IQ THE CANADIAN ENTOMOLOGIST. 



niargii), as a general rule, whereas, in ihe American, it is the same width 

 from c )Sta to inner margin. Packard's statement that the outer margin is 

 cletr has 1 ttle weight, as it is so in most forms of/urcafa Thunb., except 

 in var. infuscata Staudinger, where it is smoky-brown. The type, one 9 » 

 Caiif (Behrens), is in the Packard colkction. 



yar. (B) viridaia Pack., Proc. Boston Soc. Nat. Hist., XVI, p. 21, 

 1874. Monograjjh, p. loi, 1S76. 



Short palpi, greenish. 



In his original descri])tion Packard calls attention to this form as 

 being cl )se to quijiquefasciata, and he is quite correct, as it is a greenish 

 variciy i>{ fiircata I'hunb., and is almost exactly like German examples of 

 var. sordidaia Fab., which is the green form of the European varieiy. 

 Variety viridaia niay sink later to a synonym of sordidata if we get tiie 

 \\^\^ Jiircaia here. 'I'he i)alpi of the type are only nuulcrate, and not ioi.g 

 as Packard states, and the ground colour of the fore wings is greenish- 

 yeliow. The type, i 9 , CaUf. (Behrens), is in the Packard colleciion and 

 very ]3erfect. 



Var. ((') sordidata F.ib., Ent. Syst., Ill, pt. 2, 1S5, 1794. 



Sli')rt palpi, heavily irrorated, greenish. 



Tnis green form I retain in our lists until it i-i j^roved that the Euro- 

 ])ean one does not occur here, but if it dees, then viridaia Pack, will 

 become a synonym of var. sordidata. Th-. re is very little difference be- 

 tween tl e I wo in the markings, but until the geni::alia are studied we 

 cannot be ce;tain as to their standing. Hyd. sordidata in Europe is said 

 to feed on the willow, but we have no records of the food-[)l.int of viridaia 

 here. Mr. Fred. X. Williams, of San Franci-co, sei t me a specimen from 

 there, captured May 12th, 1909, that is very cl )se to specimens in my 

 collection from Germany, excejjt that the basal liF^.e is broader, as is also 

 the extradiscal, and straighter, which may be the differentiating point 

 between the North American and European forms. So sordidata becomes 

 a vaiiety and not a good species, on account of Thunberg's jiriorit}'. 



Var. (D) reseda Swett, Can. I^nt., V(1. XLII, Aug., 19 10. 



Short palpi, reddish ground colour. 



This is the red iox\-\-\ o{ furcata Thunb., and corresponds to the 

 Euroi)ean, red varieiy, tesiaceaia Prout, only the markings are same as in 

 furcata. This is very similar to Hyd. reflaia Grote, only the latter is gray 

 and has a broad black mesial band where reseda is reddi-h, and 

 has a narrow mesial band, which al-;o distinguislies it from the red- 

 variety Q){ reflata which sometimes occurs in Arizona. This form reseda 



