4 [January, 



16 (7) Base of thorax with a longitudinal impi-ession on each side opposite 



the fovirth row of elytral punctures. 



17 (30) Head, in greater part, pale. Thoracic impression not falcate nor 



reaching the half-lengtli of the thorax. Metasternum simple. . 



18 (25) Elytra with tlie dark lines 1 — 4 unequal in width distinctly widened 



on the disc, 5 — 7 interrupted at the base, in the middle, and at the 

 apex, and often confluent. 



19 (24) Thorax apparently more than twice as broad as long, the sides strongly 



convergent in front. Elytra evidently widest before the middle. 



20 (23) Elytral interstices in the female, wholly or in part, with an extremely 



fine irrorate pixnctulation. 



21 (22) Elytral interstices in the female punctulate throughout. Usvially a 



little larger than hcydeni and much less rapidly narrowed behind. 

 Inner claw on front tarsi of male about two-thirds as long as the 

 outer, wider and moi-e strongly curved ruficollis, De Geer. 



22 (21) Elytral interstices in the female punctulate across the apex and some- 



times along the distal half of the suture. Simihir to ruficollis, but 

 scarcely so wide at the shoulders and more gradually narrowed 

 behind, dark red-yellow in colour with the black markings on the 

 elytra more pronounced .fulvicollis, Er. 



23 (20) Elytral interstices in the female without punctulation. Generally 



smaller than ruficollis, comparatively wider at the shoulders and 

 more rapidly narrowed behind. Claws on front tarsi of male sub- 

 similar heydeni, Wehncke. 



24 (19) Thorax not more than twice as broad as long, the sides moderately 



convergent in front. Elytra widest in the middle, with an oblique 

 pale band from the shoulder to the suture, followed by another 

 oblique band of approximately eqxxal width bxxt composed of short, 

 black longitudinal lines fluviatilis, Aube. 



25 (18) Elytra with the dark lines 1 — 4 of uniform width throughout, 5 — 7 



less decidedly, or not at all, internxpted. 



26 (27) Sides of elytra xxsxxally sxxbparallel, as in H lincatocollis. Elytral 



interstices of female pxxnctxxlate throxxghoxxt. Left side-lobe of 

 cedeagxxs sxxbfalcate, withoxxt a fringe on its concave edge.... 



striatus, Shai'p. 



27 (26) Sides of elytra continxxoixsly cxxrved. 



28 (29) Elytral interstices of female pxxnctxxlate on the apical half, the 



pxxxictxxlation liecoming gi-adxxally evanescent aboxxt the nxiddle. 

 Left side-lobe of ajdoagxxs with a fringe of long, more or less 

 coherent, hair-like strips of delicate membrane oix tlxe distal half of 

 its concave edge. Jildeagxxs obtxxsely roxxnded at tlie aj^ex with a 

 subrectangxxlar projection near the apical third of its convex edge... 



tvehnckei, Gerh. 



