June, I902.J BUSCK : NORTH AMERICAN TiNEINA. 89 



sent to Dr. H. G. Dyar as possibly A. vittata, but his opinion was that 

 they were neither " true vittata " nor " trnt phakrafay 



From nah this form is separated easily, notwithstanding the extra- 

 ordinary resemblance of some of the aberrative forms of both sexes, by 

 the costal black line of the former. 



The great majority of A. pJialcrata have a broad and well-developed 

 ^ mark reaching from costal edge to inner margin and the normal 

 longitudinal stripes are not subject to notable change. In three 

 broods of this southern form there were not a dozen with a > mark 

 and then it was of slender design, never reaching the costa, but the 

 upper arm forming a hook. 



Arctia vittata Fabr., is a more robust moth. The abdomen of the 

 female is nearly black, the hind wings red or yellow with a broad 

 marginal band. The males of " vittata " have an incomplete ^ mark, 

 rarely reaching the costa, the m,arginal band on secondaries is mostly 

 broken up into spots. A singular (perhaps atavistic) aberrative form 

 of vittata occurred throughout a whole brood (Long Island); all the 

 males having a complete, diaphanous, marginal band on secondaries, 

 destitute of scales, only edged above with dull blackish. 



EXPLANATION OF PLATE XL 



Arctia )-adians Walker. ' 



Numbers i to i6 include all the varieties of the males. 



I, 2, 3 are individuals of the typical form. 4 to II show the gradual break- 

 ing up of the marginal band and development of longitudinal stripes. 

 12 to 16 are the rare forms with most complete 5; mark. 



16, with almost immaculate hind wings showing the incapacity to complete the 

 ^ mark ; rather tending to widen the longitudinal bands. 



17, is the normal female form. (The specimen from which this figure has been 

 taken does not have a black costa. ) 18, 19, 20 and 21 are examples deviating from 

 the nonnal forms. 



NOTES ON NORTH AMERICAN TINEINA. 



(Plate XIL) 

 By August Busck, 



U. S. Department of Agriculture, Washington, D. C. 



Helice Chambers. 



Chambers characterized this genus (Can. Ent., V, i88) with pal- 

 lidochrella Chambers, as type, thus : 



