Lachesilla drucei, 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 : 208-211

Lachesilla drucei n. sp.

( Figs 21–26 )

Diagnosis. Hypandrium broad, subquadrate, with a setal field on each side, posterior processes in the middle, slender, elongate, distally acuminate. Phallosome V-shaped anteriorly, arms slender, elongate, distally dilated, ending in two pointed apophyses. Subgenital plate projected posteriorly, projection straight distally, obtusely convex anteriorly. Gonapophyses long, narrowing distally, with a small apical projection. Ninth sternum elliptic, with a pigmented band anteriorly, concave posteriorly in the middle.

Description. Male. Color (10 years in 80% ethanol). Body tawny brown. Compound eyes black, ocelli hyaline, with ochre centripetal crescents. Tergal lobes of meso- and metathorax more pigmented. Abdomen whitish, with pale brown subcuticular rings, faded ventrally.

Morphology. As in diagnosis plus the following: Pterostigma narrow anteriorly, rounded, wide distally. Rs-M meeting at a point, areola postica broadly triangular, rounded apically ( Fig. 21 ). Hypandrium and phallosome ( Fig. 23 ). Paraprocts ( Fig. 25 ) rounded, with a macrosetae near sensory fields, other setae as illustrated; a sclerotized band anteriorly, limiting sensory fields, the sensory fields with 11 trichobothria. Mesal prong stout, curved, distally truncate. Epiproct ( Fig. 25 ) wide, anteriorly straight, posteriorly bilobed, with a setal field on each lobe, a mesal protuberance on each side of longitudinal midline.

Measurements. FW: 1810, HW: 1424, F: 360, T: 694, t1: 206, t2: 96, ctt1: 12, Mx4: 91, f1: 288, f2: 233, IO: 309, D: 149, d: 100, IO/d: 3.09, PO: 0.67.

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

Morphology. As in diagnosis plus the following: Wings as in the male. Subgenital plate wide, setae as illustrated ( Fig. 24 ). Gonapophyses ( Fig. 22 ). Ninth sternum ( Fig. 22 ) with a narrow pigmented band along posterior border, and a broad pigmented band anteriorly, as in diagnosis; spermapore centrally located, with a pigmented rim. Paraprocts ( Fig. 25 ) broadly elliptic, setae as illustrated, sensory fields with 9–10 trichobothria. Epiproct ( Fig. 26 ) trapeziform, slightly concave anteriorly, setae as illustrated.

Measurements. FW: 1912, HW: 1484, F: 495, T: 702, t1: 217, t2: 106, ctt1: 15, Mx4: 106, IO: 347, D: 187, d: 90, IO/d: 3.85, PO: 0.48.

Specimens studied. Holotype male. MEXICO . Chiapas. Pueblo Nuevo. Soluchistán. Rincón Chamula, 1760 m. 17º11’40”N : 92º55’27” W. 26.vi.2007. L. Cervantes, C. Mayorga & G. Ortega. Paratypes: 2 males, 4 females, same data as the holotype .

Etymology. This species honors the memory of Herbert Druce, author of the Insecta. Lepidoptera. Heterocera. Volume I (1881–1900), Volume II (1891–1900) and Volume III (1881–1900), of the Biologia Centrali-Americana.

Remarks. This is one of three species in the group, in which the subgenital plate is projected posteriorly in the middle, instead of having a mesal flap; the other species are L. zuninoi García Aldrete , and L. zuninoides García Aldrete , from the Mexican states of Hidalgo and Veracruz, and from Guerrero, Hidalgo and Oaxaca, respectively. L. drucei clearly differs from them in the projection of the subgenital plate, and in the gonapophyses and ninth sternum (see García Aldrete, 2014). For characters of the male see diagnosis above.

Figures

FIGURES 21 – 26. Lachesilla drucei n. sp. 21. Fore- and hind- wings. Female. 22. Gonapophyses and ninth sternum. Female. 23. Hypandrium and phallosome. Male. 24. Subgenital plate. Female. 25. Epiproct and right paraproct. Male. 26. Left paraproct and epiproct. Female. Scales in mm.