10 BULLETIN NO. 3, DIVISION OF ENTOMOLOGY. 



state that on the Department grounds at Washington the newly-hatched 

 worms have been found in a folded clover leaf, feeding thus protected, 

 and under such circumstances as rendered it probable that they had 

 been hatched there. 



Mr. Loekwood stated in his report (see last Annual Report of this 

 Department) that even the common rag- weed (Ambrosia artemisicefolia) 

 was eaten clean by the worms, and also that the worms in passing 

 through a strawberry patch devoured both the leaves of the plant and 

 the unripe fruit. 



In order to establish upon proper authority the facts concerning what 

 the Army Worm will and will not eat when pushed by hunger, we con- 

 ducted during the summer of 1881-'82 a series of experiments upon dif- 

 ferent plants, placing each plant in a separate breeding-cage with a few 

 healthy half-grown larva?. The results show an unexpected power of 

 accommodation to plants in many families, and no resultant variation 

 in the imagines worth mentioning. 



The results are summarized below : 

 Pap averages. — Papaver somniferum. (Garden poppy.) 



Of four larva? all attained full growth and entered the ground. Three 

 moths issued. 



Crf/ciferje. — Brassica oleracea, (Cabbage.) 



The four larva? in this case moved restlessly about for the first day 

 without feeding. The second day they began to feed, and by the fif- 

 teenth all had changed to pupa. In this state two died, but the other 

 two issued as moths. 



Crucifer^e. — Baphanus sativus. (Raddish.) 



Of four larva? two lived to issue as moths; one died in the pupa, and 

 one in the larva state. 



Malvaceae. — Gossypium lierbaceum. (Cotton.) 



All died after feeding slightly. 

 Vitace^e. — Titis labrusca. (Grape.) 



All died without feeding. 

 Leg-tjminosje — Pisum sativum. (Garden pea.) 



Of five larvre, all fed abundantly ; transformed and issued as moths^ 

 Leg-uminos^e. — Phaseolns vulgaris. (Garden bean.) . 



All died without touching the leaves. 

 Rosacea. — Fragaria virginiensis. (Strawberry.) 



The four larva? experimented on all fed for from seven to ten days 

 and then died without transforming. 



Rosacea. — Bubus strigosus. (Raspberry.) 



Of eight larva?, all fed well and all transformed to pupa? ; only four, 

 however, issuing as moths. 



