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Classification
Lygistorrhina alexi Huerta & Inabes-Bernal, 2008
Lygistorrhina alexi (after Huerta & Ibáñez-Bernal, 2008)
Diagnostic description:Abdomen of male with basal pale yellow bands on tergites 1–5, last two segments and genita-lia dark brown; antennae pale brown; flagellum length 0.74; fore coxa pale yellow, mid and hind coxae red-dish brown; hind femur pale yellow with apical 0.40 reddish brown; wing length 2.5; aedeagal complexmembranous with distal portion pointed laterally and medially rounded, parameres with pointed tip.
Look alikes:Lygistorrhina alexi differs from previously described species by the following characteristics:abdomen with basal pale bands on tergites 1–5 and the last two segments and genitalia dark brown; hindfemur with apical 0.40 reddish brown, and male with the paramere slender and pointed apex, although formany species this characteristic they are not described. The wing of the Costa Rican species mentioned byGrimaldi & Blagoderov (2001) is smaller than in L. alexi and does not have an aggregation of thickened setaeat the apex of male tergite 9. The differences between L. alexi and L. borkenti are the wing infuscation at apex,color of the hind femur, abdominal segment coloration, and aedeagus morphology. Another similar species isL. urichi, but it has the antennae black, thorax uniformly shining black, fore coxa with the base fuscous andthe apex yellowish, halter yellow, and abdomen with apical pale yellow bands.
Morphology:Male. General body coloration reddish brown, length ca. 5.0; head dichoptic, eye facets ofequal size and with interfacetal pubescence. Median ocellus present. Proboscis longer than hind femur. Palpuslength 1.1, as long as labellum. Antennae length 0.88, about 1.5X the head height, with 14 flagellomeres, all uniformly pale brown, each flagellomere longer than wide and with distinct reticulation, and scatteredseta-like sensilla; flagellum length 0.74, last flagellomere length 0.073.
Thorax reddish brown, scutum slightly convex, sparsely covered with short setae; scutellum with8 setae; mediotergite bare; supra-alar and notopleural setae 6–8; anterior pronotum and episternum setose;anepisternum bare; katepisternum with ventral margin evenly curved; laterotergite lobulate posteroventrally,and with 21–22 setae; metepisternum with membranous aspect, delimited by a sclerotized line. Fore coxa paleyellow, mid and hind coxae reddish brown, length 0.65, 0.52, and 0.41, respectively; all coxae with sparsesetae; fore and midleg femora and tibiae pale yellow; hind femur pale yellow, apical 0.40 reddishbrown, length 1.48; hind tibia pale yellow with apical 0.25 reddish brown, length 2.07; femur/tibia proportion:0.7; tarsomeres brown, length I–V: 1.16, 0.51, 0.38, 0.29, 0.23; tibial spurs formula 1:1:2; hind tibial spurssubequal, microtrichose, inner spur 1.5X the length of outer spur; tibial setulae in palisade rows; tarsal claws of fore and mid legs curved, with diminutive basal projection, sharply curved with strong arched tip;hind claws length 0.04, slightly curved at apex, with sharp tip; empodia present.
Wing (Figs. 3, 4, 6) length2.5, width 1.10; wing membrane densely covered with microtrichia on whole surface; wing infuscate at apex,darker spot situated at the union of R5 with C, continuing as a faintly infuscation toward vein M1 and reachingthe terminal portion of M2; Sc joining C, h not oblique; R1 long and setose, length ca. 0.46X the length ofwing; R5 setose except at base; C ending between apices of R5 and M1; Rs absent; only apical third of veins M1and M2 present, length of M1 0.89, M2 0.79; CuA1 and CuA2 not connected in distal fork, CuA1 length 0.82;CuA2 straight but somewhat curved at the level where CuA1 begins; CuP very close and parallel to stem of CuA2; anal lobe well developed. Halter white.
Abdomen with basal pale yellow bands on tergites 1–5, more evident on tergites 2–4; last two segmentsand genitalia dark brown; abdomen length ca. 3.0, length of abdomen in relation to wing length 0.75; sternite8 rounded at apex. Genitalia: tergite 9 longer than wide, length 0.24, with the posterior marginrounded and provided with a patch of thickened setae, apodeme long; gonocoxite stout, 1.5X as long as broad;gonostylus with a basolateral apophysis, a basomesal impression, long setae at base, and a tooth and numeroussetae at apex, length 0.18. Aedeagal complex membranous, length 0.11, width 0.10, distal portion pointed lat-erally, medially rounded; parameres curved, slender with pointed tip. Cercus setose.
Female. Similar to male, but differs as follows: Body length ca. 3.0; flagellum length 0.59; winglength 2.43; width 0.92; abdomen dark brown; sphermathecae oval, slightly different in size,the larger one length 0.070, width 0.058, the smaller length 0.068, width 0.058.
Lygistorrhina alexi
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