126 GENUS XIPHYDEIA. 



Tenthredo; the borer attached to the lateral plate at 

 the top, and the spicules to the triangular plate. 



In the sub-imago state the lateral sheath is, as in 

 the imago, pressed close to the side of the abdomen, 

 the sheath being free ; the lateral plate on the outer 

 side is grooved ; the sheath is not ; and its apex is bent 

 so as to form a sort of hook. As in the imago the 

 " borer " has its two pieces united, the upper part 

 being grooved. It lies between the lateral plate and 

 the sheath, and has the two spicules immediately over 

 it. These are grooved throughout, and at the top one 

 side goes more in the direction of the lateral plate 

 than the other. At this stage they are shorter than 

 the borer, which extends to the apex of the sheath. 



The apex of the sub-imago is a blunt stumpy point, 

 turned over on itself above. 



The family contains two sections : 



The Siricina with the pronotum transverse and perpendicular in 

 front, the palpi with 1 or 2 joints in the maxillary, and 3 in the labial ; 

 no sutures on the mesonotum, and the abdomen terminating in a spine ; 

 and the 



Xiphydrina with the pronotum emarginated in front and not perpen- 

 dicular, the prosternum greatly elongated, the maxillary palpi have 5, 

 and the labial 3 joints, and the abdomen does not end in a spine. 



Genus XIPHYDKIA. 



Xiphydria, Latr., Hist. Nat. Crust. Ins., iii, 304 (1802) ; Htg., 



Bla-ttw., 367. 



Hybonotus, Klug, Mon. Sir. Germ., 11. 

 Xiphiura, Fallen, N. Hym. Disp., 1813. 

 Xiphidion, Provancher, Nat. Canad., x, 233. 



Antennae 14 22-jointed, filiform. Wings with two radial and four 

 cubital cellules, the first cubital receiving the transverse basal nervure, 

 the second and third the recurrent nervures. Lanceolate cellule with 

 an oblique cross nervure. Posterior wings with two middle cellules. 

 Maxillary palpi 5-, labial 3-jointed, the labium entire. Posterior tibiae 

 with two spurs. Prosternum greatly elongated, incised in front. 

 Sutures on mesonotum distinct. 



The head is cubical, bordered behind, vertex and 

 front without sutures. Eyes oval, placed well in 



