Vol. xxiii] ENTOMOLOGICAL NEWS 2O3 



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 J9U. 



By the Members of the St. Louis Entomological Club. 

 Compiled by AUGUST 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, Calpodcs 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. 



