70 BKITISH BUTTERFLIES AND MOTHS 



with 16 legs, but the two first pairs of ventral prolegs 

 are short and useless in walking. 



We have only 2 British species, Brephos Parthenias 

 and Notha. 



17. PLUSID^;. Imago with the antennae filiform ; 

 the thorax with raised tufts ; the abdomen crested ; the 

 anterior wings smooth, shining, often with metallic 

 spots ; in repose the wings form a very sloping roof. 

 Larva with 12 or 16 legs, half-looping, attenuated in 

 front ; feeding exposed on shrubs or herbaceous plants. 

 Pupa in a silken cocoon, not subterranean. 



This family includes the Spectacle, the Burnished 

 Brass, the Golden Y, and the Silver Y. We have 11 

 British species. 



18. GoNOPTERnxE. Imago with the antennae short, 

 ciliated in the male, the thorax with raised collar ; the 

 abdomen flattened and truncate in both sexes ; the an- 

 terior wings broad, angular, and deeply indented. Larva 

 smooth, with 16 legs ; feeding exposed on leaves of trees. 



We have only 1 British species, Gonoptera libatrix. 



19. AMPHIPYRID.E. Imago of moderate or large 

 size ; the abdomen much flattened. Larva smooth, 

 with 16 legs, attenuated in front. 



This family includes the Mouse and Copper Under- 

 wing, with Mania typica and maura. We have only 

 4 British species. 



20. TOXOCAMPIDJS. Imago of moderate size; the 

 thorax smooth, with a raised dark-coloured collar ; ab- 

 domen smooth, rather flattened ; the wings not dentate. 

 Larva smooth, elongate, attenuated at each end, with 16 

 legs, the first two pairs of ventral prolegs rather short. 



We have only 2 British species, Toxocampapastinum 

 and T. Craccae. 



