ITU THE CANADIAN ENTOMOLOGIST. 



I assume that the insects collected on different plants are the same 

 species, because I am unable to find any tangible characters to separate 

 them ; but I give my notes on each lot separately : 



(i.) On Rudbeckia hirta, Aug. 4. Winged form dark reddish to 

 practically black ; nectaries black, cauda pale yellowish ; femora with 

 apical half black, basal half pale ; stigma pale greenish. Apterous form 

 shiny, 3 mm. long, not counting cauda. 



Winged % . — Cauda ensiform, with large lateral bristles ; length 

 about 500 /x. Nectaries about looo /j. long, black. Eyes black. An- 

 tennal joints in /x, (3.) 1070, (4.) 980, (5.) 850, (6a.) 200, (6b.) 1300. 

 Stigma tapering, marginal cell with poststigmatal part considerably longer 

 than subsiigmatal. Antennje black, joint 3 with prominent sensoria (at 

 least 40) along its whole length except extreme ends. Joint 4 without 

 sensoria. The other lots enumerated below showed the same micro- 

 scopical characters except some little difference in size, and a smaller 

 number of sensoria on joint 3 in the material from Potentilla and 

 Frasera. 



(2.) On heads of Helenmm hoopesii, July 26. Young and apterous 

 adults. The young are reddish, with greenish legs, and have a decided 

 bluish pruinose bloom. They are not tuberculate. The apterous adults 

 are shiny dark wine-red, with the legs as in N. rudbeckue; i.e., basal 

 two-thirds of fermora pale ochreous, apical third, and tibte and tarsi, 

 black or blackish. Nectaries long, black, obviously longer than in 

 rudbeckice. The bluish bloom is conspicuous even in subadults. On 

 Aug. 3 the species was found in great abundance, winged specimens 

 being present. The green species {N. Jicleniella) was present in smaller 

 numbers ; it cannot be a colour-variety of A^ Martini, owing to the 

 great difference in the sensoria on the third antennal joint. Measure- 

 ments in //: — Apterous ^: nectaries 1330; antennal joints, (2.) 120, (3.) 

 iioo, (4.) 900, (5.) 735, (6a.) 150, (6b.) 1030. Winged ?: nectaries 820; 

 antennal joints, (3.) 930, (4.) 790, (5.) 710, (6a.) 180, (6b.) 1090. 



(3.) On F?-asera speciosa, Auctt., abundant. Winged 9 : dark 

 wine-red; stigma yellowish; legs black, basal 73 of femora and coxie, 

 pale greenish ; nectaries black, yellow at extreme base ; cauda reddish. 

 Immature forms pruinose. Measurements in /a — Winged ? : nectaries 

 1000; antennal joints, (i.) 160, (2.) 100, (3.) 960, (4.) 810, (5.) 720, 

 (6a.) 170, (6b.) 1000. 



(4.) On flower -heads of Zygadenus Nuttallii, Coult. Flora, 

 abundant July 31. \Vinged 9: Head and thorax reddish-brown, 

 abdomen darker; nectaries black, pale at extreme base ; femora very pale 

 greenish, black at apex : young pruinose. 



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