NORTH AMERICAN LEPIDOPTERA. 107 



with buffaloeiisis and uniformis as synonyms. jVIr. Strecker's idea has 

 this in its favor, that it associates the forms with similar outer mar- 

 gin, while Mr. Grote's arrangement is inconsistent in that resj)ect. 



Boisduval's species are undoubtedly synonyms of some of these 

 thy she forms. 



Mr. Butler, s})eaking of ruficaudis Kirby, says that he thinks 

 Walker's identification correct, and considers this as the American 

 representative of H. fiiciformis, but in some respects more nearly 

 allied to H. floridensis G. & R. 



Of H. buffaloeiisis, he says it is closely allied to, if not identical 

 with H. ruficaudis ; the body, however, seems greener in coloring, 

 and the cell of the primaries less open. 



Of H. floridensis, again, he says it is allied to fuse icmid is, but with 

 the external margin narrower and not dentated ; in H.fuscicaudis it 

 is much more strongly dentate than in H. thysbe. 



Finally, Mr. Hulst raised thysbe from uniformis, settling the ques- 

 tion of their identity. The size, he says, is subject to much variation, 

 and the specimens are made large or small, or, in other words are 

 made the i'orms fioridensi,H or uniformis, almost if not quite at one's 

 pleasure by different methods of rearing. Reared in a glass jar, 

 with much moisture in the air, with high average temperature and 

 with plenty of food, and the result is florideiisis ; reared in the open 

 air, with neglect in food, and the result is uniformis. As it was, by 

 rearing in the open air under practically the same circumstances, the 

 spring form varied from 45 mm. to 56 mm. in expanse of wing. 

 The thysbe form varied much less in expanse than did the other. 

 The imagines of the thysbe form varied in the same brood in the 

 depth of the dentations on the exterior band of the fore wings. 

 One specimen was almost without dentations, and one had them 

 reaching almost half way across the transparent space. In most 

 before flight, the transparent costal spot was covered with scales so 

 as to be entirely indiscernil)le. These were more or less lost upon 

 flight, though more jiermanent than the scales at first covering the 

 central transparent portion of the wings. 



Mr. Hulst adds the following synonymy as the result of his studies : 



Macroglossa thysbe Fabr. 



" pelasgus Cramer. 



" cimbieiformis Stephens. 



