Vol. XXl] ENTOMOLOGICAL NEWS. 317 



69. Pamphila sabuleti var. tecumseh Grinnell. 



This small species occurs rather abundantly in grassy places 

 in the Canadian Zone. Found from June to August. Mr. Grin- 

 nell tells me my specimens are "perfectly typical." 



70. Pyrgus tessellata Scudd. 



A very common species below 8,500 feet, June to August. 

 Larvae on Sidalcea spicata Greene. 



71. Pyrgus caespitalis Bdv. 



Not so common; Canadian Zone, June and July. 



72. Nisoniades persius Scudd. 

 Not rare, from June to August. 



73. Nisoniades propertius Lint. 



Mr. Williams took this species at Glen Alpine. I have one 

 specimen, July 28, Deer Park (6,200 feet). 



74. Nisoniades tristis Bdv. 



Mr. Grinnell has several specimens from Fallen Leaf Lake, 

 June 25-27. 



75. Eudamus mexicana H. S. 



Rather common in the Canadian Zone, late June to August. 



Dates of Koch's Genera as Published in Die 



Pflanzenlause. 

 BY O. W. OESTLUND, University of Minnesota. 



There appears to be a lack of uniformity among writers on 

 aphids in assigning dates to the genera established by Koch 

 in his monographic work, issued in parts extending over the 

 years 1854-1857. While some use the first or last date alone 

 for all genera, others use both combined. Hunter, in his list 

 of the Aphididae of North America, published as Bulletin 60 

 of the Iowa Experiment Station in 1901, gives the dates 1855- 

 1857 for the whole work and assigns Heften 1-4, pp. 1-134 to 

 1855; Heften 5-7, pp. 135-236 to 1857. On what facts this is 

 based is not clear. The citation may be from Hagen with the 

 omission of the earlier date (1854), and of parts 8 and 9, and 

 with the misplacement of the dates 1855 and 1857 in connec- 



