1887.] PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 343 



somewliat recurved baud to the center of the wiug. Secoudaries clear 

 jellow, usually with a blackish spot of variable size near to the anal 

 angle ; sometimes this spot is wanting altogether. Beneath yellow with 

 the markings of upper side faintly reproduced, the recurved band from 

 inner margin most distinctly. 



Expands 1.00-1.75 inches ; 40-44'"'". 



Habitat. — Canada to Georgia, west to Illinois, Missouri, Wisconsin, 

 Indiana, and Kentucky'. 



This species is very constant in color and maculation, and dozens of 

 specimens will present the same uniformity of appearance. 



In the Proc. Dav. Ac. oST. Sc, ii, -575, Mr. Strecker calls attention to 

 some interesting hybrids. He describes a lot of specimens received 

 from Southern Indiana, and says : " But among this lot were also a 

 number of examples that at first fairly i)uzzled me. They were marked 

 exactly like some varieties of Lecontei, and one was immaculate like the 

 var. fulvicosta of that species ; but the ground color of these was a pale 

 bulf, a little darker than in the primaries of intcrruptomarginata in- 

 stead of being white ; but independent of this uniform yellow color of 

 all wings and body they were to all intents LeconteV^ He further re- 

 cords the receipt of a $ interrvpto-marglnata and a S lecontei^ taken m 

 copula, and that from the eggs of this 2 he obtained larvae, three of 

 which produced imagoes which had the maculation of lecontei with the 

 color of interrupto-marginata. On pi. iv, f. 5 and 6, two of these are 

 shown, and the markings are precisely those of miUtaris Havr. (See pi. 

 xiv, fig. 3). 



In Cau. Ent., xi, 47, Mr. Siewers mentions among other things the 

 liabit of the moth to fly with a darting motion a few yards at a time, 

 and then, after apparently settling, to continue their flight between the 

 weeds upon which they are said to feed, Eupatoriiim ageratoides. He 

 also mentions and describes certain anal apendages of the male as fol- 

 lows : " Out of the hind segments there issued two plumes over an inch 

 long and less than one-sixteenth in diameter, so light that the least 

 breath of air fluttered them from side to side. They w ere cut in numer- 

 ous vertical segments and sparsely covered with short hairs, were semi- 

 transparent, and evidently air-inflated." Mr. Siewers considered these 

 organs as aids to flight, but observation since made shows that they 

 have other functions. I cannot find that they have been observed 

 since. 



In the tenth vol. Can. Ent., p. 84, the larva is described in a general 

 way on snake- weed. " The weeds were covered with the larvae, of a 

 bright yellow color with a white lateral stripe, mottled along its upper 

 edge with briglit red, the anal end being also faced with red markings. 

 The length about 1^ inches." None were raised to maturity, and that 

 these were the larvae seems to have been a guess, though made as a 

 positive statement. Mr. Strecker's description in Pr. Dav. Ac, ii, 276, 

 is from larvae obtained from eggs and carried to maturity, and differs 



