222 THIRTIETH REPORT ON THE STATE MUSEUM. [HO] 



XXII. ON THE IDENTITY OF TWO FORMS OF HYPENIM. 



In the Transactions of the American Entomological Society 

 Vol. IV, pp. 105, 106, Sept. 1872, Mr. Grote describes Tortri- 

 codes bifidalis and T. indimsalis, provisionally as two spe 

 cies. He indicates the principal difference between the two, 

 to lie in a cleft in the outer margin of the primaries of bifidalis. 

 Although designating them by different specific names, he 

 remarks, &quot; I am inclined to consider the two forms merely as 

 sexes of one species, with the fore-wings cleft in the male. 

 And with four specimens of T. bifidalis before me, and eight 

 of T. indimsalis, I cannot but be sure that most, if not all, of 

 my T. bifidalis are males, and of my 7. indimsalis, females. 

 * * * I shall then not be disappointed if the two should 

 prove to be sexual forms of one species.&quot; 



Subsequently, same vol., page 308, Jan. 1873, Mr. Grote 

 writes : &quot; Mr. J. A. Lintner informs me that he has both sexes 

 of Tortricodes bifidalis with cleft primaries. I then refer T. 

 indimsalis to HETEROGRAMMA Guenee, believing our species 

 not to differ generically from the Brazilian species which M. 

 Guenee uses for his type.&quot; 



In accordance with the above reference, the two forms have 

 been known up to the present as Tortricodes bifidalis and 

 Heterogramma indimsalis. 



In a recent study of a considerable number of examples of 

 each of the above two forms, collected at sugar, during the 

 months of June, July and August of 1875, I was surprised to 

 find that among so many, all having the cleft wing were males, 

 and all with the entire wing, females. Suspecting, from this 

 discovery, that the two were but one and the same species, I 

 examined my cabinet example of T. bifidalis &quot;female,&quot; and 

 found that I had been misled by an unnatural position which 

 the frenulum had assumed, but that it was unquestionably 

 simple, not yielding even to pressure after having been de 

 tached from the wing, and, therefore, indicating a male. 

 There was then, no doubt of the specific identity of the two 

 differing forms. 



