98 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



and the type of abietis and it seems that they represent only one 

 species. In the male the yellow varies from continuous inner 

 orbital line to superorbital spots.' 



EXPLANATION OF PLATES. 



Plate XI. Oryssus occidentalis Cress. Drawn by Miss Eleanor Arm- 

 strong. 



Fig. 1. Larva, dorsal view. Fig. 2. Same, lateral view. Fig. 3. Same, 

 ventral view. Fig. 4. Female pupa, dorsal view. Fig. 5. Male pupa, dorsal 

 view. Fig. 6. Male pupa, lateral view. Fig. 7. Female pupa, lateral view. 



Plate XII. Oryssus occidentalis Cress. Drawn by R. A. Cushman. 



Fig. 1. Larva, facial view of head; a, antennae; Ib, labrum; Im, labium; 

 md, mandible; mx, maxilla; cr, chitinized ridges for articulation of man- 

 dibles. Fig. 2. Larva, mandible; a, internal view; b, ventral view. Fig. 

 3. Abdomen of female from side. Fig. 4. Detail of ovipositor and apical 

 segments from side. Fig. 5. Detail of ovipositor, dorso-lateral view; 

 T = tergite; S = sternite; It == lancet; I -= lance; sh sheath; o = ovi- 

 positor; c = cerci. 



In discussion Mr. Baker thought the elevation of the Oryssidae 

 into a suborder would necessitate other changes in the classifica- 

 tion of the Hymenoptera. He pointed out the generally under- 

 stood position of the Oryssidae and its seeming relation with the 

 Siricidae. He stated that in the separation of the scutellum, 

 the one tibial spur, the loss of the notauli, proepimeron, etc., 

 the two families show striking affinities as well as a resemblance 

 in the wings. The entirety of the median plate and the speciali- 

 zation of the head has been known even while placing the family 

 close to the Siricidae. Even the parasitic habit was indicated 

 years ago by Harrington. The remaining characters then, on 

 which the suborder is erected are, Mr. Baker thought, structures 

 in the early stages and modifications of the ovipositor due to 

 parasitic mode of life. He thought that Ashmead may have had 

 some notion of these structures when he suggested the family 

 as the possible ancestor of some of the parasitic forms. Mr. 

 Baker also pointed out that out of five genera, excluding Lithonjs- 

 sus, and numerous species, the immature stages of only one spe- 

 cies had been studied and adults of only one dissected. It is 

 possible he thought that others might show some differences and 

 at any rate he claimed that if the suborder were erected it would 



