1883.] 115 



Id. albicans, Kbm. — Fieber, without reason, puts this species as 

 a synonym of covfusus, Flor, and most subsequent writers have 

 followed him. It is, however, abundantly distinct. 



1 (2) First and second apical areas of elytra sub-equal in lengtli, i. e., their bases 



level, or nearly so adustus,^.-^. 



2 (1) First apical area much longer than second. 



3 (4) First subapical area triangular, or 5-sided, reaching the coatQ,...varius,Y. 



4 (3) „ „ „ parallel-sided, not „ „ „ 



5 (6) Cheeks pubescent, more conspicuously in the J Serrichii,'K.hra. 



6 (5) „ bare. 



7 (12) Elytra brownish, with a pale transverse band or bands. 



8 (9) „ with two pale transverse bands tremzil<B,'EBt\. 



9 (8) „ „ one „ „ band. 



10 (11) First sub-apical area well defined, about one-third shorter than the second. 



elegans, Flor. 



11 (10) First subapical area not well defined, about half as long as the second... 



laminatus, Flor. 



12 (7) Elytra without pale transverse bands. 



13 (18) Anal nerve standing in an oval white patch at apex. 



14 (15) Inner cubital and brachial nerves with a short black streak reaching as far 



as the apex of the clavus. First transverse nerve black . . 



lituratus, Fall. 



15 (14) Nerves chequered with black, or rust colour, and white. First transverse 



nerve white. 



16 (17) Pronotum with a broad pale stripe. Face with four broad bla«k stripes, $ , 



or only two (on the frons), ? paecilus,'K.-B. 



17 (16) Pronotal stripe not so broad, nor so well defined. Face without distinct 



dark stripes in either sex tibialis, Fieb., = Heydenii, Kbm. 



18 (13) Anal nerve white al apex, but not standing in an oval white patch, or nerves 



entirely white. 



19 (22) Brachial nerve with a white streak near the apex. 



20 (21) First transverse nerve white vitreus, Y&h.,^ H. album, Fieb. 



21 (20) „ „ „ not white , aurulentus,^\)xa. 



22 (19) Brachial nerve not marked with white. 



23 (28) Elytra green or greenish-grey, more or less tinged with reddish-brown to- 



wards the suture. 



24 (25) Side margins of face angularly indented below the eyes. Inhabits poplars. 



fidgidus, F. 



25 (24) „ „ „ „ at most faintly sinuate. 



26 (27) i . Face and legs generally much suffused with orange-yellow. ? . About 



one-sixth of visible length of ovipositor projecting. Inhabits aspen... 



populi, Lin. 



27 (26) <? . Without orange coloration. ?. About one-third of visible length of 



ovipositor projecting. Inhabits sallow confusus, Flor. 



28 (23) Elytra greenish-white, or almost milk-white. Nerves entirely white. In- 



habits white poplar albicans, Kbm. 



Swiss Cottage, Rupert Street, Norwich : 

 ISth September, 1883. 



