THE CANADIAN ENTOMOLOGIST 101 



LIBELLULIN^. 



17-139 Libellida quadrimaculata Linne. 



Tenerals appeared June 8, 1 d^. On June 11 I saw three 

 and took a 9 ; June 15, took 2 cfs and a 9 ; June 17, numbers fly- 

 ing; June 18, reeds at Gaetz Lake full of tenerals with exuviae; 

 June 25, many on the wing; July 5, 2 cfs; July 9, "none;" July 13.. 

 "none;" July 15, 1 d^ ; July 16, 9 (ovipositing); July 23, a few- 

 ovipositing; July 29, 2; Aug. 5, a worn 9 ; Aug. 6, several very 

 worn 9 s. 



It will be noted that while C. shiirtleffi and L. quadrimaculata 

 appear at the same time, the season of the latter is two months, to 

 one month of the former. I once observed a 9 ovipositing with a 

 mate hovering by. Twice they went into copula for short periods 

 between spells of ov'ipositing — -which, however, she performed 

 alone. New to Alberta list. 

 18-160 Sympetrum corruptiini Hagen. 



A strangely rare insect considering the length of its season, 

 as shown by the dates of the only five specimens taken in this dis- 

 trict in two years, viz., June 20, 1916, Sylvan Lake (Horsbrugh), 

 a d^ nearly adult; July 8, 1916, Red Deer, a cf ; Aug. 5, 1916, Red 

 Deer, a 9 ; mid-Aug., 1915, at Blackfalds, a 9 ; Sept. 4, 1915, Red 

 Deer, a 9 teneral. 



Assuming that June 20th specimens had been on the wing 

 since June 15, and the Sept. 4 teneral would have lived until Sept. 

 15, it would give a season of three months. Four of my captives 

 were taken on roads, and the fifth on a railway grade. 

 19-161 Sympetrum costiferum Hagen. 



Aug. 5, a 9 ; Aug. 6, a 9 ; Aug. 13, many flying alone and in 

 cop.; Aug. 29 to Sept. 24, "numbers," and fresh tenerals. Last 

 date Sept. 30. 



Costiferum is probiibly rather less numerous than either S. 

 rubicundulum or 6'. scoticum, but very common nevertheless It 

 is the last of the genus to appear, but I fancy it may have been on 

 the wing slightly earlier than my first date. New to Alberta list. 

 20-162 Sympetrum obtrusum Hagen. 



Dr. Walker named one of my 1915 captives obtrusum, and it 

 possibly occurs here in fair numbers. I must confess, however, 

 that I find difficulty in satisfying myself positively by the genital 



