OCR Text |
Show 520 MR. M. JACOBY ON NEW COLEOPTERA. [June 5, spots placed triangularly near the apex, and sometimes connected with each other, and another round spot in the middle, near the subsutural stripe. Entire underside and legs shining greenish black. The abdominal segments punctate and thinly pubescent at their base. Length 4 lines. Hab. Costa Rica. Collection Jacoby. GALLERUCI D^E. Genus MONOCESTA, Clark. 18. MONOCESTA DIMIDIATA, sp. nov. Subelongate, ovate, much dilated posteriorly, anterior half reddish brown, posterior black; head sparingly and obsoletely striate, with a distinct longitudinal impressed line through its entire length, and a deep transverse groove between the eyes, brown, shining; antennse nearly half the length of the body, black, with the exception of the first joint, which is reddish fulvous ; thorax transverse, a little narrowed in the middle, broadly emarginate near the anterior angles, with a deep oblique depression on each side towards the middle, shining reddish brown, closely but very obsoletely punctured, the disk nearly smooth ; scutellum finely punctuate, very rounded at the apex. Elytra greatly dilated almost from the base to behind their middle, impressed below the shoulder near the lateral margin, and narrowly margined, apex simple, extremely close and finely punctured throughout, reddish brown at their anterior half, black from there to the apex. Anterior part of the underside fulvous, part of breast, entire abdominal segments and legs (with the exception of the first two pairs of the anterior thighs, which are fulvous) black. Length 7 lines. Hab. Peru. In m y collection. 19. MONOCESTA NICARAGUENSIS, sp. nov. Broadly ovate, rufo-fulvous, pubescent. Head and vertex impressed with a longitudinal groove, minutely punctate and sparingly pubescent, labrum and mandibular darker; antennae black. Thorax much narrowed in the middle, the apex slightly wider than the base and rounded ; surface irregularly and transversely impressed, sparingly pubescent. Elytra broadly margined, much dilated posteriorly, the punctuation scarcely visible, and covered everywhere with rather long reddish brown hair. Body below, together with the tibiae, fuscous, anterior pair of thighs fulvous. Length 5 lines. Hab. Chontales, Nicaragua. Collected by Mr. Janson. Among the posteriorly dilated species of this genus, the present one will be recognized by the uniform coloration of the entire upper surface, the rather long pubescence, and the colour of the antenna", all of which are exactly the same in all the specimens before me. |