Leptobasis yanomami, DeMarmels, 1992

DeMarmels, Jurg, 1992, Dragonflies (Odonata) From The Sierras Of Tapirapeco And Unturan, In The Extreme South Of Venezuela, Acta Biologica Venezuelica 14 (1), pp. 57-78 : 62-63

Leptobasis yanomami sp.n.

Figures 31-35

Male (holotype). Venezuela, Amazonas Federal Territory, upper Rio Mavaca, 160 m, 02°02'10"N. 65°06'50"W, 14 Feb - 6 Mar 1989, J. DeMarmels leg .

Material. 2♂, 1♀, including holotype and paratypes; all with same data .

Male (holotype). Labium pale; labrum dark green; top of head black, a small rounded blue postocular spot on each side; a rufous transverse band across head between postocular spots and rear of head, which is pale. Antennae dark brown. Compound eyes in life dark green above, vivid grass green below. Anterior lobe of pronotum ru· fous laterally, blue dorsally in the middle; me· dian lobe rufous above, bright blue laterally; pos' terior lobe brown, its hind margin trilobate with the middle lobe about as broad as both lateral lobes taken together. Each mesepisternum with a rounded tubercle behind mesostigmal laminae, close to median carina. Color of pterothorax strongly rufous with vivid blue stripes as follows: a complete antehumeral stripe closely paralleling humeral suture, a somewhat broader stripe over proximal half of metepisternum and lower angle of mesinfraepisternum, an ill-defined stripe along distal margin of metepimeron; the latter otherwise creamy to bluish white. Legs pale, dark brown tibial spines shorter than intervening spaces. Wings hyaline, venation dark brown; pterostigrna rufous, shorter than underlying cell and with the four sides about equal in length. Anal vein branching from wing margin as far after cux as this latter is long. Three antenodal cells in the discoidal field (two in right fore wing) 11 px in fore wings, 10 in hind wings. R3 rising from or after fifth px; IR2 from eighth or ninth px in fore wings. In hind wings R3 branching after the fourth px; IR2 as in fore wings. Abdomen chiefly brown dorsally, darker at tips of segments 3-6. Segments 1.3 laterally blue, segments 7-10 entirely rufous and laterally slightly expanded. Anal appendages rufous, shaped as in Figs. 31 and 32 .

Measurements. Total length (incl. appendages) 36.5: abdomen 30.5; hind wing 17.5.

The male paratype resembles the holotype, but has 12 px in the fore wings. RJ rises from the sixth px in the fore wings, from the fifth in the hind wings. Penis as illustrated in Figs. 33 and 34 .

Female (paratype). Top of head and labrum rufous, otherwise as male. Hind lobe of pronotum trilobate, but considerably different from male ( Fig. 35 ). Wings similar to male paratype. Eighth abdominal segment with ventral spine; ovipositor slightly surpassing end of segment 10.

Measurements. Total length 38.0; abdomen 31.5; hind wing 19.0.

Remarks. Leptobasis yanomami comes closest to L. mammilaris Calvert, but differs from it in the shape of the male anal appendages and the female prothoracic hind lobe. The latter is illustrated for L. mammilaris in Fig. 36 . The female attributed to L. mammilaris by Calvert (1909) is doubtless not that species. All specimens were taken in the forest on sun-hit bushes, away from water. The specific name chosen refers to the Indian tribe of the "Yanomami" which settles in this South Venezuelan region.

Figures

Plate V: Figures 31-35. Leptobasis yanomami sp.n. (31) abdominal segment 10 with anal appendages, holotype male, left lateral view; (32) same, dorsal view; (33) penis, paratype, left lateral view; (34) same, ventral view; (35) hind margin of pronotum, paratype female, dorsal view. Figure 36. Leptobasis mammiiuris, female (Venezuela, Bolivar, Canaima), hind margin of pronotum, dorsal view. Figures 37-40. Metaieptobasis fernandezi. (37) female, hind margin of pronotum, dorsal view; (38) male, abdominal segment 10 with anal appendages, dorsal view; (39) same, left lateral view; (40) male, left mesothoracic horn, left lateral view. Figures 41-45. Metaleptobasis mauritia (41) male (Trinidad, Valencia), abdominal sEgment 10 with anal appendages, dorsal view; (42) same, left lateral view; (43) left mesothoracic horn, left lateral view; (44) female (Venezuela, Amazonas, San Juan de Manapiare), hind margin of pronotum, dorsal view; (45) left mesothoracic horn, left lateral view, same specimen. Figure 46. Metaleptobasis manicaria, female (Venezuela, Delta Amacuro, Jotacuay), hind margin of pronotum, dorsal view.