New South American Lachesilla (Psocoptera: Lachesillidae) | New South American Lachesilla (Psocoptera: Lachesillidae)

English. Seven South American species of the psocid genus Lachesilla are here described and illustrated: L. brasiliensis n.sp. and L. carioca n.sp. (from Brazil, pedicularia group), are c10sely related, differing in the pattern of pigmentation of the ninth sternum, shape of the subgenital plate, and fore wing venation: shape of pterostigma and areola postica, and Rs-M connected by a crossvein in the former, and fused for a length in the latter; L. guayaquilensis n.sp. (from Ecuador, riegeli group) is c10se to L. castroi Thornton & Woo, from which it differs in genital details of both sexes; L. mattogrossensis n.sp. (from Brazil, is tentatively placed in the riegeli group, differing from aH other described species in the group by the subgenital plate, the large gonapophyses and the anterior projections of the ninth sternum; L. picticepsoides n.sp. (from Ecuador, corona group) is close to the Mexican L. picticeps Mockford, from which it differs in the distal apophyses of the claspers, the mesal projections of the epiproct (absent in L. picticeps), the anterior margin of the ninth sternum, and in the shape of the flap of the subgenital plate (triangular in L. picticepsoides and rectangular in L. picticeps); L. teresiana n.sp. (from Brazil, pedicularia group) is close to L. nuptialis Badonnel & García Aldrete, from which it differs in the shape of the subgenital plate and gonapophyses; L. veneper n.sp. (from Venezuela and Perú, pedicularia group), is close to the Venezuelan L. trujillense García Aldrete, from which it differs in fore wing venation and pigmentation, and in the length of the epiproct extensions, stouter, shorter and without distal teeth in L. veneper. The types are deposited in the American Museum of Natural History, New York City

Spanish; Castilian. Se describen e ilustran en este trabajo a siete especies sudamericanas del género Lachesilla (Psocoptera): 1. brasiliensis n.sp., y 1. carioca n. sp. (de Brasil, grupo pedicularia) son cercanas una a otra, y difieren en el patrón de pigmentación del noveno estemíto, en la forma de la placa subgenital y en la venación del ala anterior: forma del pterostigma y de la areola postica; Rs-M conectadas por una vena transversal en L. brasiliensis y fusionadas en un tramo en L carioca; L guayaquilensis n.sp. (de Ecuador, grupo riegeli) es cercana a L castroi Thomton & Woo, de la que se distingue por detalles genitales de ambos sexos; L mattogrossensis n.sp. (de Brasil) es tentativamente situada en el grupo riegeli, separándose de todas las especies descritas en el grupo por la forma de la placa subgenital, las grandes gonapófises y las proyecciones anteriores del noveno estemito; 1. picticepsoides n. sp. (de Ecuador, grupo corona) es cercana a 1. picticeps Mockford, de México, de la que difiere en las apófises distales de los c l ásperes, l a s proyecciones mesiales del epiprocto (ausentes en L. pict