118 



Fore-wings, pale saffron, with a ratlier golden tinge; a broad -white basal streak on 

 the upper half of the wing, running parallel to the costal margin for one-third 

 the wing-leugth, thence deflexcd and confluent with the middle of the upper 

 edge of the first very broad white dorsal streak. The basal streak is sometimes 

 extended at the base across the fold reacliiug to the dorsal margin, thus leaving 

 between itself and the fust dorsal streak a small curved, oblique saffron streak; 

 sometimes it is not thus projected across the fold, but upon the dorsal margin be- 

 neath it is found a separate short dorso-basal white dash. Above and slightly 

 beyond the point at which the broad basal streak is deflexed there is a very ob- 

 lique costal streak, somewhat triangular, with its apex reaching nearly to the 

 apex of the much larger first dorsal streak below i t ; beyond this the second streak, 

 situated just beyond the middle of the costal mai'gin, is of about the same size, also 

 triangular, a little less oblique, and corresponding with a wider and more con- 

 spicuous white dorsal patch opposite to it. The third and fourth costal streaks, 

 of which the former points slightly outwards. The latter is perpendicular, 

 reaching nearly (or in some specimens quite) to a white patch on the dorsal mar- 

 gin before the apex, which seems to consist of two confluent white dorsal streaks. 

 At the extreme apex is a minute black apical spot, surrounded by a semi-circular 

 dark line at the base of the apical cilia, which are tinged with golden saflrou at 

 the extreme apex. Beneath the apex the cilia are white, blending into saS'ron- 

 gray about and before the anal angle; all the white markings are distinctly 

 dark-margined on all sides. The white streaks on the fore wings of this species 

 are so large and conspicuous as in some cases to almost obliterate the pale satitVon 

 ground-color, and different specimens vary much iu the proportionate space oc- 

 cupied by one and the other. 

 Uind wings and cilia, pale gray. 

 Abdomen and anal tuft, grayish-white. 

 Hind tarsi, whitish, spotted above with gray. 

 Exp. al. 9"™. 

 Type $ 9 Mus. Wlsm. 



I met with this very beautiful and distinct species in June, 1871, in Lake and Men- 

 docino Counties, California, and again on Mount Shasta, Siskiyou Count.y, in August 

 of the same year. It is evidently a scarce species, as I met with a single specimen only 

 on each of the four difterent occasions. I am unable to give auy information as to 

 its larval habits. It seems to belong to the same group aaJltclieUa and the European 

 species rohoris, but differs very greatly in the form of its markings. 



In addition to the known American species of this genus, I have received two more, 

 which are undescribed, from Dr. Riley, one feeding on Grindclia rohnsta, the other on 

 Betula. I prefer to leave their description to my distinguished friend, who has prob- 

 ably a better series of specimens to refer to than I have. 



I am indebted to the late Professor Bolander, of San Francisco, and to Mr. W. Car- 

 ruthers, of the British Museum, for the identification of some of the plants mentioned 

 iu this paper. 



The following is a list of plants, with the species of LithocoUetis, which feed upon 

 them, so far as they are known to me. I have published this iu the hope that it may 

 facilitate the collection of further information concerning the life-histories of the very 

 numerous species belonging to this interesting genus. 



