THE CANADIAN ENTOMOLOGIST. 



I had a large number of chrysalids from the larvae obtained, and at 

 intervals a single butterfly would emerge. Thus one male 19th Aug., after 

 about thirty days in chrysalis. Sept. 1st, one male; and during my 

 absence from home, some time between 3rd Sept. and 20th, one female 

 emerged, and these were all. The other chrysalids will give butterflies 

 next spring. During the period between the forming of the chrysalids 

 and 1st September I occasionally saw a few examples of the butterfly on 

 the wing, one here and one there, but there certainly was no regular brood 

 subsequent to July. And all the butterflies seen were smaller than those 

 of June, and corresponded in this respect with those that emerged in my 

 boxes. Such of the females as appeared in September were just in time 

 for the fall food plant of the species, Aclinomeris squarroia, which begins 

 to bloom then. I have formerly related the discovery of the larvae of 

 pseudargiolus on the flower heads of this plant by Mr. T. L. Mead, and 

 that the butterflies which emerged in the spring from the chrysalids of 

 pseudargiolus were proved to be violacea ; Can. Ent. vii., p. 81. This fall 

 I was absent till 20th Sept., and until the few plants of Artinomeris squar- 

 rosa known to me and near at hand were nearly or quite out of bloom, and 

 I failed to find any of the larvae. It is true that in confinement they will 

 eat the flowers of Artinomeris helianthoides, an excessively common plant 

 here, but it would be useless to search on this for the larvae because it is 

 so common, and I am confident they always prefer the other when to be 

 had. But 1 2th October I chanced to be some miles away from home and 

 to find on the edge of a corn-field several plants of squarrosa in full 

 bloom. These I examined one by one till I found twelve larvae in various 

 stages up to last. It is worth notice that whereas the summer larvae, 

 feeding on Cimieifuga, are white and of the color of their food, in the 

 fall, feeding on a yellow flower, they are dusky and green. I watched 

 carefully for ants and presently had the satisfaction of seeing one come 

 across the flower head to one of the largest larvae. It manipulated it for 

 a moment and then departed, and seemed to me to have expected some- 

 thing from the larva and to have gone off disappointed. This Artinomeris 

 is as bitter as the summer plant is sweet, and it is less likely that the larvae 

 living on such food would exude or secrete saccharine matter than in the 

 other case. I immediately sent the largest larva to* Dr. Hagen, and in 

 due time received a card with his reply : " Dr. Mack found directly three 

 secretory organs." The next day a letter, thus : " I have examined care- 

 fully your larvae, and some in alcohol of Lycaena argus and corydon. All 



