Lachesilla furthi Aldrete & Casasola-González 2021, n. sp.

Lachesilla furthi n. sp.

(Figs 6−9)

Diagnosis. Mesal flap of the subgenital plate mid-sized, with anterior border extended laterally, body of the flap narrowing posteriorly, the distal concavity about one third the length of the flap. Gonapophyses long, sides almost parallel, distally blunt. Spermapore in the center of the ninth sternum, this anteriorly with three, approximately triangular short processes in the middle. Although much shorter, the flap of the subgenital plate, on account of the anterior side extension, is reminiscent to those of L. gurneyi García Aldrete, from Durango, Hidalgo and Mexico City, and to L. salamana García Aldrete, from Guatemala.

Female. Color (in 80% ethanol). Body tawny brown. Compound eyes black, ocelli hyaline, with pale brown centripetal crescents. Maxillary palps dark brown, antennae and legs pale brown. Wings hyaline, veins brown. Tergal lobes of meso- and metathorax slightly more pigmented. Abdomen with pale brown, transverse subcuticular bands.

Morphology. Compound eyes below the level of the vertex. Forewing pterostigma wider posteriorly, Rs and M diverging from a point, areola postica wide, broadly triangular (Fig. 6). Hindwing as in Fig. 6. Subgenital plate (Fig. 9) straight anteriorly, posterior border straight, posterior third glabrous, setae as illustrated, mesal flap (Fig. 9) as described in Diagnosis. Gonapophyses and ninth sternum (Fig. 8). Paraprocts (Fig. 7) semicircular, setose as illustrated, sensory fields rounded, with 9−10 trichobothria in basal rosettes, and one marginal trichobothrium without basal rosette. Epiproct (Fig. 7) trapeziform, setae on posterior half.

Measurements. FW: 1956, HW: 1562, F: 354, T: 686, t1: 186, t2: 107, ctt1: 12, f1: 348, f2: 161, f3: 128, f4: 87, f5: 58, f6: 54, f7: 39, f8: 87, IO: 266, D: 150, d: 100, IO/d: 2.66, PO: 0.66.

Specimens studied. Holotype female, MEXICO, Chihuahua, Sierra Tarahumara, Basaseachic waterfall, 28º10.623’N: 108º12.79’W, 870m, 20.IX.2002, Beating dead branches with lichens, J. A. Casasola González.

Records. MEXICO, Chihuahua, Sierra Tarahumara, Cusárare waterfall, 21 km SE Creel, 27º37’27’’N: 107º33’58’’W, 2080 m, 16.VI.2002, Beating Cupressus branches with dead leaves, 1 female, A. N. García Aldrete; Hwy. Creel-Guachochi, rd. to El Tejabán, 27º35.414’N: 107º32.742’W, 2140 m, 15.XI.2002, Beating Juniperus foliage, 1 female, J. A. Casasola González.

Etymology. This species is dedicated to Dr. David G. Furth, formerly of the Smithsonian Institution National Museum of Natural History (Washington, D.C.), in recognition of his important studies on Alticinae (Chrysomelidae), particularly on the diversity of the Sierra Tarahumara Copper Canyon (Research on Chrysomelidae, Vol. 2, pp. 131−151, Koninklijke Brill, Leiden 2009).