242 CLASSIFICATION OF INSECTS. 



wood of fir-trees, making channels, as in the two preceding 

 orders. Pupa changes in the same situations. Imago with 

 antennas twelve -join ted, the basal and second joints short, 

 the third very long, and the nine following very short, to- 

 gether scarcely equalling the third in length, elbowed twice 

 at each end of the long joint ; mandibles moderately long, 

 acute, and dentate internally ; maxilla with the blade 

 small, obtuse, the galea biarticulate, the feelers very long 

 and four-jointed; Idbium short, ligula hitherto undiscovered, 

 feelers four-jointed ; ocelli three ; wings very ample ; legs 

 short; prothorax not developed superiorly, the mesothorax 

 and head meeting above it ; podeon as wide as the other 

 segments ; oviduct ensiform, exserted, enclosed between 

 two appendages. Inhabits fir-trees, occasionally settling 

 on umbelliferous plants. Xyela. 



Oryssiies. Larva and pupa unknown. Imago with an- 

 tenna eleven -jointed in the male, ten-jointed in the female, 

 short, rather incrassated exteriorly, the joints of various 

 proportions and forms ; mandibles dilated, rounded, pu- 

 bescent ; maxilla with the blade obtuse, rounded ; the 

 galea rather elongate, narrow, and truncate at the apex ; 

 feelers long, pubescent, and five-jointed ; labium short, 

 with the ligula small, rounded, and entire, and the feelers 

 rather short and three-jointed ; ocelli three; fore and hind 

 wings moderately large, with numerous nervures ; legs 

 short ; prothorax with very little development superiorly ; 

 podeon as wide as the other segments ; ovipositor spirally 

 convoluted beneath the body. Inhabits fir and horn-beam 

 trees. Oryssus. 



Common* saw-flies or Allantites. Larva cylindrical, of 

 uniform substance, with six articulated and twelve or four- 

 teen membranaceous feet. Inhabits vegetables, feeding 

 upon their leaves in the manner of larva of Lepidoptcra. 

 Pupa sometimes changes in a cocoon, fixed in a curled 



