Volume I Part 4 (2/2)

_Variable Strombus--upper figure._

_S. testa nodose plicata, spira striis nullis; labio interiore simplice, exteriore reflecto, intra laevi, supra leviter lobato._

Sh.e.l.l with nodulous plaits, the spire not striated. Inner lip simple.

Outer lip reflected, smooth within, and slightly lobed above.

Sh.e.l.l two inches and a quarter long, the spire occupying little more than half an inch. The ground colour generally is white with numerous undulated short lines of a darker colour, sometimes crossed by four or five obsolete whitish bands: it approaches very near _S. minimus_, but is easily distinguished by being in general much larger, by having the inner lip not at all thickened above, the outer lip very slightly lobed, and only advancing on the first volution of the spire: it varies, however, amazingly in colour. There is a small variety, having a brown spot beneath, from India; and others (labelled from the So. Seas) in the Banksian collection, also small, are purplish-brown, with three or four well-defined bands of white: the aperture is always pure white.

Pl. 11

[Ill.u.s.tration]

DRUSILLA Horsfieldii.

GENERIC CHARACTER.

_Antennae mediocres, clava producta, gracili, cylindracea. Palpi breves, compressissimi, obtusi, remoti, linguam non attingentes; lateribus utrisque hirsutissimis, articulos obtegentibus. Abdomen (in maribus) 7-articulatum: 1mo longissimo, ultimo simplici, truncato, supra integro, subtus unco incurvato, valvis nullis. Alae anticae (in maribus) basi postica dilatatae, fasciculum in alas posticas obtegentes._

(OBS. _Alae integerrimae, subdiaphanae, posticae magnae, orbiculares. Pedes antici spurii; antennarum articuli basales ad apicem incra.s.sati._)

Typus Genericus _Papilio Jairus_. Fabr.

Antennae moderate, the club lengthened, slender, cylindric. Palpi short, much compressed, obtuse, remote, not touching the tongue, covered equally on both sides with thickset hairs concealing the joints.

Abdomen (in the male) 7-jointed, the first very long, the last simple, truncate, and entire above, without valves, and with an incurved hook beneath. Anterior wings (in the male) dilated at the posterior base, concealing a tuft of hair on the inferior wings.

Generic Type _Papilio Jairus_. Fabr.

(OBS. Wings very entire, sub-diaphanous. Hinder wings large, orbicular.

Fore-legs spurious. Basal articulations of the antennae thickened at the end.)

SPECIFIC CHARACTER.

_D. alis anticis angustatis, fuscis, concoloribus; margine posteriore et exteriore aequalibus: posticis albidis; margine exteriore fusco, supra uni-ocellato, subtus bi-ocellato._

Wings, anterior, narrowed, the posterior and exterior margins equal, uniform brown; posterior cream-coloured, with a brown margin, one ocellate spot above, and two beneath.

This new and elegant insect was discovered by my worthy friend Dr.

Horsfield (after whom I have named it) in the interior of Java: it forms a part of the extensive collections made there by this zealous naturalist for the East India Company, and which will make a most important addition to our present confined knowledge of the productions of that interesting island: indeed these collections exceed in extent, preservation, and value, any which have been brought to this country.

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