. Abstract of proceedings of the South London Entomological & Natural History Society. South London Entomological and Natural History Society; Entomology; Natural history. 97 tinct from our other species there is no doubt, for the superior wings are formed more like those of Cerigo texta (= Cerigo matura, Hufn., = eytherea, Fb.), the stigmata are larger than those of T. orbona (= comes), the fascia of the inferior wings is broader, and the supe- rior margin beneath is black, not ; From these remarks it is evident that he compared it with our ordinary South English forms, and no w
. Abstract of proceedings of the South London Entomological & Natural History Society. South London Entomological and Natural History Society; Entomology; Natural history. 97 tinct from our other species there is no doubt, for the superior wings are formed more like those of Cerigo texta (= Cerigo matura, Hufn., = eytherea, Fb.), the stigmata are larger than those of T. orbona (= comes), the fascia of the inferior wings is broader, and the supe- rior margin beneath is black, not ; From these remarks it is evident that he compared it with our ordinary South English forms, and no wonder the differences noted were sufficiently convincing; but how much more remarkable is the difference between the South-east European forms and the extreme forms from Orkney ? Not only is there a vast difference in orna- mentation, but the European examples are considerably larger and proportionately much more robust in structure than the Desquamated wings of TriphcBna Asia Minor. Orkney. Orkney representatives. The desquamated wings now exhibited show this very clearly ; and although there does not appear to .be any actual difference in the venation itself, it is noticeably slighter in structure in the Orkney insect, more particularly in the fore- wings. In approaching the question of the probable line followed in arriving at this remarkable form of variation, it may assist us if we con- sider the matter under two heads, namely, retrogressive variation and progressive variation. The running together of certain spots on the under sides of the Lycsenidse, the appearance of unusual markings in the members of some other groups, and similar phenomena gene- rally accepted as cases of atavism,* do not appear to me to offer an explanation in this instance. Such cases are generally of infrequent occurrence, and in parallel forms of variation among members of several nearly allied species, and are not necessarily confined to any particular district; but we do not find a simil
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