Lachesilla walsinghami, García Aldrete, 2017

García Aldrete, Alfonso N., 2017, New species of Lachesilla (Psocodea: Psocomorpha: Lachesillidae), in species group corona, from southern Mexico and Central America, Zootaxa 4347 (2), pp. 201-227 : 222

Lachesilla walsinghami n. sp. Female

( Figs 57–61 )

Diagnosis. Subgenital plate wide, straight posteriorly, flap narrow anteriorly, about 1.5 times as long as wide, posteriorly rounded. Gonapophyses slightly constricted proximally, wider in the middle, distally pointed, proximal and outer borders sclerotized, the latter projected towards the clunium. Ninth sternum with a pigmented band anteriorly and a pigmented arch posteriorly.

Description. Color (29–49 years in 80% ethanol). Body reddish brown. Compound eyes black, ocelli hyaline, with ochre centripetal crescents ( Fig. 60 ). Wings hyaline, veins brown, R1 and stigmasaum ochre. Abdomen whitish, with brown subcuticular rings, faded ventrally.

Morphology. As in diagnosis, plus the following: Forewing pterostigma much wider distally, Rs-M meeting at a point, areola postica tall, narrow, apically rounded ( Fig. 57 ). Subgenital plate ( Fig. 58 ), with setae as illustrated. Gonapophyses and ninth sternum ( Fig. 59 ), gonapophyses with a field of 6–7 setae as illustrated. Paraprocts ( Fig. 61 ), broad, rounded, setae as illustrated, sensory fields with 10 trichobothria. Epiproct trapeziform ( Fig. 61 ), with setal field on posterior half.

Measurements. FW: 2223, HW: 1719, F: 352, T: 859, t1: 288, t2: 112, ctt1: 14, Mx4: 103, f1: 227, f2: 216, f3: 166, f4: 147, f5: 98, f6: 90, IO: 349, D: 191, d: 115, IO/d: 3.03, PO: 0.60.

Specimens studied. Holotype female. MEXICO . Chiapas. Km. 15, rd. Buenos Aires-Siltepec , 2500 m. 8.vii.1988. Beating vegetation. L. Cervantes, A. Cadena. 3 paratypes female. Same data as the holotype ( CNIN) . 1 paratype female. GUATEMALA . 38 km. N Huehuetenango, Hwy. 9. 3.ix.1968. E. L. Mockford ( ISU) .

Etymology. This species is dedicated, in memoriam, to Lord Walsingham, author of the Insecta. Lepidoptera. Heterocera. Volume IV (1909–1915), of the Biologia Centrali-Americana.

Remarks. The gonapophyses of this species are reminiscent to those of the Canadian L. albertina García Aldrete (1992) , and the Guatemalan-Mexican L. gorhami n. sp., described above. It differs from them in the ninth sternum and in the subgenital plate and flap.

Figures

FIGURES 57 – 61. Lachesilla walsinghami n. sp. Female. 57. Fore- and hind- wings. 58. Subgenital plate. 59. Gonapophyses and ninth sternum. 60. Front view of head. 61. Epiproct and right paraproct. Scales in mm.