AOEIDIODEA. 



205 



gross its. 



8. The rest of the anal nervures are closely associated with 

 one another at the base of the elytron. 



In the wing the costa is scarcely developed, and the 

 first branch of the sub-costa becomes the marginal 



o 



nervure. The medius appears to branch off from the 

 radius some distance from the base of the wing. 

 The dividing nervure is present. The second and 

 succeeding branches of the anal nervure occupy the 

 greater part of the wing-area. The wing is of less 

 importance for distinguishing species than the elytron. 

 The tendency to become rudimentary or abortive is 

 much greater in the wing than in the elytron. 



BRITISH SPECIES or ACEIDIODEA. 



A. Pronotum not extending beyond thorax ; 



a pad between the tarsal claws. 

 (a). Foveolae of vertex almost absent; 

 species large ..... 

 (l>). Foveolas of vertex well marked; 



species smaller. 

 (i). Antennae not clubbed. 



1. Tooth at base of valves of ovi- 



positor ; area between medius and 

 cubitus of elytron large, with 

 regular reticulation . 



2. No tooth at base ; less regular 



reticulation in a narrower area, 

 (a) . Costa unarched near base ; area 

 between costa and sub-costa 

 extending far beyond middle 

 of elytron. 



(i). Greenish; palpi coloured as 



face ..... 



(ii). Partly ruddy ; palpi white at 



tip . . . . . 0. rufipes. 

 (b). Costa arched near base; area 

 between costa and sub-costa 

 shorter. 



(i). Lateral carinae of pronotum 

 sharply angled . 



S. lineatus. 



0. viridulus. 



S. bicolor. 



(ii). Lateral carinae nearly 

 straight. 



