48 Mr. R. H. Lewis's Descriptions of 



superior margin densely clothed with spinulse ; the inferior 

 margin with seven or eight spines, gradually increasing in size 

 from the base of the tibia to the apex ; internally, with a 

 scanty row of spinulae, directed downwards, and a very dense 

 row of fine cilia, directed inwards ; the apex surrounded with 

 small spines. Tarsi triarticulate ; the anterior with the ter- 

 minal joints, and the posterior with the basal joints longest. 

 Allied to Agallia, Curt., Bythoscopus, Germ.*, &c. ; but the form 

 of the head and apex of the anterior pair of wings will readily 

 distinguish it from these. The very remarkable form of antennae 

 of the male does not, I believe, exist in any other Homopterous genus, 

 nor have I found it noticed by any author. In addition to this, the 

 males of some species possess another peculiarity : the costa is in 

 the middle incrassated and obtusely dentate (fig. 1, c.) ; in others 

 it is simply incrassated, and in others simple. As far as I have 

 been able to ascertain, all the species are inhabitants of various 

 species of willows. Their wings are for the most part beautifully 

 iridescent. 



Sp. 1. Id. stigmaticalis. Sub-fuscus, mas, maculd stigmaticali 

 ochred ; fcem. capite suh-ochreo, maculd ohcordatd nigricante medio 

 frontis, maculdque trigonatd distinctd prope oculos nigrd. 

 Long. corp. 2-i- lin. Exp. alar. 6 lin. 



Male. Beneath pale ochreous. Head, particularly the face, 

 bright ochreous ; the forehead with a semicordate dusky mark, on 

 each side with a small black excavation. Thorax posteriorly 

 greyish brown variegated with fuscous, anteriorly pale ochreous 

 with black spots. Scutellum pale ochreous ; on each side at the 

 base with a black trigonate spot ; in the middle with a black fork- 

 shaped mark, having on each side a fine black dot. Superior Avings 

 semitransparent ; the place of the stigma with a brilliant ochreous 

 spot ; the costa obtusely dentated, at the base ochreous, in the mid- 

 dle black ; the nervures dark fuscous ; in the middle of the wing very 

 dark, with fuscous diffused over the Aving, forming, as it were, an 

 oblique fascia ; beyond which are three white nervures, forming an 

 oblique hyaline fascia ; the sutural margin dark fuscous. Inferior 

 wings hyaline, with black nervures. Abdomen above black, with a 

 slender pale margin to each segment. Tibiae externally with black 

 lines. 



Female. Beneath dirty cream colour. Head very pale ochreous ; 

 the forehead in the centre with a large obcordate blackish mark, on 



* Vide a paper of Professor Germar's in Silbermann's ' Revue Entomologique.' 

 lasxtit lavio, Fab., is the type. 



