264 LEPIDOPTERA. 



Bloxworth, Dorset, by the Rev. 0. P. Cambridge in 1854. 

 I know of no other records in the United Kingdom. Abroad 

 it is also a local species, but is found in France, Northern 

 and Central Germany, Northern Italy, Hungary, and 

 Galicia. 



Genus 64. HYDRILLA. 



Antennae ciliated ; eyes naked, lashes hardly perceptible ; 

 thorax narrow, loosely tufted with scales, but not crested ; 

 abdomen long and very slender, without crests ; fore wings 

 broad, rather squared, blunt behind, markings obscure ; hind 

 wings ample, of thin texture, cross-bar hardly perceptible, 

 vein 5 excessively thin and weak. Female much smaller, 

 with narrower wings and short stout body, very different. 



We have two species — readily separated : 



A. Fore wings dirty grey-brown. H. imlustris. 



A^. Fore wings brownish-white. H. arcuosa. 



1. H. palustris, Hi'ib. — Expanse of male 1|- inch, of 

 female f to | inch. Thorax of the male very small, rather 

 rounded ; abdomen long and slender ; fore wings dirty grey- 

 brown, a black sjDot at the end of the discal cell, and beyond 

 it a much indented slender transverse line ; hind wings 

 large, thin, white. Female about one-half the size, with 

 narrow blacker fore wings and short stout body, 



Antenna3 of the male rather thick, cylindrical, simple, 

 finely ciliated ; palpi very small and but narrowly tufted, 

 black-brown, apical joint rather long; bead dark brown, 

 tufted with long scales between the antennae ; thorax small 

 and rather round, covered loosely with long scales, dark 

 brown ; fascicles small, brown ; abdomen rather cylindrical, 

 long and slender, dark brown ; lateral and anal tufts more 

 reddish-brown. Fore wings rather bi'oad ; costa nearly 

 straight ; apex bluntly angulated ; hind margin almost per- 

 pendicular to below the middle, thence a little rounded off; 

 dorsal margin rather long and faintly curved ; colour dirty 



