82 ' [September, 



Species 1. — Bytiioscopus alxi, Sclirank. 

 Cicada alni, Schrauk, F. B., vol. ii, 50, 105G. 

 lassies hlpustulatiis, Fab., Ent. Syst., vol. iv, 45, 79 ; Germ., Mag., 



vol. iv, 83, 10. 

 lassus alni, Boh., Handl., 50, 28 (1845). 

 J^ediojysis Heydeni, Kirschb., Cicad., 171, 2. 

 Pediojjsis alni, Thomson, Op. Ent., £asc. iii, 319, 5. 



Varies in colour from a semi-transparent greyish-wbitc to red- 

 disb-brown. 



(^ . Seutelhim with a black or brown triangular spot at each basal 

 angle ; in the $ nnicolorous. Claims, base with a more or less dis- 

 tinct (sometimes wanting) broad, whitish or greenish- white band. 



(J . Head yellow, and somewhat rugulose punctate. Crown with a broad black or 

 fuscous streak terminating in a black spot, at a little distance from each eye, and 

 divided in the middle by a narrow, yellow, central keel. Face yellow, with a 

 black spot at the ocelH, and au obhque, black, somewhat comma-shaped patch, 

 a little lower down, and moi'e interior ; side margins frequently pale brownish. 



Thorax : pronottim yellow, transversely, finely crenulate, between the crenulation 

 dark grey ; behind each eye a small black spot ; on each side next the anterior 

 margin a transverse, somewhat kidney-shaped, brown patch margined with black. 

 Scutellum lurid or yellowish, or pale brownish, very finely punctured ; basal 

 angles with a triangular blackish or brown spot, its ijiner margin not unfre- 

 quently black ; above the transverse somewhat arcuate channel are two small 

 black spots ; a longitudinal central line and the ajsex generally brown. Elytra 

 dark greyish-white or with a testaceous tinge, semi-transparent ; claims — umcr 

 margin white, apex narrowly and the space between the apices of the nerves 

 black ; suture piceous ; disc at the base with a broad, more or less distinct, 

 white band, apex of both nerves picoous. Corium : nerves piceous, the colour 

 of somewhat irregular width, so that the nerves here and there seem to bo 

 thickened ; anterior margin and first longitudinal nerve at the base pale. Ster- 

 num yellow : metastermim — the outer angle and a spot near the fulcra black. 

 Legs yellow ; fulcra — 2nd and 3rd pairs in front with a black spot ; thighs 

 generally with a longitudinal black streak on the inside and outside ; tihioi with 

 a black streak down the outer margin, very frequently in the 2nd and 3rd pairs 

 not reacliing to the apex ; tarsi — 3rd joint and claws black. 

 Abdomen — above black, base yellow, posterior margins of the segments yellow ; be- 

 neath yellow ; last genital segment brownish, the upper and lower margins, and 

 commonly two spots on the sides, dark brown, external processes short, more or 

 less brown. 



9 brown or reddish-brown. Scutellum without the blackish or brown triangular 

 spots at the basal angles. Clavus with a broad whitish or greenish-white baud 

 across the base. Corium — anterior margin and a portion of the disc from be- 

 yond the middle towards the apex more or less irregularly whitish ; nerves 

 brown, all the other characters nearly as in the g . 



A larger species than the next, and not so liable to vary. 

 Apparently not uncommon on alders. Mr. Douglas and I have 

 taken it at Greenwich in July. 



{To be continued^. 



