Vol. xxiii] ENTOMOLOGICAL NEWS 203 
All specimens studied have, I believe, a nature color pattern 
which would not have varied with increasing age, though I do 
not know how early in the life of the imago this pattern is at- 
tained, since I have no teneral material before me, and I have 
no notes on the colors of recently emerged imagoes. Thoracic 
pruinescence appears first ventrally, occupying the bases of the 
legs and the metepimeron, then the pale areas of the thorax, 
and finally, in older individuals, including the entire thorax 
and obscuring the thoracic pattern. It can be removed by gen- 
tle rubbing or scraping. Pruinescence of the apical abdominal 
segments appears later in the life of the imago than the first 
traces of thoracic pruinescence. These two species of Argia 
begin to show thoracic pruinescence earlier in imaginal life 
than any other dragonflies known to me. 
Observations on the Lepidoptera of St. Louis, Mis- 
souri, and vicinity during 19/1. 
By the Members of the St. Louis Entomological Club. 
Compiled by Aucust KNETZLER. 
The opening of the season, being quickly followed by hot 
weather and a protracted drouth, brought out some unex- 
pected features, the most striking of which was the wonderful 
abundance of the entire Colias family and the scarcity of Pa- 
pilios. Particularly surprising was the appearance in large 
numbers of Dione vanillae, specimens of which could be seen 
daily on the city streets from August till November. The 
larvae of this beautiful insect were found feeding on Passi- 
flora in several gardens. No less remarkable was the first ap- 
pearance here of the fine large Hesperid, Calpodes ethlius, of 
which not only were there several fine specimens taken, but 
the larvae also were discovered feeding on Canna by Mr. 
Ernst Schwarz, who bred several with good results, the ima- 
goes emerging even after our first heavy frost. Another new 
Hesperid, male and female, not yet determined, was taken by 
Mr. Paul Schroers. 
