A lovely insect, which is unfigured, and, as far as we can ascertain, undescribed by any author. It appertains to the Linnaean genus _Sphinx_, which can be viewed (from the immense diversity and great number of the species) only as a family containing many and striking natural genera: in modern arrangement it is most nearly allied to the _Sesiae_ of Fabricius, from which, as it strikingly differs in the formation of the palpi and antennae, I have separated it. I have named this insect to commemorate the exertions of Mr. Abbott, well known as having furnished the materials for that beautiful work the Lepidopterous Insects of Georgia, edited by Sir James Edward Smith. And from the unpublished drawings of this zealous collector, the larva and pupa have been figured. Mr. Abbott writes that it is a rare species in Georgia, and feeds on the grape. The female differs not in colour from the male, which is here represented. * * * * * Pl. 61 [Illustration] TAMYRIS Nurscia. * * * * * GENERIC CHARACTER.--See Pl. 33. * * * * * SPECIFIC CHARACTER. _T. alis nigris, anticis supra fascia centrali rufescente, infra punctis duobus ad basim albidis; posticis infra caesiis, cinereis, basi nigris linea obsoleta albida; margine nigro._ Wings black; anterior above with a central reddish band, and two white basal dots beneath; posterior beneath grey and cinereous; base black with an obsolete white line; margin black. * * * * * The marginal fringe of the lower wings in this species has a few white dots between the nerves, and the upper surface is sprinkled or powdered in the middle with blueish-green atoms; on the under surface of the anterior wings the lower part of the band is orange, the upper bright rufous; and within the black margin of the posterior wings is a large blueish spot, and two or three whitish dots on the sides of the thorax. It seems nearest allied to _Hesp. Celsus_ of Fabricius, which is only slightly described from Mr. Jones's unpublished drawings. * * * * * TAMYRIS Laonome._--lower figure._ * * * * * SPECIFIC CHARACTER. _T. alis utrinque similibus, concoloribus fuscis, margine communi aurantiacis; capite anoque rubris._ Wings in both sexes alike, uniform brown, with a common margin of orange; head and tail red. * * * * * The under surface of this insect (a female) perfectly resembles the upper: it will approach near to _Hesp. Amiatus_ of Fabricius, which no doubt belongs to this genus. For both these interesting insects, not to be found in Fabricius, I am indebted to the liberality of my friend Professor Klug, Director of the Royal Museum at Berlin: no note accompanied them, I therefore conclude they are undescribed, and probably inhabiting South America.