THE CANADIAN ENTOMOLOGIST. 7o 



CANADIAN HYMENOPTERA, NO. 7. 



BY W. HAGUE HARRINGTON, F. R. S. C., OTTAWA. 



The object of this paper is chiefly to record some observations, 

 made last summer, on a few parasitic forms, but mention is first made of 

 two phytophagous species. 



StRONGYLOGASTER ? MARGINATA, PrOV. 



Selaiidria margmafa, Prov., Add. Faun. Hym., 1885, p. 8. 

 Eriocampa fnarginata, Prov.,Cresson, Cat.N. Am. Hym., 1887, p. 162. 

 Strongylogaster primitivus, MacG., Can. Ent., 1893, Vol. XXV., 

 p. 241. 



Tenthredopsis primitivus, MacG., Can. Ent., 1894, Vol. XXVI., 



P- 327- 



Mr. MacGillivray has recently kindly sent to me one of his types of 



primitives for comparison with that of Provancher's marginata, and I 

 find, as was already evident from the description, that it is the same 

 species. The generic position of the species is, however, not so readily 

 determined ; Mr. MacGillivray being now of opinion that it belongs 

 neither to Tenthredopsis, Strongylogaster or Taxonus, but probably to 

 some yet undescribed genus. It certainly does not belong to Tenth- 

 redopsis as adopted by Cameron in his monograph of the British 

 Phytophaga, nor to Selandria, so that I have left it for the present in 

 Strongylogaster, to some of our accepted species of which it is very 

 similar in appearance. Several of the groups of our Tenthredinidae 

 require revision, the classification of species solely from wing venation 

 being unsatisfactory, for in the phytophagous hymenoptera the venation 

 is much more unstable than in the other divisions of the order. I fear, 

 for instance, that Mr. MacGillivray's genus Bivena (Can. Ent., Vol. 

 XXVI., p. 327) has been founded upon the accidental occurrence of a 

 supplementary marginal cell. 

 Cephus PYGMiEUS, Linn. 



The continued spread of this wheat-stem sawfly is evidenced by the 

 occurrence of two males in a small collection made on 5th July, at Indian 

 Head, Assa., by Mr. Fletcher, during his trip to British Columbia last 

 summer. 

 Pezomachus Pettitii, Cresson, Can. Ent., 1892, Vol. IV., p. 61. ? . 

 Pezomachus sulcatus, Prov., Add. Faun. Hym., 1885, P- 77- ?• 

 Stibeutes Pettitii, Cr., Riley and How., Ins. Life, 1890, Vol. III., 

 P- 154- 



