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Ferrisia multiformis sp. n. is described from Argentina, on Parthenium sp. A key is given to separate it from virgata and meridionalis also present in Argentina.

Se redescriben e ilustran 14 especies neotropicales incluidas en Mesolecanium Cockerell (Hemiptera: Coccidae). Ocho especies: Mesolecanium baccharidis (Cockerell), Mesolecanium impar (Cockerell), Mesolecanium mayteni (Hempel), Mesolecanium nocturnum (Cockerell y Parrott), Mesolecanium obscurum Hempel, Mesolecanium obvius Granara de Willink, Mesolecanium perditum (Cockerell), Mesolecanium planum Hempel, pertenecen a este género, las cuales se incluyen en una clave para separar las mismas. Cinco especies son transferidas: Mesolecanium campomanesiae (Hempel) y Mesolecanium pseudosemen (Cockerell), se transfieren a Magnococcus Granara de Willink como Magnococcus campomanesiae (Hempel) comb. nov. Magnococcus pseudosemen (Cockerell) comb. nov. respectivamente; Mesolecanium jaboticabae (Hempel) se transfiere a Parthenolecanium Šulc, como Parthenolecanium jaboticabae (Hempel) comb. nov.; Mesolecanium batatae (Cockerell) a Pulvinaria Targioni Tozzetti como, Pulvinaria batatae (Cockerell) comb. nov. y Mesolecanium ferum Hempel a Toumeyella Cockerell como Toumeyella ferum (Hempel) comb. nov. Se sinonimisa a Mesolecanium uvicola Hempel con Coccus longulus (Douglas). Se designan los lectotipos de Mesolecanium impar (Cockerell) y Mesolecanium planum Hempel.

We treat 50 species of Pseudococcus Westwood (Hemiptera: Pseudococcidae) found in Central and South America. Sixteen new species are described and illustrated: Pseudococcus acaena Granara de Willink n. sp., P. bahiensis Granara de Willink n. sp., P. calchaquii Granara de Willink n. sp., P. chaquensis Granara de Willink n. sp., P. colombiensis Granara de Willink n. sp., P. cubaensis Granara de Willink n. sp., P. cuyoensis Granara de Willink n. sp., P. debilis Granara de Willink n. sp., P. dumetum Granara de Willink n. sp., P. insuetus Granara de Willink n. sp., P. lanatii Granara de Willink, n. sp., P. neuquenensis Granara de Willink n. sp., P. occultus Granara de Willink n. sp., P. panamaensis Granara de Willink n. sp., P. salazari Granara de Willink n. sp. and P. scatoterrae Granara de Willink n. sp. The new species are distributed in Argentina (9 spp.), Colombia (3 spp.), Brazil (2), Uruguay (2), Cuba (1), Panama (1) and Peru (1). Diagnostic characters and illustrations of 34 additional species are provided: Pseudococcus agavis McGregor, P. apomicrocirculus Gimpel and Miller, P. calceolariae (Maskell), P. comstocki (Kuwana), P. cribata González, P. cryptus Hempel, P. donrileyi Gimpel and Miller, P. elisae Borchsenius, P. eriocereus Williams, P. espeletiae Williams and Granara de Willink, P. galapagoensis Morrison, P. importatus McKenzie, P. insularis Morrison, P. jackbeardsleyi Gimpel and Miller, P. landoi (Balachowsky), P. longispinus (Targioni Tozzetti), P. mandio Williams, P. maritimus (Ehrhorn), P. meridionalis Prado, P. microcirculus McKenzie, P. nakaharai Gimpel and Miller, P. neomicrocirculus Gimpel and Miller, P. odermatti Miller and Williams, P. pabulum Granara de Willink, P. peregrinabundus Borchsenius, P. puertoricensis Gimpel and Miller, P. rosangelae Pacheco da Silva and Kaydan, P. saccharicola Takahashi, P. schusteri Gimpel and Miller, P. spanocera Gimpel and Miller, P. sociabilis Hambleton, P. solenedyos Gimpel and Miller, P. sorghiellus (Forbes) and P. viburni (Signoret). Five species from Argentina, two species from Jamaica and one species from Suriname are cited for the first time. Sixty-three figures, corresponding to the known species, their variations and new species cited for the region are included. A list of host plants containing 77 plant families and 355 species is included. An updated list of host plants and the distribution of some species of the genus is provided.