THE CANADIAN ENTOMOLOGIST. 309 



small transverse plate, quite distinct, however, from the anal plate, instead 

 of being united with it as in Cerussata. On the 8th abdominal segment 

 tubercles I and II are practically round and quite distinct, forming a 

 square, while in Cerussata they are greatly enlarged and practically united 

 into a conspicuous quadrate patch. In Cerussata also Mr. Bird has 

 pointed out that tubercle IV on the yth abdominal segment is raised a 

 little above the line of the spiracles, a feature which he says holds with 

 all that are strictly root borers, but does not hold in Tha/ictri, in which it 

 is placed below the line of spiracles. 



Pupa: Length, 17-23 mm.; diam., 4-6 mm.; dark chestnut brown, 

 but brighter and smoother than in Cerussata, cremaster with two short 

 curved diverging spines. 



I have already mentioned that in 1903 Mr. D. Brainerd secured 

 specimens in which the white spots were entirely wanting, the spots being 

 brown, of a deeper shade than the rest of the wing. This form was also 

 reared in the same year at Ottawa by Mr. C. H. Young, and last year 

 out of eight specimens reared by me two were of this form, which bears 

 the same relation to the typical form as Nitela, Gn., does to JVehris, Gn., 

 except that there are fewer of them in proportion. As this variety is so 

 well marked, and as there do not appear to be any intergrades, it is well 

 worthy of a name, and I therefore propose for it the name of Var. Perob- 

 soleta, which was kindly suggested to me by Dr. Dyar. The dates of 

 emergence of my si)ecimens ranged from 9th to 26th Sept., the two 

 extreme dates being the dates of emergence of the two specimens of Var- 

 Perobsoleta. The moths emerged at different times, but two whose time 

 of emergence was carefully noted emerged between 11 and 12 p.m. 

 Seventeen specimens (7 $, 10 9 ) of the typical form and 5 specimens 

 ( I c^ . 4 ? ) t)f^ tl^e variety are before me. 



Of Thalictri, Types No. 1-8 are in my collection ; Type No. 9 has 

 been deposited in the National Museum at Washington under No. 8468, 

 the gift of Mr. D. Brainerd; Types ic-12 are in the collection of the 

 Entomological Society of Ontario, at London, Ont., the gift of Mr. Youngj 

 Types 13 and 14 are in Mr. Young's collection ; and Nos. 15, 16 and 

 17 are in the collections respectively of Messrs. Brainerd, Winn and 

 Norris. Of Var. Perobsoleta, Types i and 2 are in my collection ; Type 

 3 has been deposited in the National Museum at Washington under No. 

 8469, also the gift of Mr, D. Brainerd : Type 4 is in Mr. Brainerd's 

 collection, and Type 5 in that of Mr. C. H. Young. 



