1952 1 Remington — Nearctic Lepidoptera 69 
intervening years of much less abundance. In the vicinity 
of St. Louis, Missouri, I never found larvae of V. cardui 
on anything but thistles except in the years of great influx, 
but then garden hollyhocks ( Althea rosea Cav.) were al- 
ways heavily infested. There is a very long list of re- 
corded foodplants for V. cardui in North America and 
Eurasia, but Artemisia seems to be previously unlisted. 
Careful tests of the whole range of recorded plants for 
their suitability to V. cardui for development would be 
valuable. 
16. Vanessa virginiensis (Drury). Several solitary lar- 
vae were found on 9 July 1949 in their familiar nests on 
Antennaria aprica Greene [S.F.B.] near Nederland, Colo. 
This is an uncommon butterfly in the mountains, and its 
larvae were found more easily than the adults. 
17. Polygonia satyrus (Edw.). On 25 July 1949 one 
full-grown and three half-grown larvae were found on 
streamside Urtica ( U . gracilis ?) clumps at an elevation of 
7200' in Boulder Canyon, Colo. These were interspersed 
with larvae of Vanessa atalanta and Nymphalis milberti 
(see above). One larva was allowed to complete develop- 
ment, and the imago emerged on 8 August 1949. From the 
fact that they are allopatric and from the appearance and 
foodplant of the larvae I suspect that P. comma and P. 
satyrus are actually conspecific; the pattern and color dif- 
ferences of the adults are slight enough. 
18. Limenitis weidemeyerii Edw. A female was seen 
laying several ova on the tips of leaves of Salix along a 
stream, at Eldora, Boulder Co., Colo., on 18 July 1949. 
One ovum laid on Salix drummondiana Barratt var. sub - 
caerulea (Piper) Ball [C.R.B.] was recovered; the larva 
emerged on 30 July and was preserved. 
References 
Berger, L. A. and M. Fontaine. 
1947-48. Une espece meconnue du genre Colias F. Lambillionea, 
47:91-98; 48:12-15, 21-24, 90-110, 1 pi. 
Eff, J. Donald. 
1950. Rocky Mountains — New Mexico, Utah, to Alberta, in The 
Field Season Summary of North American Lepidoptera for 1949. 
Lepidopterists’ News, 3:90-93. 
