240 [Marcl!,1874. 



frons, adjoining eacli eye, is a short, oblong, black spot ; space between the 

 ocelli, fuscous. Face with a longitudinal black streak on each side of the 

 centre. Lorce and cheeks yellow, margined with black. Antenna and sctcn 

 pale yellow ; apical plate elongate-oval, black, basal third white. Ocelli black. 

 nostrum black, clothed with short golden hairs. 



Thorax : pronohim black ; posterior and side margins narrowly and a broad, longitu- 

 dinal, central line yellowish-white ; disc — the trapezoid patches more or less 

 marbled with yellowish-white in the middle, and near the inner posterior angle 

 with a small, distinct, yellowish-white spot. Scutellum yellow ; middle of the 

 basal margin and basal angles with a triangular black spot, and to the apex of 

 the latter is hooked on a small round spot of the same colour ; from the trans- 

 verse channel towards the apex is a short black streak on each side of the centre. 

 Elytra clear, transparent, shining. Clavus with an almost round pale yellowish- 

 white spot, encircling the yellow apex of the central nerve ; scutellar margin 

 narrowly black, from thence to the inner edge of the pale spot broadly black ; 

 inner nerve yellow, base and apex black ; central nerve yellow ; at the base, 

 interiorly, with a narrow black margin, and two short black streaks placed one 

 opposite that on the inner nerve, the other adjoining the inner edge of the pale 

 round spot ; base, between the central nerve and claval suture, with a yellow 

 triangular patch ; claval suture black ; apex, for some distance, and two or 

 three short, oblong spots, yellow. Corium — inner longitudinal nerve black ; 

 apex, for some distance, and three short streaks, yellowish-white, two of which 

 are between the base and transverse nerve ; 2nd nerve, from the base to beyond 

 the bifurcation, black ; inner neiwe of the bifurcation yellow, except the. base, 

 apex, a streak beyond the transverse nerve, and four or five minute spots 

 before the latter, which are black ; outer nerve of the bifurcation black, with 

 three yellowish-white streaks before reaching the transverse nerve, and another 

 (the longest) beyond the latter ; 1st transverse nerve black. Membrane — nerves 

 black. Wings clear, transparent, very iridiscent ; nerves fuscous-black. Sternum 

 black. Ziegs black ; thighs — 1st and 2nd pairs yellow, with a broad, black, 

 longitudinal streak oii the upper- and under-sides ; 3rd black, base narrowly, 

 and upper and lower margin at the apex, yellow. Tibia yellow, all the pairs 

 with the iisual black spot, exteriorly, at the base ; inner and outer margin of 

 the Ist and 2nd pairs narrowly black ; 3rd above, black, spines brown ; next 

 the spines, and under-side, more or less yellow. Tarsi yellow ; base of the 1st 

 joint of the 3rd pair narrowly, and apex of all the joints, fuscous. Claws black. 



Abdomen black, posterior margin of the segments beneath narrowly yellow ; last 

 genital segment at the apex, on the under-side, yellowish-white. 



Length, 2 lines. 



This insect belongs to the same gronp as I. lituratus and /. varlus. 

 From the former it may at once be distinguished by the absence of 

 the orange coloured anterior margin and granulated nerves of the 

 elytra ; from the latter by the want of the three black streaks on the 

 anterior margin of the elytra ; and from both by the more frequent 

 pale spotting of the nerves. It stands nearest to I. varius, which 

 species I have sunk (at present) as not British, because all the exam- 

 ples I have seen representing it are only /. adustus, Il.-Sch. 



