimes capillary and spirally convoluted in the interior of the ab- 

 domen. 



This tribe is composed of the genus 



SiREX, Lin. 



The antennae are filiform or setaceous, vibratile, and formed by from 

 four to twenty-five joints. The head is rounded and almost globular; 

 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 posterior 

 tarsi, and in several the colour of the abdomen, diflFer according to the 

 sex. The female deposits her eggs in old trees, most commonly in 

 Pines. Her ovipositor is lodged at base between two valves, form- 

 ing a groove. 



Oryssus, Lat. Fab. 



Where the antennae are inserted near the mouth, and consist of ten 

 or eleven joints. The mandibles are edentated, and the maxillary 

 palpi long and formed of five joints ; the posterior extremity of the 

 abdomen is almost rounded or but slightly prolonged, and the ovi- 

 positor capillary and spirally convoluted in the interior of the ab- 

 domen. 



* See Dalm., Anal. Entom., p. 27. The number of joints is the same as in the 

 preceding Insects, and in this respect that naturalist is mistaken. See also the Nouv. 

 Diet. d'Hist. Nat., 2d edit., article Finicole, and the Monograph of the Tenthredinitae 

 of M. Lepeletier. 



t See the work already quoted, and the Monog. of the genus Sirex of Kliig, 

 G. Astatus. 



X Ibid, and Jurine. Klug designates this genus by the name of Hybonotus. 



