Lachesilla waterhousi n. sp.

(Figs 62–67)

Diagnosis. Hypandrium wide, with a setal field on each side and a deep concavity posteriorly in the middle, between the posterior processes, these proximally wide, narrowing distally, acuminate. Phallosome V-shaped anteriorly, apodemes proximally slender, wide distally, with a pointed apophysis on outer, postero-lateral corner, directed outward. Subgenital plate broad, of trapeziform profile, flap wide, short, sides parallel, antero-lateral corners projected outward. Gonapophyses short, stout, distally rounded. Ninth sternum wide, anterior half slightly pigmented, spermapore with pigmented rim, located on posterior half.

Description. Male. Color (10–49 years in 80% ethanol). Body pale brown. Compound eyes black, ocelli hyaline, without pigmented centripetal crescents. Wings hyaline, veins brown, R1 and stigmasaum ochre. Abdomen whitish, with brown subcuticular rings, faded ventrally.

Morphology. As in diagnosis, plus the following: Compound eyes slightly below the level of the vertex. Forewing pterostigma long, wider distally, Rs-M fused for a short distance, areola postica wide, rounded apically (Fig. 62). Hypandrium and phallosome (Fig. 64). Paraprocts (Fig. 66) broad, rounded, prong curved, distally truncate, sensory fields with 10 trichobothria. Epiproct (Fig. 66), slightly concave anteriorly, posteriorly bilobed, with setae on each lobe as illustrated.

Measurements. FW: 1964, HW: 1467, F: 385, T: 769, t1: 261, t2: 95, ctt1: 16, Mx4: 93, f1: 230, f2: 195, f3: 149, f4: 129, f5: 89, f6: 82, f7: 66, IO: 317, D: 158, d: 88, IO/d: 3.6, PO: 0.55.

Female. Color (44–49 years in 80% ethanol). Same as in the male.

Morphology. As in diagnosis, plus the following: Subgenital plate (Fig. 65), straight posteriorly, setae as illustrated, flap (Fig. 65). Gonapophyses and ninth sternum (Fig. 63). Paraprocts (Fig. 67), broadly elliptic, setal field as illustrated, sensory fields with 10 trichobothria. Epiproct (Fig. 67), straight anteriorly, rounded posteriorly, setae as illustrated.

Measurements. FW: 1894, HW: 1462, F: 379, T: 693, t1: 231, t2: 92, ctt1: 14, f1: 195: f2: 146, f3: 125, f4: 101, f5: 65, f6: 68, f7: 57, f8: 62, IO: 332, D: 150, d: 92, 3.6, PO: 0.61.

Specimens studied. Holotype male. GUATEMALA. 41.6 km. N El Rancho, rd. to Cobán . 29.viii.1968. Beating Pinus foliage and branches. E. L. Mockford & A. N. García Aldrete. 4 paratypes female. Same data as the holotype (ISU) . 1 female (non-paratype), 4 km. NW Chimaltenango . 29.viii.1973. Beating shrubs with dead leaves. A. N. García Aldrete. 1 male (non-paratype). MEXICO . Chiapas. Pueblo Nuevo. Soluchistán. Rincón Chamula, 1760 m. 17º11’40”N : 92º55’27”W. Beating Pinus foliage. L. Cervantes.

Etymology. This species honors the memory of Charles O. Waterhouse, co-author of the Insecta. Coleoptera . Serricornia. Volume III, Part 1 (1882–1897), of the Biologia Centrali-Americana.

Remarks. This species is close to L. horni n. sp., and to L. jacobyi n. sp., described above. It differs from them in the stout, acuminate posterior processes of the hypandrium, and in details of the distal thirds of the phallosome apodemes.