Dark-veined white

Appearance

Seitz-"bryoniae", which inhabits the Alps, Northern Scandinavia and the mountains
of Asia Minor; the male of the latter is rather more narrow-winged than "napi"-males, not bearing any markings on the forewing above except the blackish apical and basal areas; the female has a yellowish ground-colour, which is however more or less suppressed by the great extent of the dark scaling situated along the veins. Among the females there occur specimens in which the discal spots and the vein-streaks of the forewing are strongly obsolescent, there being consequently no prominent marking; we name this form ab. "obsoleta" nov.;

individuals in which the yellowish ground-colour, especially on the forewing, is almost entirely suppressed by the greater extension of the dark scaling may be named ab. "concolor" nov..The form "kamtschadalis" Bang-Haas i. 1., from Kamchatka, is in the female somewhat paler than "bryoniae"and the discal spots of the forewing are less sharply marked, the hindwing beneath being much paler. "sifanica" Gr.-Grsh., from Amdo, is nearly as large as "orientis" ["Pieris melete orientis" Oberthür, 1880]; in males the veins are broadly edged with greenish black beneath; it has not yet been ascertained if "sifanica" is really different from "orientis".

The main difference with respect to the phylogenetically similar species is the presence of much more marked alar veins on both wings, especially on the upper part. The female has a basic coloration ranging from yellowish to greyish-brown. In some cases, the male is almost indistinguishable, as sexual dimorphism is almost absent. In some cases there is a blackish-gray band along the entire external margin of the fore wing. On the rear wing the endings of the veins may widen to form dark triangulations. The summer generations are paler than the spring ones and, in general, the front wings are paler than the rear ones, as well as having less marked veins. Other less evident morphological characteristics are currently the subject of discussion among entomologists, given that their relevance appears only in restricted populations.The wingspan is between 4 and 4.4 cm. Ireland female "napi" are often heavily marked but Langham failed to find "bryoniae".

The type locality of the nominate form is the Alps, where it is found at considerable altitudes and has only one generation per year. Both pairs of the female's wings are dark. At lower altitudes, two or three generations appear during a year. Subspecies "neobryoniae", closely resembles the Carpathian populations, and is found in the southern parts of the Alps and ssp. "flavescens" Wagner inhabits the northern parts. The ground coloration of the wings is yellowish or rich yellow, often with a mauve gloss.

Behavior

In most areas of occurrence, they fly in one generation from May to September, only occasionally further generations can occur. The forage plants of the caterpillars include various cruciferous plants, for example "Biscutella laevigata" or "Lunaria rediviva". The species overwinters as a pupa.