Lachesilla gorhami n. sp.

(Figs 34–39)

Diagnosis. Hypandrium wide, deeply concave posteriorly, posterior processes lateral, proximally wide, narrowing distally, curved outward, acuminate. Subgenital plate rounded posteriorly, flap wide, pentagonal, bearing anteriorly two macrosetae near the border. Gonapophyses wide proximally, narrowing distally, with a pigmented band along outer border, projected proximally. Ninth sternum wider in the middle, with a pigmented area anteriorly, spermapore located posteriorly.

Description. Male. Color (10–44 years in 80% ethanol). Body reddish brown. Compound eyes black, ocelli hyaline, without pigmented centripetal crescents. Maxillary palps brown. Antennae and legs pale brown. Wings hyaline, veins pale brown. Abdomen whitish, with brown subcuticular rings faded ventrally.

Morphology. As in diagnosis, plus the following: Forewings pterostigma long, wider distally, Rs-M meeting at a point, areola postica broadly triangular, rounded apically (Fig. 34). Hypandrium (Fig. 38), with one setal field on each side. Phallosome (Fig. 38), V-shaped anteriorly, each apodeme long, slender, with distal third dilated, glabrous, acuminate. Paraprocts (Fig. 39) broad, prong long, curved, distally truncate, sensory fields with 11 trichobothria; anterior inner border, limiting sensory field pigmented. Epiproct (Fig. 39) slightly concave anteriorly, bilobed posteriorly, with setae as illustrated.

Measurements. FW: 2291, HW: 1722, F: 453, T: 835, t1: 281, t2: 105, ctt1: 13, Mx4: 107, f1: 244, f2: 236, f3: 188, f4: 149, f5: 90, f6: 87, f7: 75, IO: 313, D: 178, d: 107, IO/d: 2.92, PO: 0.60.

Female. Color (10–44 years in 80% ethanol). Same as in the male.

Morphology. As in diagnosis, plus the following: Subgenital plate wide, setose (Fig. 36), flap distally unpigmented. Gonapophyses and ninth sternum (Fig. 35). Paraprocts (Fig. 37), elongate, anteriorly straight, rounded posteriorly, setae as illustrated, sensory fields with 11 trichobothria. Epiproct (Fig. 37), trapeziform, setae as illustrated.

Measurements. FW: 2102, HW: 1621, F: 438, T: 826, t1: 276, t2: 97, ctt1: 13, Mx4: 104, f1: 243, f2: 193, f3: 151, f4: 107, f5: 71, f6: 61, f7: 62, IO: 316, D: 157, d: 94, IO/d: 3.36, PO: 0.59.

Specimens studied. Holotype male, 1 paratype female. GUATEMALA. 4 km SE Patzún. 29.viii.1973. Beating Pinus branches with dead leaves. A. N. García Aldrete. 3 paratypes male, 1 paratype female. MEXICO. Chiapas. Lagunas de Montebello, 60 km SE Comitán, 1580 m. 11.viii.1975. Beating branches with dead leaves of Quercus and Liquidambar . A. N. García Aldrete & B. García González. 2 paratypes male. MEXICO. Chiapas. Km 21, Altamirano-San Cristóbal de las Casas, 1938 m. 20.iii.2007, 16º48’07”N: 92º19’25”W. Beating vegetation, G. Ortega, C. Mayorga & L. Cervantes (CNIN).

Etymology. This species is dedicated, in memoriam, to Henry Stephen Gorham, author of the Insecta. Coleoptera . Malacodermata. Volume III, Part 2 (1880–1886), and Insecta. Coleoptera . Erotylidae . Endomychidae and Coccinellidae . Volume VIII (1887–1899), of the Biologia Centrali-Americana.

Remarks. This species differs from L. contrerasi García Aldrete (2015 b), L. curviforceps García Aldrete (1974 c), L. godmani n. sp., and L. lachataoensis García Aldrete & Casasola (2012) (see under Remarks of L. godmani n. sp., above), in having the posterior processes of the hypandrium wide based, distally curved outward and acuminate, with the phallosome V-shaped anteriorly, with apodemes slender, dilated in distal thirds, pointed. The flap of the subgenital plate and the gonapophyses and ninth sternum are rather different from the other species in the group.