EUSEMIA GLOSSATRIX, Westw. Alis supra nigris, purpureo-nitidis, præsertim in alis posticis; anticis fascia media parum curvata tripartita straminea, alteraque inter medium et apicem alæ e punctis 4 albis formata, interstitiis squamis argenteis perpaucis ornatis; alis posticis margine postico albo, intus dentato; abdomine supra nigro, subtus fulvo; collare et pedibus subtus fulvis. Expans. alar. antic. unc. 2¼. Habitat in Afric. orient-merid. In Mus. Hopeiano. Family SATURNIIDÆ. This splendid family is well represented in Africa, particularly in the south-eastern portion, where a number of beautiful species have been found, especially in Natal. A monograph of these insects, so far as then known, was published by myself in the “Proceedings of the Zoological Society,” in 1849 (with four coloured plates containing thirty-three species), of which half were previously undescribed. Of these, perhaps the most striking is the long-tailed species _Actias mimosæ_, with pale green wings, which lives upon the Mimosa, on the banks of the river Tugela, the boundary of the kingdom of Amazulu, between Delagoa Bay and Natal, the cocoons of which are used by the natives for tobacco boxes. Another fine species is _Saturnia Alcinoë_, Cramer, pl. 322, fig. A, (= _S. Caffraria_, Stoll, pl. 31, f. 2, _S. caffra_, Boisduval in Delegorgue’s Voy. Afr. Austr. ii. p. 601). A specimen of this species, measuring seven inches in the expansion of the fore wings, was taken by Mr. Oates, but the precise locality was not recorded. Another species, which appears to be undescribed, was also taken by Mr. Oates, which may be thus characterized:-- SATURNIA CERVINA, Westw. Tota roseo-cervina, alis anticis spatio minuto transverso squamis destituta ad apicem cellulæ, striolaque paullo obscuriori paullo curvata et vix distincta inter cellulam et marginem posticum; alis posticis macula parva trigona ad apicem cellulæ; abdomine magis fulvo; alis anticis apice subrotundatis. Expans. alar. antic. unc. 4⅔. Habitat prope Tati. A beautiful species, nearly allied to the European emperor moth, was taken by Mr. Oates, which appears to be undescribed, although it has been named by Mr. Butler, in manuscript, in the British Museum collection:-- SATURNIA FLAVIDA. _S. Apolloniæ_, Cramer, pl. 250, fig. A, persimilis; differt colore fusco-griseo alarum flavido-tincto, fascia fusca pone ocellum, absque maculis duabus nigricantibus subapicalibus, colore fusco subapicali omnium alarum intus flavido latius marginato. Expans. alar. antic. unc. 3⅓. Habitat prope Gubuleweyo. I take this opportunity of describing two additional species of _Saturnia_, closely allied to _S. flavida_, in the Hopeian collection, together with a remarkable species collected by Mr. Buxton:-- SATURNIA TERPSICHORINA, Westw.