Gen. Theridium, Walck.
Theridium argentatum, sp. nov.
Fem. —Ceph.-th., long, 1.2; broad, 1. Abd., long, 2; broad, 1.6. Legs, 1, 2, 4, 3 = 7, 5.7, 4, 3 mm.
Cephalothorax fulvous, median band slightly mottled with dark olive-green, bifurcates from fovea, extends to posterior row of eyes; lateral borders mottled with similar tone; clathrate;
almost glabrous; ovate, lateral compression at caput moderate; cephalic part convex, ocular prominence well developed; clypeus nearly vertical, depth equals diameter of a fore-centre eye; thoracic part moderately dilated, fovea suboval, deep; radial striae somewhat shallow; caput grooves more strongly marked; profile-line ascends from thoracic junction at angle of 50°, slopes forwards with a perceptible curve.
Eyes do not differ much in size, fore-centrals smallest, hind-centrals largest of eight; posterior row sensibly pro-curved, median pair on black oval spots, rather more distant—barely an eye's breadth—from one another than they are from laterals; anterior row recurved, centre pair encircled by dark rings, separated from each other by a space visibly exceeding the diameter of an eye, and from side-eyes by a somewhat shorter interval; laterals posited on a tolerably strong, dark, tubercular prominence, subtouching.
Falces yellow-ochreous; conical, strongly convex, base projects beyond plane of clypeus, vertical, about twice as long as broad.
Maxillæ, fuscous base divided from bluish extremity by a yellow stripe; perceptibly longer than broad, dilated, obtusely pointed, inclined towards each other.
Labium dark chocolate-brown; subquadrate, more than twice as wide as long, margin tumid, everted.
Sternum, centre brown, fuscous margin; broad-ovate.
Legs light-brown; anterior pairs tolerably stout; armature fine hairs, few slender bristles.
Palpi yellowish, radial joint greenish, digital reddish-brown.
Abdomen inversely-oviform, laterally rugose; dorsum and sides studded with silver and golden contiguous flecks, former occur chiefly on median aspect; dorsal streak brown; two fore-thirds traversed by three somewhat arcuate bands of similar hue; posterior third dilates very abruptly into a wide quadrate band figured with a few golden dots, sub-border dark-brown; inferior half—rather more—of sides have a deep yellowish-brown tone, streaked with fine dark-brown lines. Ventral shield oval, normal brown, margin yellowish, sub-margin fuscous. Vulva blackish - lake, moderately convex elevation, transversely rugose, inferior margin beaded, somewhat pointed, dilated beneath into a moderately wide) (-shaped septum, separating two large, transverse, oval foveæ.
Single example, captured near Hawera. A. T. U.
Theridium albo-cinctum, sp. nov.
Fem.—Ceph.-th, long, 1.8; wide, 1.4. Abd., long, 2.3 wide, 1.7. Legs, 1, 2, 4, 3 = 8.7, 5.5, 5.1, 4 mm.
Cephalothorax orange-ochreous; sparsely haired on caput; oval, moderately constricted forwards, convex; cephalic part prominently rounded; clypeus vertical, height rather less than one-half facial space; thoracic fovea oval, longitudinal, deep; normal grooves well defined; profile-contour ascends from thoracic junction at an angle of 45°, slopes forwards with a sensible curve.
Eyes rather small, do not differ much in size, on dark rings; posterior row visibly procurved, median pair perceptibly further from laterals than they are from each other—an interval.exceeding their own diameter; anterior row recurved, centrals dark, largest of eight, form with hind-pair a nearly quadrilateral figure, narrowest behind; lateral eyes smallest, posited obliquely on moderate-sized lake-coloured tubercular eminences, contiguous.
Falces shade lighter than cephalothorax; sublinear, directed visibly forwards, barely project beyond plane of clypeus; stouter than the pars femoralis of a fore-leg, one-fourth longer than the cubital + radial joints of palpus.
Maxillæ pale stone-brown; acute-spathulate, inclined over labium, which has a broad-oval form, visibly everted; yellowish-orange.
Sternum light yellow-brown; broad-cordate.
Legs yellow-ochreous, orange reflections; tolerably stout; anterior pairs of nearly equal strength; fine, erect, dusky hairs; bristles long, sparse.
Palpi colour and armature of legs; pars cubitalis projects a long bristle.
Abdomen oviform, elongated; tolerably well clothed with hair; ground-colour light-brown, shade of olive-green, closely speckled with creamy-brown flecks; dorsal band of somewhat uniform breadth, tapers at either end, somewhat evanescent, irregularly notched; central part creamy-white, stained with chrome-yellow; encloses on fore-half three small greenish elongated marks. Corpus vulvæ moderately elevated, transversely rugose, projects forwards; displays a broad, ochraceous, dusky-bordered medial band, which terminates at a fair-sized amber-coloured depressed area, semicircular on inferior (anterior) side; superior subquadrate, projecting, gradually compressed in centre, margin beaded, brown; comprised within the area are two longitudinal oval foveæ, separated by a septum whose breadth is visibly narrower than their transverse diameter.
Single specimen, taken in the forest near Stratford. A. T. U.
Theridium ampliatum, sp. nov.
Mas.—Ceph.-th., long, 2; wide, 1.5. Abd., long, 1.88; wide, 1.8. Legs, 1, 2, 4, 3 = 13, 10.3, 9, 6.8 mm.
Cephalothoraæ orange - ochreous, reflecting reddish and metallic-orange fine, close radii; caput stripe wide, olivegreen, fades away towards eyes; broad-oval, sensibly compressed from hind-row of eyes; somewhat depressed; pars cephalica round-pointed, projects moderately overclypeus; latter vertical, plainly more than one-half depth of facial space; thoracic part rises into two somewhat prominent ridges, which slope rather abruptly to cephalic grooves; contour of profile inclined to stalk.
Hind-median and lateral eyes opalescent, of tolerable and nearly equal size; posterior row sensibly procurved, distributed at about equal distances, centre pair nearly an eye's interval apart; anterior row recurved, median pair on dark rings, smallest of eight by fully one-half, form with hind-pair a quadrilateral figure; removed from side-eyes by a space equalling their own diameter; laterals posited obliquely on a common lake-brown slight elevation.
Falces light brownish-ochreous; sublinear, retreating, scarcely one-fourth longer than clypeus; plainly stouter than the femur of a fore-leg.
Maxillæ colour of falces; short, of somewhat even width, round-pointed, curve over labium; latter organ ochraceous; large, broader than long, rounded, everted.
Sternum glossy, yellow amber-colour; cordate.
Legs creamy-ochreous, faint indications of olive-green central and distal annulations on femoral, tibial, and meta-tarsal joints; slender; armature fine, erect, dusky hairs; superior tarsal claws—first pair well curved, somewhat upright, 10 tolerably long open comb-teeth; inferior claw rather strong, sharply curved, 2 close teeth, fore-tooth longest.
Palpi and legs concolorous; pars humeralis linear, long, more than twice length of two following articles together; cubital joint somewhat oval; radial perceptibly the shortest, cup-shape, furnished with long dark hairs; digital joint well developed, nearly as long as humeral, viewed from outer side ovate; laminæ bulbi directed somewhat towards each other, ovate, exhibit a conspicuous dark-margined circular notch near extremity, outer side; hairs fine, rather sparse; genital bulb ovate, colour varies in shade from pale-straw to amber-colour. Of the rather complicated parts the following will most attract attention: basal end exhibits a large lake-brown fovea; a strong membranous apophysis runs parallel and in touch with lower border of clava, about its equal in length, margin somewhat incurved, apex slender, curved, yellowish; springing from about centre of upper border is a long, black, bristle-like apophysis following margin of bulbus backwards and forwards; immediately in front of base of the latter organ is a semi-pellucid apophysis somewhat ϩ-shaped, apex
ovate, hanging downwards, separated by a convoluted bulb from an articulated appendage of similar colour, but somewhat thicker, attached at both ends; a dark, triangular, acute process projects from extremity of bulbus.
Abdomen broad-ovate, depressed, projects moderately over cephalothorax; impressed spots deep, conspicuous, form a trapezoid narrowest in front; sparingly clothed with light and black coarse hairs projecting from yellowish spots; ground-colour light-yellowish olive-green—in fresh specimens probably light olive-green, figured with large and small creamy lobate flecks—resolved into streaks along basal margins of the unspotted dorsal band; dash of blue-black occurs on either side of medial band on basal third; posterior third is traversed by an interrupted chevron of similar colour, each half representing an acute-oval figure; one example exhibited two blackish spots forming a transverse line midway between the chevron and spinners.
Two examples, taken in the forest, Stratford. A. T. U.