March, 1920.] DiCKERSON & WeISS : EVEXIXG PrIMROSE InSECTS. 73 



Acknowledgments 



We are greatly indebted to the following persons for help in the 

 preparation of this paper : to Mr. C. W. Leng for references to the 

 literature of the Coleoptera and identifications in this order, to Mr. 

 C. A. Frost for determinations in the Coleoptera, to Mr. H. G. Bar- 

 ber for identifying the Hemiptera, to Mr. M. R. Smith for deter- 

 mining the ants, to Mr. August Busck and Mr. Carl Heinrich for 

 their help with the micros and other Lepidoptera, to Dr. C. P. Gillette 

 and Mr. L. C. Bragg in connection with the plant lice, to Dr. J. 

 Bequaert in connection with the Hymenoptera except the parasites, 

 and to the specialists named in the text who through the courtesy 

 of Dr. L. O. Howard identified the dipterous and hymenopterous 

 parasites. The photographs were taken by Mr. Erdman West, to 

 whom we are also grateful for many miscellaneous observations on 

 primrose insects. 



Explanation of Plates I, II and III. 



'A. Adult, Celerio lineata. 

 ' B. Lan-a of Celerio lineata. 



• C. Adult, Rhodophora florida. 

 » D. Adult, Apantesis arge. 

 »£. Adult, Eiithisanotia unio. 



• F. Adult, Desmia funeralis (after Strauss). 



, G. Primrose stem split lengthwise showing winter cells of Mompha eloisella 



lar\2e. Third cell from top shows the silken lining. 

 *//. Enlarged view of I. 

 • /. Single larval cell of Mompha eloisella. 



J, K. Primrose stem split showing larv;e and larval cavities of Tyloderma 

 foveolata. 

 . L. .\dult, Mompha eloisella. 

 M, N. Primrose leaves showing feeding of Haltica marevagans and Haltica 



fuscocrnea larvae and adults. 

 .0. Swollen primrose flower bud infested by the larva of Mompha stellella. 

 . P. Folded Jirimrose leaf containing pupa of Desmia funeralis, 

 Q, R. Primrose flower buds in different stages of development. 

 5. Seed capsule of evening primrose in different stages of development. 



