When full fed, the larva spins a thick cocoon of silk, which is attached to the sides of the cell; the outer coating of this cocoon is of a coarser and browner silk than the interior, which is formed of very delicate threads of a slaty-whitish colour and of a close texture, and which is as lustrous as satin. The exact period of their evolution from this state is not recorded, but it is probable that they pass the winter enveloped in their cocoon as pupæ, and in their season come forth the following year. ------- Genus 20. ANTHIDIUM, _Fabricius_. (Plate XIII. fig. 1 ♂♀.) _Apis_ ** _c_ 2 _β_, Kirby. _Gen. Char._: BODY subglabrous. HEAD transverse, as wide as the thorax; _ocelli_ in a triangle on the vertex, which is flat; _antennæ_ shortish, slender, filiform, subgeniculated; the _scape_ stouter than the flagellum, subclavate, first joint of flagellum globose, the remainder subequal; _face_ flat; _clypeus_ triangular, truncated at its base, slightly rounded in front and convex; _labrum_ longitudinally oblong, the sides parallel and concavo-convex; _mandibles_ dilated at the apex, where they are quinque-dentate; the _alternate teeth_ smallest; _cibarial apparatus_ long; _tongue_ very long, tapering to its extremity; _paraglossæ_ very short, one-sixth the length of the tongue, coadunate at the base and subhastate; _labial palpi_ more than half the length of the tongue, the two first joints very long, the second the longest, and both tapering to the acute extremity of this, where, just before its apex, the third very short subclavate joint articulates with the still shorter terminal joint conterminous with it; _labium_ one-third the length of the tongue, its inosculation with an acute projection in the centre; _maxillæ_ as long as the tongue, subhastate and acuminate; _maxillary palpi_ springing from a deep sinus at its base, very short, two-jointed, the basal joint the shortest, and the second obtuse one terminating with a few rigid setæ. THORAX subglobose; _prothorax_ inconspicuous; _mesathorax_ slightly convex, wing-scales large; _scutellum_ lunulate, projecting and impending over the metathorax, which is truncated; _wings_ with two submarginal cells, and a third indistinctly commenced, the second slightly the longest, and receiving the two recurrent nervures one at each extremity; _legs_ moderate, subsetose, the tibiæ fimbriated along the edges, the anterior _spurs_ slightly palmated; the _plantæ_ of the four anterior pairs longer than their tibiæ, but those of the posterior not quite so long, and all densely clothed all round with a brush of short close hair; the _claws_ distinctly bifid. ABDOMEN semicircular, very convex; the base truncated and hollowed to fit the metathorax; the _segments_ slightly constricted, the _terminal segment_ transversely concave, and its apex terminating in three slight angles; the _venter_, which is flat, is