On the myriapods collected during the 'Skeat expedition' to the Malay peninsula, 1899-1900 / by F.G. Sinclair (formerly F.G. Heathcote).

  • F. G. Heathcote
Date:
1901
Catalogue details

Licence: In copyright

Credit: On the myriapods collected during the 'Skeat expedition' to the Malay peninsula, 1899-1900 / by F.G. Sinclair (formerly F.G. Heathcote). Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    tubercles ; the ridge and whole tergite wrinkled and rough. The ridge is not produced along the lateral margin. Posterior margin straight and without a row of tubercles, but, like the anterior margin, wrinkled and rough. Lateral margins somewhat rounded, and coming to a blunt point nearer to the anterior than the posterior margin. ^ncl tergite projects downward and forward ; point rounded. 3r<i tergite. Lateral margin nearly straight, forming an acute angle with the anterior and an obtuse with the posterior margin. 4th tergite more square, the anterior angle still rather obtuse. bth tergite. I^ateral margin still forms an acute angle with the anterior. The keel no longer points downward and forward, the keel arises high up so that the back is little convex. Qth tergite. The beginning of a shoulder appears. lih tergite. A distinct shoulder; the antero-lateral angle nearly square. The little teeth on the posterior margin of the keel can be observed in the 9th somite, but do not become conspicuous till the 13th. The posterior margin is never very much prolonged; it forms a short tooth but hardly a spine. The edge of the keel never becomes very distinctly lobed, though a trace of lobes can be observed in the posterior somites. The anterior angle of the keel only differs much from a right angle in the last four somites. The upper surface of the anal shield is marked with longitudinal ridges, as in PI. heccarii, but the arrangement is somewhat different. The sub-anal region shows the six tubercles along the line of the valves, but only three outside the valves; the absence of the third is probably an individual variation. Platyrhacus insiilaris Humbert & Saussure, var. nov. (Plate XXXI. figs. 40, 41, 47, 62, 53.) I believe this to be a variety of the species described by these authors, although it differs considerably from their description. Length 95 mm. Length of antennae 9|-; distance between bases of antennae 2 mm. mm. Width of 1st tergite 9 „ 2nd „ 11 „ 3rd „ 12 „ 5th „ 15 Colour dark chocolate-brown, shading into lighter brown on the edges of the keels. Ends of antennae rather darker than the bases. The extreme edge of the anal plate light-coloured. Beneath the keels, light near the edge, darker on the sides of the body ; sterna and bases of legs light chocolate-colour; ends of legs darker. Head covered with small smooth tubercles. Upper lip indented in the middle, and furnished with a row of six bristles. Just above the upper lip there is a triangular depression with three [12] mm. Width of 16th tergite 14| „ 17th „ 13 „ 18th „ 11
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