Lygistorrhina borkenti (after Huerta & Ibáñez-Bernal, 2008)
Abdomen of male with basal pale yellow bands on tergites 2–4, tergites 1 and 5–7 dark brown;antennae dark; flagellum length 1.10; coxae dark; hind femur with basal half pale yellow, apical half darkbrown; hind tibia basal half pale yellow, apical half dark brown; wing length 3.84; aedeagal complex membra-nous and rounded.
A species with apical darker spot of the wing, that is distinguished from all other New Worldspecies by the following combination of characters: antennae dark; hind femur with broad patch of dark pig-ment covering half of the segment; abdomen with basal pale yellow bands on tergites 2–4, tergites 1 and 5–7dark brown and wing length 3.84. The specific aedeagus characteristics were not adequately described for theeight named New World species. Papp (2005) commented that the male genitalia characteristics are importantin taxonomy.
Male. General body coloration dark, length ca. 5.0; head dichoptic, eye facets of equal sizeand with interfacetal pubescence. Median ocellus present. Proboscis longer than hind femur. Palpus length ca.1.76, as long as labellum. Antennae dark, length 1.2, or 1.3X the head height, with 14 unicolorous flagellom-eres, each longer than wide and with distinct reticulations, and scattered seta-like sensilla, flagellum length1.10; apical flagellomere length 0.13. Thorax dark, scutum slightly convex, sparsely covered with short setae; scutellum with 8 setae;mediotergite bare; supra-alar and notopleural setae 10–12; anterior pronotum and episternum setose; anepis-ternum bare; katepisternum with ventral margin slightly curved, laterotergite lobe-like posteroventrally with17 setae; metepisternum with membranous aspect, delimited by a sclerotized line. All coxae dark with sparsesetae; length 0.78, 0.64, and 0.50, respectively; fore and midleg femora and tibiae pale yellow, but femoravery faint pigmented sub-basally; hind femur with basal half pale yellow, apical half dark brown,length 1.8; hind tibia with basal half pale yellow, and apical half dark brown, length 2.72; femur/tibia propor-tion: 0.6; tarsomeres brown, length I–V: 1.46, 0.69, 0.51, 0.38, 0.25; tibial spurs formula 1:1:2; hind tibialspurs microtrichose, subequal in size, inner spur 1.4X the size of outer; tibial setulae in palisade rows; tarsalclaws of fore and mid legs curved, with diminutive projection basally, sharply curved with tip arched; hindtarsal claws length 0.012, slightly curved at apex, with sharp tip; empodia present. Wing length3.84, width 1.48; membrane densely covered with microtrichiae on whole surface, with apical darker spot sit-uated at junction of veins R5 and C; Sc joining C, h not oblique; R1 setose, as long as ca. 0.46X the length ofwing; R5 setose except the basal portion; C ending midway between apices of R5 and M1; Rs absent; only api-cal third of veins M1 and M2 present; length of M1 1.4, M2 1.3; CuA1 and CuA2 not connected in distal fork,length of CuA1 1.2; CuA2 straight but somewhat curved at the level where CuA1 begins; CuP very close andparallel to stem of CuA2; anal lobe well developed. Halter yellow. Abdomen with basal pale yellow bands on tergites 2–4, tergites 1 and 5–7 and genitalia dark brown; abdo-men length ca. 4.8, length of abdomen in relation to wing 0.85; sternite 8 rounded at apex. Genitalia: tergite 9 length 0.29, longer than wide, with rounded apical margin provided of aggregation ofthickened setae, with long apodeme; gonocoxite stout, 1.5X longer than broad; gonostylus with basolateralapophysis, a basomesal impression and a long seta at base and in the middle, with an apical tooth and dense setae; length 0.22; aedeagal complex membranous and rounded, with apparent lateral parameres,slightly more sclerotized that the body of the aedeagus; medial portion with hyaline projections; distal portionrounded; length 0.12, width 0.10. Cercus setose.
Female. Unknown.
Lygistorrhina borkenti is known only from the National Park “Lagunas de Zempoala”. Inthis place the altitude varies between 1,250 and 3,450 meters above sea level, and has several types of vegeta-tion, the most representatives being Pinus, Abies and Quercus forests. Specimens were collected with an aerialnet at the lake margin.