180 THE COMMONER BUTTmFLIES. 



cases, the full-grown caterpillar may hibernate. The eggSj 

 which are pale green, nearly hemispherical, with very large 

 white-walled cells, are laid singly on the stem or leaf of the 

 sorrel, the food-plant of the caterpillar, and hatch in from 

 six to ten days according to the season. In escaping from 

 the Qgg, the caterpillar eats only a small hole at the top, 

 and then feeds on the thick parenchyma of the leaf, 

 ploughing its way, first on the under, afterwards indiffer- 

 ently on the upper or the under surface. It goes to the 

 under surface of stones to change to chrysalis, and this 

 state continues, except in winter, from ten to nineteen days 

 according to the season. 



33. Genus Feniseca. 



FENISECA TARQUINIUS-THE WANDERER. 



(Polyommatus tarqiiinius, Chrysoplianus tarquinius, Polyommatus 

 porsenna, Polyommatus crataegi.) 



Butterfly. — Upper surface of wings pale fulvous, broadly and, 

 especially on the fore wings, irregularly marked with dark brown, 

 marginal on the fore wings, basal on the hind wings, varying 

 greatly in the amount of encroachment on the fulvous disk. 

 Under surface pale reddish brown, the fore wings pale on the 

 disk, and both wings, but especially the hind pair, mottled with 

 pretty large, white-edged, dark spots, arranged on the hind wings 

 in transverse series. Expanse nearly 1| inches. 



Caterpillar. — Head small, pale green. Body largest in the 

 middle and tapering in each direction, naked except for rather 

 short hairs arranged in transverse patches across each segment, 

 and smoky brown marked with smoky stripes. Length nearly ^ 

 inch. 



Chrysalis.- -Plump with swollen abdomen, which is covered 

 with slight bosses and the hinder extremity flattened and lateral- 

 ly expanded ; pallid on the thorax, flecked with brown, dark 

 greenish brown on the abdomen, flecked or blotched with cream 

 yellow. Length ^ inch. 



This is a southern butterfly, which, however, extends to 

 the northernmost parts of our district in the East, but in 



