On a collection of dragonflies made by members of the 'Skeat expedition' in the Malay peninsula in 1899-1900. Pt. II / by F.F. Laidlaw.

  • Laidlaw, Frank Fortescue, 1876-1963.
Date:
1902
Catalogue details

Licence: In copyright

Credit: On a collection of dragonflies made by members of the 'Skeat expedition' in the Malay peninsula in 1899-1900. Pt. II / by F.F. Laidlaw. 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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    A very beautiful and striking species. I believe that the female has not as yet been devscribed; it differs markedly from the male and is fully as brightly coloured. I append a short description of it;— $ . Head, prothorax, and thorax nearly as in the male, the yellow rather less vivid, and the black stripes on the upper lip and epistome continuous with the black markings near the base of the antennae. The abdomen is chestnut-brown above, but the first segment is yellowish green. Segments 2-6 each with a black apical ring feebly developed on the second segment. Immediately before the apical ring there is on each of these segments a dorsal yellowish- green mark, extending forward in 2-3 for about one-half, and in 4-6 for about one-third, of the total length of the segment. This mark is divided longitudinally in each segment by a thin brown line on the mid-dorsal carina. In segments 3-6 the black apical ring sends forward on either side of the segment a black line, extending nearly the whole length of the segment. In the seventh segment the anterior half is black, and the yellowish-green marking here is divided into two parts, well separated from each other and diverging posteriorly, the space between them being occupied by a triangular extension forward from the apical ring, which also sends forward, as in the preceding segments, a lateral mark on either side. Segment 8 is black dorsally, with a yellowish-green band either side, and beyond these again black lateral lines. Segments 9-10 are black, 9 with a small and 10 with a minute pair of yellowish spots. Under surfaces yellowish bi-own. Appendages short, yellow, with black tips. Length of abdomen 30 mm,, of hind wing 24 mm. Several pairs from a stream near Kwala Aring. Legion Protone era. Protosticta foersteri, sp. n. One female from Gunong Inas, Perak. Lower lip rounded, with short lobes. A small supplementary basal postcostal nerve present, lying at a level between the base of the wings and the fiist antenodal costal nerve. Pterostigma trapezoid, dark bi'own in colour, surmounting a single cell, its anterior margin shorter than its posterior; followed by a single row of cells. Sectors of tlie ai-culus united fi‘om their commence- ment for a short distance. Upper sector of the quadrilateral ending against the hind margin of the fore wing at the level of the first postnodal costal nerve; that of the hind wing one cell lower. No trace of the lower sector of the quadrilatei'al. The median sector starts from the nodal vein, the subnodal a little beyond it. Head black ; upper lip and i-hinarium bluish white, the former with a black margin ; antenna^ yellowish.