40 PTEEOPHOEUS. 



Two varieties of this species are recorded by Prof. 

 Zeller from Texas and Ohio (Verh. z.-b. Ges. Wien, 

 xxiii. p. 326); and in Verh. z.-b. Ges. Wien, xxv. 

 pp. 355, 356, the same author discusses the identity 

 of Pt. pergracilidactyluS) Packard, and Pt. cinerei- 

 dactylus, Fitch, with this species, Mr. Packard, in 

 the Rep. Peab. Ac. Sc. vi. p. 88, 1874, having pointed 

 out that these two names should be considered to 

 refer to the same species. 



I have several varieties from different localities in 

 California and Oregon, two of which are figured to 

 assist those who do not possess European specimens 

 in determining the extreme limits of colour between 

 which they are found to range. I bred two speci- 

 mens from larvae feeding on a plant which was 

 unfortunately not recognized at the time ; and I am 

 unable to say whether it was or was not one of the 

 Convolvuli. 



One distinguishing peculiarity of this genus and 

 species, whether in Europe or in America, by which 

 it may always be immediately recognized, is the pre- 

 sence of brush-like tufts of appressed scales on the 

 upperside of the hind feet ; in good specimens these 

 are noticeable on each of the tarsal joints below the 

 second pair of spurs. 



This character is not mentioned by Wallengren in 

 his Latin summary of the generic characters of Ptero- 



