ON THE DIMORPHISM OF TERAS OXY- 

 COCCANA, PACK. 



The following notes are essentially as they will appear in Bulletin 

 No. 4, Division of Entomology, Dept. of Agriculture: 



In the "General Inde.x and Supplement to the nine reports on the 

 Insects of Missouri," 1881, in speaking of Tortrix Cinderella Riley, 

 we remarked as follows (pp. 82-83): 



' ' From specimens reared from cranberry-feeding larvae received from 

 Mr. John H. Brakeley of Bordentown, N. J., I am satisfied that this is 

 the same species briefly characterized by Packard in the first edition of 

 his Guide (p. 334) as Tortrix oxycoccana, and that T. malivorana Le 

 Baron (my Rep. IV, p. 47) is but a dimorphic orange form, subse- 

 quently described by Packard as T. vacciniivorana (Hayden's Report 

 of the U. S. Geol. and Geogr. Survey of the Territories, 1878, \). 522). 

 The orange and ash-gray specimens are thus bred both from A})ple and 

 Cranberry. I have reared both forms from Cranberry and from Apple, 

 and they are undistinguishable in the larva and pupa states. The gray 

 form is often more or less suffused with orange scales and the orange 

 form less frequently with gray scales. This is the most remarkable 

 case of dimorphism with which I am familiar in the family, and points 

 strongly to the important bearing of biological facts on a true classifi- 

 cation. The dimorphic coloring is not sexual, but occurs in both sexes. 

 The eggs of this species are very flat, circular and translucent, with a 

 diameter of 0.7 mm., and are laid singly on the under side of the leaf 

 near the midrib. The species belongs to the genus Teras, and as 

 Packard's specific name oxycoccana has priority, the insect should be 

 known as Teras oxycoccana, Pack. The insect, according to Mr. 

 Brakeley, who gives an account of it in the Report of the vSeventh 

 Annual Convention of the New Jersey Cranberry Association (1879, p. 

 7), commonly affects, also, the high-bush whortleberry. The gray 

 form of the moth is most frequent in autumn.'' 



Prof C. H. Fernald, in his " Synonymicfel catalogue of the de- 

 scribed Tortricidae of North America, north of Mexico," 1882, still 

 retains the four insects as distinct species, and thus doubts the correct- 

 ness of our conclusions. We therefore took pains to put the question 

 to so full a test as to leave no reason for doubt. The experience of 

 Mr. |. B. Smith, in the field, is confirmatory; but from material which 

 he sent on to Washington, we not only actually bred the orange form 

 from the first brood of larvae received in May and produced from the 

 hibernating slate-colored form, but also the slate-colored form from 

 larvae hatched from eggs laid bv the orange form. Over two hundred 



