Lachesilla corbalanae García Aldrete

(Figs. 13–15)

Diagnosis. Belonging in species group patzunensis (García Aldrete 1986). Projections of the distal piece of hypandrium longer and broader than in L. andina . Sclerotized projected area at the bottom of the concavity of the distal piece of hypandrium more robust and with side arms broader and longer than in L. andina .

Male. Color. Body brown. Compound eyes black, ocelli hyaline, with ochre centripetal crescents. Antennae and maxillary palps dark brown, legs brown, wings opaque, fumose. Abdomen creamy white, with ochre subcuticular rings.

Morphology. Forewing pterostigma wider posteriorly, Rs-M diverging from a point, areola postica rounded apically (Fig. 13). Hindwing Rs-M fused for a distance (Fig. 13). Hypandrium of two pieces (Fig. 14), the distal one deeply concave posteriorly, almost straight anteriorly, each half with a broad based projection, blunt ended, inner edge straight and outer edge curved; a robust sclerotized projection at the bottom of the concavity, with two side arms and a short stem (Fig. 14). Paraprocts (Fig. 15) broad, setose, with a mesal, strongly sclerotized truncate prong, sensory fields with 11–12 trichobothria on basal rosettes, and a marginal one without basal rosette. Epiproct (Fig. 15) broad, deeply bilobed posteriorly, almost straight anteriorly, each lobe rounded, with a field of setae on distal half.

Measurements. FW: 1911, HW: 1479, F: 380, T: 720, t1: 221, t2: 100, ctt1: 16, Mx4: 98, f1: 199, f2: 175, f3: 153, f4: 132, IO: 318, D: 143, d: 95, IO/D: 2.22, PO: 0.66.

Material studied. ARGENTINA, Buenos Aires, El Tigre, Río Sarmiento, Tres Bocas, 1 male, 26.VIII.2008, beating shrubs and trees, A. N. García Aldrete (CNIN).

Remarks. The male described above was collected at the same locality as that where the female of L. corbalanae García Aldrete had been collected almost five years earlier (García Aldrete 2004). It is considered conspecific on the grounds of belonging in the same species group, and on presenting the same body color and wing venation as the female holotype. This species holds a sister group relationship with L. andina n. sp., described above, on the basis of the similarities in the genitalia of both species (see Figs. 7–15 in this paper, and Figs. 6–10 in García Aldrete 2004). Male-female associations in the quite large genus Lachesilla must be established, first, on males and females belonging in the same species group, and second, on basis of shared characters such as head and wing pattern (if any), and wing venation, particularly shape of the pterostigma and areola postica in the forewing, nature of the junction of veins Rs and M in both wings, and presence of crossveins in both wings.