120 
These species are not separated very clearly and the last two should 
perhaps be combined 
Euura. 
E. orbitalis, Norton. 6 males, 12 females. April, May. 
These insects have been frequently bred from the galls on the 
stems of willows, and also from galls of C. strobiloides. Specimens vary 
considerably in size and coloration, but the differences do not seem to 
be great, or constant, enough to allow of separation, although following 
the descriptions they might be divided into almost as many species as 
have been erected by Walsh and Norton. 
Nematus. 
N. concolor, Norton. 2 females. April 23rd. 
N. labtadoris, Norton. 1 female. 
N. malacus, Norton. 2 females. May 8th and 18th 
N. extensicornis, Norton. 8 males. May 1 6th, June 5th. 
N. monela, Norton? 1 female. June 6th, (from Mr. Guignard.) 
N. subalbatus, Norton? 9 females. May 28th, June 5th. 
N. corniger, Norton. 16 males, 15 females. May 17th, August 8th. 
N. pallicornis, Norton. 13 males, 19 females. May 9th, June 13th. 
N. ventralis, Say. 2 males, 7 females. May 24th, July 1st. 
N. Saskatchewan, Norton. 2 females. May 28th, June 6th. 
N. militaris, Cress. 1 female. 
N. latifasciatus, Cress. 1 male. 1 female. July 7th, Alder. 
N. erythroijaster, Norton. 1 males, 7 females. June 5th, August Sth. 
N. Erichsonii, Hartig. 1 male, 11 females. May 19th, June 23rd. 
This imported species has devasted the larch forests of the 
Maritime Provinces and Quebec, and in Ontario has been also so 
abundant as to annually defoliate this tree. Its increase seems, how- 
ever, to have been slightly checked, and during the past season the trees 
suffered less, apparently. 
N. pallidiventris, Fallen? 2 males, 5 females. August 26th. 
This is apparently an imported species, and has been found infesting 
ornamental willows on the Central Experimental Farm. The females 
were ovipositing on the date given. It differs in some respects from 
pallidiventris as described by Cameron, and may be a distinct species. 
