1952] 
Remington — Near die Lepidoptera 
63 
lambertii Pursh. [R.C.R.] near Nederland, Boulder Co., 
Colo. The ovum was fertile. This appears to be another 
case of a mistake by an ovipositing female, but there was 
no opportunity to test the nutritional suitability of Oxy- 
tropis. The usual foods of Parnassius are Crassulaceae, 
Saxifragaceae, and Papaveraceae. One must question 
Wright’s records of Viola and V dccinium. Females of P. 
smintheus from Nederland laid numerous ova on a native 
Sedum in confinement, 11 July 1949. The larvae emerged 
in the laboratory 12-14 September 1949, although they 
would normally have overwintered in the egg stage. 
PlERIDIDAE 
3. Euchloe ausonides Bdv. During the summer of 1949 
larvae and ova were found almost everywhere they were 
sought in Boulder County at all elevations between 5600' 
and 9000'. At Nederland on 6 July several ova and a half- 
grown larva were taken on Arabis drummondi Gray and 
Arabis fendleri (Wats.) Greene var. spatifolia (Rydb.) 
Rollins and one small larva on Erysimum capitatum 
(Dough) Greene [all R.C.R.]. The next day, in Spring 
Gulch, several ova and young larvae and one half-grown 
larva were taken on Arabis glabra (L.) Bernh. [R.C.R.]. 
This Arabis has erect pods, and it was noted that Euchloe 
were absent entirely from a co-occurring and similarly 
common Arabis with decumbent pods ( spatifolia ? — not col- 
lected) and from Erysimum. At Mt. Flagstaff and 6500' 
elevation in Boulder Canyon, on 8 July several large larvae 
were taken on huge plants of Sisymbrium altissimum L. 
[R.C.R.]. The next day a female E. ausonides was observed 
at Nederland ovipositing on small plants of S. altissimum 
[R.C.R.], and on 22 July several large larvae were found 
there on the same species of plant. Also on the 22nd, a fe- 
male was seen laying two ova on A. fendleri spatifolia. 
These two ova were laid in a remarkable manner, being 
fastened by their sides to flower buds, rather than attached 
by the base and standing out at right angles to the sub- 
stratum as is uniformly true of the thousands of other ova 
I have seen laid by females of a score or more species of 
Pierididae. It is clear that species of Arabis and Sisym- 
