Lachesilla raramuri n. sp.

(Figs 10−15)

Diagnosis. Distal halves of claspers curved, acuminate; phallosome apodemes independent, distally bent outward, acuminate. Mesal flap of the subgenital plate long, anteriorly slightly extended to each side, distal concavity about one eight the length of the flap. Gonapophyses mid-sized, with sides parallel, distally blunt. The bent outward ends of the phallosome apodemes resemble those of L. aspera García Aldrete, from Arizona, and L. chiricahua García Aldrete, also from Arizona.

Male. Color (in 80% ethanol). Body tawny brown. Compound eyes brown, ocelli hyaline, with ochre centripetal crescents. Maxillary palps and antennae brown, legs pale brown. Wings almost hyaline, veins pale 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, this straight. Forewing pterostigma wider posteriorly, Rs and M diverging from a point, areola postica wide, apically rounded. Hypandrium broad, setose as illustrated (Fig. 11), claspers lateral to hypandrium, distally curved, acuminate, phallosome apodemes as described in Diagnosis. Paraprocts (Fig. 12) semicircular, setae as illustrated, mesal prongs mid-sized, acuminate, sensory fields rounded, with 10−11 trichobothria in basal rosettes, and one marginal trichobotrium without basal rosette. Epiproct (Fig. 12) broadly trapeziform, setae as illustrated.

Measurements. FW: 1670, HW: 1282, F: 349, T: 649, t1: 220, t2: 86, ctt1: 14, Mx4: 101, f1: 242, f2: 185, f3: 174, f4: 138, f5: 97, f6: 90, f7: 78, f8: 81, f9: 68, f10: 70, f11: 75, IO: 287, D: 128, d: 100, IO/d: 2.87, PO: 0.78.

Female. Color. Same as in the male.

Morphology. Compound eyes below the level of the vertex. Fore- and hind- wings as in Fig. 10. Subgenital plate (Fig. 15) anteriorly straight, posteriorly rounded, setae as illustrated, posterior half glabrous. Mesal flap long, setose, anterior border slightly convex, extended to each side, distal concavity small (Fig. 15). Gonapophyses, spermapore and ninth sternum as in Fig. 13. Paraprocts (Fig. 14), setose as illustrated, sensory fields elliptic, with 11-12 trichobothria in basal rosettes, and one marginal trichobothrium without basal rosette. Epiproct (Fig. 14) trapeziform, with setal field on posterior half.

Measurements. FW: 1799, HW: 1420, F: 426, T: 746, t1: 233, t2: 88, ctt1: 12, Mx4: 79, f1: 242, f2: 190, f3: 156, f4: 120, f5: 90, f6: 89, f7: 77, f8: 76, f9: 54, f10: 74, f11: 73, IO: 338, D: 139, d: 105, IO/d: 3.21, PO: 0.75.

Specimens studied. Holotype male, MEXICO, Chihuahua, Sierra Tarahumara, 5 Km, NW junction to Maguarichi, road Cajurichic-San Juanito, 28º02’35’’N: 107º49’39’’W, 2390 m, 15.VI.2002, Beating dead branches of Cupressus, A. N. García Aldrete & J. A. Casasola González, 1 male, 1 female paratypes, same data as the holotype.

Records. MEXICO, Chihuahua, Sierra Tarahumara, Cusárare waterfall, 21 Km SE Creel, 27º37’27’’N: 107º35’58’’W, 2080 m, 16.VI.2002, Beating branches with dead leaves of Cupressus, 1 male. A. N. García Aldrete & J. A. Casasola González; Guachochi waterfall, 26º49’08’’ N: 107º03’48’’W, 2279 m, 1 male, A. N. García Aldrete .

Etymology. This species is dedicated to the Rarámuri (or Tarahumara) ethnic group, “those of the winged feet”, that inhabit the Sierra Tarahumara, Chihuahua, Mexico.