30 



external edges darker. A pale pearl-coloured bar runs across the wing beyond the middle, widening 

 gradually ; below this are some veiy faint brown spots, and near the external edge some faint orange 

 ones, scarcely visible. The edges of all the wings are entire. 



The genus Castnia is another of those curious anomalous forms, which exhibit the 

 characters of several groups. The general form of the wings is that of a moth, whilst the 

 variegated colours, indicating diurnal flight, and the structure of the antennae are those of 

 a butterfly. It is much to be regretted, that travellers in South America have not 

 ascertained the preparatory states of this extraordinary group, which alone will enable us 

 satisfactorily to ascertain its real relations. 



GASTROPACHA? OTUS. 



Plato XVI. fig. 3. 



Ordeu: Lepidoptera. Section; Nocturna. Family: Bombycidae, Steph. 

 Genos. GdSTROPACHA ? OcAsch/i. Sphiux, Drury. 



Gastropacha? Oths. Alis elongatis integris luteo-fuscis, antieis fasciis duabus denticulatis nigris. (Expans. 

 Alar. 4 unc. G lin.) 



Syn. Sphinx Otus. Drury, Append, v. 2. 



Bombyx Agrius, Olio. Enc. MUh. 5. 39. 56. 



Habitat; Smynia. (Drury). 



Upper Side. The antennae and head are of a redcUsh brown ; the fomier are strongly pectinated, 

 and very broad in the middle, but at the extremities very narrow and curled. Thorax dark brown. 

 Abdomen reaching half an inch below the wings of a reddish dun colour. Anterior wings dun colour; 

 with a large spot or patch, of a darker colour, situated on the posterior margin, near the base. Two 

 indented black lines run obliquely from the anterior edge, near the tip, to the posterior near the middle ; 

 the space between them being rather lighter than the rest. Posterior wings dun colour, immaculate. 

 All the wings, both on the under and upper sides, appear very shining and glossy ; the scales or feathers 

 appearing, when viewed through a microscope, very coarse and long. There is no tongue discoverable 

 in this moth. 



Under Side. Breast and sides bright dun. The abdomen reddish dun. All the wings dun-coloured. 

 The lower indented line appears faintly through the wing, of a dark brown colour, also a faint reddish 

 brown indented line runs across the posterior wings. The edges of all the wings are entire. 



This insect, which appears to have been overlooked by modern authors, seems to form a 

 connecting link between Zeuzera and Gastropacha, agreeing with the former in the general 

 form, and with the latter in the transverse denticulated fasciae on the anterior wings, 

 and the curved antennae feathered to the tips. 



