I trust that my loquacity in regard to the habits of this species will be pardoned. I consider the observation of facts touching the migration of animals, of the highest importance, and think it desirable that all observations on these points should be put on record: so that hereafter, when a sufficient number of instances may have been collected, conclusions may be drawn, and perhaps many hitherto inexplicable points in the geographical distribution of insects, and of organic life in general, may be explained. This butterfly is rather rare in common years, and is, perhaps, notwithstanding its name, _V. Californica_, not exactly an indigenous species, at least not in the middle counties of our State. Unlike all other _Vanessidæ_ known to me, it has but one generation, at least in California, where the imago is always found late in the season. I do not venture to decide whether _V. Californica_ requires a longer time for development in the larva state than the other _Vanessidæ_, or whether it has its vernal generations somewhere else in adjacent countries. I have found but one colony of caterpillars. It was in July, and most of the individuals were nearly full grown; they were rather delicate, the majority died in the larva state, seven transformed about the end of the month, and a single chrysalis produced a crippled butterfly. _Vanessa Milberti_ Godt. This species is common in woody localities. The caterpillar is very much like that of _V. Californica_, and only a few individuals show a distinguishing mark in the shape of a longitudinal, lateral stripe of sulphur yellow. It feeds on _Urtica_. _Vanessa Antiopa_ L. There is nothing to add in regard to this long and well-known species. The caterpillar feeds here, as everywhere else, on willows. The true Vanessæ have about the same geographical distribution as the Graptæ. They also have a predilection for Urticaceous plants. Only the most northern species is amphigeic. Europe. California. Atlantic Slope. _V. Antiopa._ _V. Antiopa._ _V. Antiopa._ _V. Urticæ._ _V. Milberti._ _V. Milberti._ _V. Polychloros._ _V. Californica._ _V. C-album._ There is a balance in favor of the Old World—the beautiful type of _V. Io_ not being represented on this continent—and also the type of _V. Polychloros_, containing a few species, as, for instance, _V. Xanthomelas_, that make it appear more numerous. PYRAMEIS Hubn. _Pyrameis Atalanta_ L. Larva feeds on Urtica. _Pyrameis Carye._