There appear to be several species confounded under the specific name of serratus. The one figured by our author is well distinguished by the colour of its rostrum and tibiæ, which are fulvous or orange-coloured. (Fabricius calls them yellow "flavis," and Burmeister red "rufis.") I have received this species from Valparaiso. Another species having brown tibiæ, of a narrower form, rather smaller than the preceding, and having fewer teeth upon the scutellar crest, is very abundant in Pennsylvania. It may be distinguished by the following character:-- Arilus denticulatus, _Westw._ fuscus, tibiis concoloribus, rostro antennisque obscurè rufescentibus cristâ scutellari circiter 10-denticulatâ. Long. Corp. 13 lin. Habitat in America septentrionali (Comm. Dom. Peale). The sting of these insects produced by the short and powerful proboscis is accompanied with very considerable pain. Mr. Smeathman informed Mr. Drury that he had been stung by the largest wasps of Africa, as well as by these bugs, and thought the pain inflicted by the latter much more severe, though the effect does not remain so long. The {74}pain is doubtless caused by that pungent volatile fluid which affects our smell so much when we catch those insects, with which they are abundantly supplied, and which they emit with considerable force. PLATE XXXVII. [Illustration] CICADA MACULATA. Plate XXXVII. fig. 1. ORDER: Hemiptera. SUBORDER: Homoptera. FAMILY: Cicadidæ. GENUS. CICADA, _Linn._ CICADA MACULATA. Atra, thorace elytris alisque flavo maculatis. (Expans. Alar. 3 unc. 9 lin.) SYN. Cicada maculata, _Drury_, _App. vol._ 2. _Germar in Silberm. Rev. Ent. Donovan Ins. China._ Tettigonia maculata, _Fabr. Ent. Syst._ 20. 12. _Syst. Rhyng._ 37. 18. HABITAT: China. _Upper Side._ Head black. Eyes yellow brown, round, and projecting from the head a little; between them are two small orange spots. Antennæ small and short. Thorax black, with four orange spots in a row, placed across it, and behind them two others. Abdomen black, consisting of seven annuli or rings, besides the tail part, the last of which is edged with orange. Anus orange-coloured, and furnished with a bristle for oviposition. Wings black, spotted, and streaked with orange; the anterior having a row of streaks along the external edges, and five distinct orange spots crossing the middle, near the shoulders: the posterior having a large orange patch on the abdominal edges, and a small round spot above it, with five small fainter ones placed along the external edges. _Under Side._ Head black, terminating in a long slender beak, which extends between the legs, to the abdomen; two small orange spots are placed just below the eyes. Thorax with an orange spot on each side. Legs and abdomen black; the latter having six orange spots, three on each side. Wings as on the upper side.