The Annals and magazine of natural history; zoology, botany, and geology . d on the the base of the abdomen there are also three brown stripesabove the level of the lateral markings already described. Inthe more mature specimens these markings are more or lessobscured. Legs black. Pterostigma brown, more or lesscentred with yellow. 4 specimens, Aug. 26, Sept. 13, 21 (1899). Trithemis serva, sp. n. (Woodcut, fig. 1.) Long. corp. 34 millim.; exp. al. 57 millim.; long. | millim. Male.—Dull black, more or less varied with testaceous inimmature specimens, especially on the face
The Annals and magazine of natural history; zoology, botany, and geology . d on the the base of the abdomen there are also three brown stripesabove the level of the lateral markings already described. Inthe more mature specimens these markings are more or lessobscured. Legs black. Pterostigma brown, more or lesscentred with yellow. 4 specimens, Aug. 26, Sept. 13, 21 (1899). Trithemis serva, sp. n. (Woodcut, fig. 1.) Long. corp. 34 millim.; exp. al. 57 millim.; long. | millim. Male.—Dull black, more or less varied with testaceous inimmature specimens, especially on the face ; in the most 70 Mr. W. F. Kirby on Odonata from Sierra Leone. mature specimens the vertex is violet and the thorax pruinoseblue. The sides of the mentum are sometimes hyaline, with black nervures; fore wings with 11-13antenodal and 7-10 postnodai cioss-nervures; pterostigmadark brown, traversed by a narrow yellow line. Triangletraversed, followed by three rows of cells, increasing; sub-triangular space consisting of 3 cells : hind wings with 7-8 Fier. Trithemis serva. antenodal and 9-11 postnodai cross-nervures ; membranulewhite, stained with blackish ; a small yellow cloud beyond,sometimes obsolete, with its outer border straight, and abovethe lower basal cell, only visible at the extreme base. Ap-pendages of the second segment very prominent, the twohindermost converging like a pair of pincers. Described from six specimens, two of them taken byMr. Austen on Sept. 5 and 21 (1899). Allied to the East-Indian T. /estiva, Ramb., but easilydistinguished by the different shape of the markings at thebase of the hind wings and the form of the appendages of thesecond segment of the abdomen. It must also be allied toT. dichroa, Karsch, which seems to be a still darker colouredspecies in the male. Belothemis dorsalis. Libellula dorsalis, Eamb. Ins. N6vr. p. 89 (1842). Trithemis dorsalis, Kirb. Cat, Neur. Odon. p. 19. n. 16 (1890). Helotkemis dorsalis, Karsch, Berl. en
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