Rhynchola from Henderson^ Island. 055 



S II b f ;un . Pent A tomi^js. 

 Caiacanthus taili, sp. n. 



Head, pronotum, scutcUum, and corium resplendent 

 bronzy green ; lateral margins to jnotiotiini and two trans- 

 verse spots with dark centres near the anterior pronotal 

 margin, apex of scutellnm, claval margins, lateral and 

 apical margins and veins to corium, ochraceous ; membrane 

 bronzy bh\ck, tlie apical area much paler and bronzy brown ; 

 body beneath and k'gs pale ochraceous ; rostrum ochraceous, 

 its apex piceous ; antennre with the first and second joints 

 brownish ochraceous, remaining joints black ; basal joint 

 extending beyond apex of head, second, third, and fourth 

 joints slightly but regularly increasing in length, fifth almost 

 subequal in length to fourth, antenuit'evous tubercles visible 

 from above ; head obscurely transversely wrinkled, the 

 central lobe a little projecting beyond the lateral lobes ; pro- 

 notum finely transversely wrinkled and obscurely punctate, 

 the lateral margins acute and reflexed, their anterior angles 

 acutely shortly spinous ; scuteilum wrinkled and finely 

 punctate, tiie basal area moderately convex, beyond which is 

 a central longitudinal ridge not reaching apex, which just 

 extends over the base of membrane ; corium distinctly and 

 somewhat thickly punctate; counexivum exposed beyond 

 basal third of corium, ochraceous, with large blackish spots 

 at the segmental incisures ; membrane extending considerably 

 beyond the apex of the abdomen, veins numerous and simple ; 

 rostrum reaching the posterior cox» ; abdominal spine long, 

 its apex recurved, not quite reaching the anterior coxa; 

 anterior tibiae a little dilated, posterior tibine slightly curved. 

 Long. 20 to 23 mm. 



A peculiarity in this species, and one found also in several 

 other species of Caiacanthus, is in having the spiracles of 

 tlie basal ventral segment exposed, not hidden by the meta- 

 sternum. Tliis character, strictly applied, would locate tiiese 

 species in the Tessaratominre, but it has recently been shown 

 that this course is not of universal application. Thus in 1881 

 1 described the genus Delocephalns and on the exposure of 

 the spiracles placed it in the Tcssaratoniiiiai, for which 

 Horv^th proposed a distinct tribal division, Delocephalini, 

 and in which Schouteden described a second species. The 

 last-named writer has since, and I think correctly, transferred 

 the genus to the Phylloce})halina?. Another recent instance 

 is of a genus correctly placed by Westwood and Stal in the 

 Dinidorinje, and incorrectly transferred on these characters 

 alone by Bergroth to the Tessaratomiiia?. 

 L\ taili is allied to C. viridicaiuSj Dist. 



