108 Mr. James Edwards' Synopsis of 



4. Crown, pronotum, scutellum, and base of the clavns widely, 



greenish yellow. Eytra pale yellow-brown, a large ill-defined 

 blotch in the middle and another before the apex white. 



5. Closely resembling female alni in the coloration of the elytra. 

 Length, 5 — 6 mm. 



Abundant on birch. 



iii. Pediopsis, Bunn. (PI. II., fig. 6). 



Burmeister, Genera Insectorum, IG (1838). 



Distinguished from its alHcs by the direction of the 

 sculpture of the pronotum. This genus as here limited 

 comprises two very natural groups, one consisting of 

 wide species with the crown less angular and the face 

 convex with its upper margin widely rounded, as in tilue, 

 scatellatas, &c., and the other comprising our remaining 

 species, which are narrower and more pointed in front, 

 and have the face flat and rhomboidal in shape. The 

 full complement of black markings on the face of those 

 species which have spotted faces is nine, placed as 

 follows : a pair of moderate size near the upper margin 

 with a dissimilar one between them, a small round one 

 at each ocellus, a large subtriangular or comma- shaped 

 pair just above the clypeus, and between the bases of 

 these a minute punctiform pair. These markings occur 

 in various combinations in different species, and, not- 

 withstanding their liability to vary within certain limits, 

 sometimes afford useful aids to identification. 



Table of Species. 



1 (2). Crown linear, scarcely visible from above . . 1. tilicc. 



2 (1). Crown distinctly visible from above. 



3 (8). Front margin of crown rounded or scarcely 



angular in front. Face distinctly convex. 



4 (5). Elytra lacteo-byaline .. .. .. . . 2. nanus. 



5 (4). Elytra hyaline with a brownish yellow tinge, 



nerves dark brown or black. 

 G (7). Inner side of hind tibiae pale throughout . . 3. scutcUatu^ 



7 (G). Inner side of hind tibias with two short black 



streaks, one near the base, the other just 



before the apex . . . . . . . . -1. tibialis. 



8 (3). Front margin of crown nearly rectangular. 



Face flat. 



