1899.] 185 



of Europe. Not uncommon, but somewhat local, in Britain (it was 

 not recognised by Stephens). 



There is a matter of considerable importance concerning this 

 species that has not yet been fully elucidated. From a broad point 

 of view there appear to be two forms, one large and dark, the other 

 small and pale, and these, although connected by intermediate con- 

 ditions, are likely to deceive an inexperienced student. My observa- 

 tions need maturing, but 1 am inclined to think the large and dark 

 forms belong to the generation that appears in spring, and the small 

 and pale forms to one that appears in summer, or at any rate, that 

 the majority of each form may be thus accounted for. 



H. MiCANS, Olivier (1792),* Schneider, Wesmael, Hagen, Brauer, 

 McLach., Wallengr., Rostock, &c. 

 punctatus and paUidus, Steph. 

 lutescens, Burm., nee F. 

 irroratus, Costa. 

 var. <^ , fuscinervis, Schneider, Wallengr. 



The general colour of the whole insect is pale yellow. Sides of the pronotum 

 broadly brownish. Anterior wings whitish with a yellowish tinge, highly iridescent ; 

 neuration pale, the costal nervules and longitudinal nervures with rather distantly 

 placed short dark streaks, on each of which is a very faint pale grey cloud, gradate 

 and other discal nervules dark, very faintly clouded with pale grey ; pteroetigmatic 

 region yellowish. In the posterior wings the neuration is wholly pale, save that the 

 gradate nervules appear dark in certain lights. Expanse, 11'5 — 16 mm. 



Appendages of the (J elongate, broad at the 

 base, but gradually attenuate to the apex, which 

 is slightly dilated and shallowly furcate, the 

 branches divergent, the upper long and slender, 

 its apex acute and turned strongly inward, the 

 lower shorter and thicker, the apex obtuse and 

 scarcely turned inward. 



Probably spread over the whole of 

 Europe and usually common : it is not, 

 however, included by Keuter amongst the 

 Finnish species. 



var. (^ (fuscinervis, Schneider). 



Darker than the type-form ; the antennsB 

 slightly annulated. Wings very pale greyish without the yellowish tinge : in the 

 anterior the sub-costa and the costal and gi'adate nervules are wholly fuscescent, and 

 the dark streaks on the longitudinal nervures are longer and sometimes confluent : 

 in the posterior wings the neuration is darker, the sub-costa, costal and gradate 

 nervules fuscescent as in the anterior. 



